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ISU 128

128 kbps ISDN Service Unit

USER MANUAL

Part Numbers

1202029L2 115 VAC

1202029L3 115 VAC with V.34 Modem Option

61202.029L2-1D January 1998

Trademarks:

DMS-100 is a trademark of Northern Telecom. ISU is trademark of ADTRAN, Incorporated.

Macintosh is a registered trademark of Apple Computer, Incorporated. Stac is a registered trademark and LZS is a trademark of Stac Electronics. Windows is a registered trademark of Microsoft Corporation.

5ESS is a registered trademark of AT&T.

Windows® 95 is a registered trademark of Microsoft Corporation. MNP® is a registered trademark of Microcom, Incorporated.

901 Explorer Boulevard

P.O. Box 140000

Huntsville, AL 35814-4000

Phone: (205) 963-8000

© 1998 ADTRAN, Inc.

All rights reserved.

Printed in USA.

FCC regulations require that the following information be provided to the customer in this manual.

1.If your telephone equipment ( ISU 128) causes harm to the telephone network, the telephone company may discontinue your service temporarily. If possible, they will notify you in advance. But if advance notice isn’t practical, you will be notified as soon as possible. You will be advised of your right to file a complaint with the FCC.

2.Your telephone company may make changes in its facilities, equipment, operations, or procedures that could affect the proper operation of your equipment. If they do, you will be given advance notice so as to give you an opportunity to maintain uninterrupted service.

3.If you experience trouble with this equipment ( ISU 128), please contact ADTRAN (see inside back cover) for repair/warranty information. The telephone company may ask you to disconnect this equipment from the network until the problem has been corrected, or until you are sure the equipment is not malfunctioning.

4.This unit contains no user-serviceable parts.

To ADTRAN service personnel: For continued protection against risk of fire, replace F1 with the same type and rating of fuse only: .2 A, 250 V.

FEDERAL COMMUNICATIONS COMMISSION

RADIO FREQUENCY INTERFERENCE STATEMENT

FCC ID: HDC1202029TL

This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential environment. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio or TV reception, which can be determined by turning the equipment off and on. The user is encouraged to try to correct the interference by one or more of the following measures:

Reorient or relocate the receiving antenna.

Increase the separation between the equipment and receiver.

Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.

Consult the dealer or an experienced radio/TV technician for help.

This device is FCC Class B certified only on the EIA-232 interface. The V.35 and RS-530 interfaces are FCC Class B verified.

Changes or modifications not expressly approved by ADTRAN will void the user’s authority to operate this equipment.

CANADIAN EMISSIONS REQUIREMENTS

This digital apparatus does not exceed the Class B limits for radio noise emissions from digital apparatus as set out in the interference-causing equipment standard entitled "Digital Apparatus," ICES-003 of the Department of Communications.

Cet appareil nuerique respecte les limites de bruits radioelectriques applicables aux appareils numeriques de Class B prescrites dans la norme sur le materiel brouilleur: "Appareils Numeriques," NMB-003 edictee par le ministre des Communications.

CANADIAN EQUIPMENT LIMITATIONS

Notice: The Canadian Industry and Science Canada label identifies certified equipment. This certification means that the equipment meets certain telecommunications network protective, operational, and safety requirements. The Department does not guarantee the equipment will operate to the user’s satisfaction.

Before installing this equipment, ensure that it is permissible to be connected to the facilities of the local telecommunications company. The equipment must also be installed using an acceptable method of connection. In some cases, the company’s inside wiring associated with a single-line individual service may be extended by means of a certified connector assembly (telephone extension cord). Compliance with the above conditions may not prevent degradation of service in some situations.

Repairs to certified equipment should be made by an authorized Canadian maintenance facility designated by the supplier. Any repairs or alterations made by the user to this equipment, or equipment malfunctions, may give the telecommunications company cause to request the user to disconnect the equipment.

Users should ensure for their own protection that the electrical ground connections of the power utility, telephone lines, and internal metallic water pipe system, if present, are connected together. This precaution may be particularly important in rural areas.

Users should not attempt to make such connections themselves, but should contact the appropriate electric inspection authority, or an electrician, as appropriate.

The Load Number (LN) assigned to each terminal device denotes the percentage of the total load to be connected to a telephone loop which is used by the device, to prevent overloading. The termination on a loop may consist of any combination of devices subject only to the requirement that the total of the Load Numbers of all devices does not exceed 100.

 

Table of Contents

Chapter 1. Understanding ISDN and the ISU 128 .....................................................

1

ISDN Overview ..................................................................................................................

 

1

The ADTRAN ISU 128.......................................................................................................

 

1

ISU 128 Interoperability ....................................................................................................

 

4

Recommended Operating Protocols................................................................................

 

6

Chapter 2. ISDN Ordering Codes (IOCs) .....................................................................

9

Ordering ISDN using IOCs...............................................................................................

 

9

Capability S ...................................................................................................................

......

10

Applications..........................................................................................................

 

10

Capability R..................................................................................................................

 

10

Applications..........................................................................................................

 

10

Capability B ..................................................................................................................

 

10

Capability C..................................................................................................................

 

10

Chapter 3. Installation.....................................................................................................

 

11

Network Connection..........................................................................................................

 

11

DTE Data Connection ........................................................................................................

 

12

Dial Interface Connection..................................................................................................

 

12

Maintenance Interface .......................................................................................................

 

13

Chapter 4. Operation .......................................................................................................

 

15

Menu Navigation ...............................................................................................................

 

15

Getting Started................................................................................................................

....

16

Status Buffer .................................................................................................................

 

16

VT 100 Terminal Menu Support ......................................................................................

 

17

Status Screen.................................................................................................................

 

17

Configuration Screen ..................................................................................................

 

18

Chapter 5. Testing ............................................................................................................

 

19

TEST Options ...................................................................................................................

...

19

Loopback DTE..............................................................................................................

 

20

Loopback Network......................................................................................................

 

20

Loopback Protocol.......................................................................................................

 

20

Loopback Remote ........................................................................................................

 

21

Test Remote ..................................................................................................................

 

21

Loopback Disable ........................................................................................................

 

21

No Remote Loopbacks..................................................................................

 

21

DDS Accepted................................................................................................

 

21

V.54 Accepted ................................................................................................

 

21

DDS+V54 Accept...........................................................................................

 

22

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ISU 128 User Manual

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Table of Contents

 

 

Near-End Block Errors/Far-End Block Errors (NEBE/FEBE)

.............................. 22

 

Software Version..........................................................................................................

22

Chapter 6. Configuration .................................................................................................

23

Dial Line Operation............................................................................................................

23

 

Switch Protocol ............................................................................................................

24

 

Call Type .......................................................................................................................

24

 

Speech ....................................................................................................................

24

 

Audio .....................................................................................................................

25

 

Data 56 kbps..........................................................................................................

25

 

Data 64 kbps (default) .........................................................................................

25

 

Terminal Identification ...............................................................................................

25

 

Setting the SPID....................................................................................................

25

 

Setting the LDN....................................................................................................

26

 

Dial Options..................................................................................................................

29

 

Front Panel ............................................................................................................

29

 

RS-366 ....................................................................................................................

29

 

1 sec or EON...................................................................................................

30

 

2 sec or EON...................................................................................................

30

 

5 sec or EON (default)...................................................................................

30

 

10 sec or EON.................................................................................................

30

 

20 sec or EON.................................................................................................

30

 

Wait for EON .................................................................................................

30

 

AT Commands .............................................................................................................

30

 

Using AT Commands ...................................................................................

31

 

Using S-Registers...........................................................................................

31

 

Reading S-Registers.......................................................................................

32

 

Reading S-Register Strings...........................................................................

32

 

Changing S-Registers....................................................................................

32

 

Changing S-Register Strings ........................................................................

32

 

Dialing a Call Using the AT Command Processor ...................................

32

 

V.25 bis ..........................................................................................................................

33

 

V.25 ASYNC Dialing.....................................................................................

34

 

V.25 SYNC HDLC Dialing ...........................................................................

35

 

V.25 SYNC BISYNC Dialing ......................................................................

35

 

V.25 HDLC FLAG..........................................................................................

35

 

Disabled.................................................................................................................

35

 

Auto Answer ................................................................................................................

36

 

Disabled.................................................................................................................

36

 

Enabled ..................................................................................................................

36

 

Dump all calls.......................................................................................................

36

 

Answer Tone ................................................................................................................

37

 

No Answer Tone (Default) .................................................................................

37

 

Incoming Tone......................................................................................................

37

 

Outgoing Tone......................................................................................................

37

 

Always Tone .........................................................................................................

37

 

Connect Timeout..........................................................................................................

38

 

Call Screening...............................................................................................................

38

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Table of Contents

Leased Line Service............................................................................................................

 

40

Clock Mode: Slave/Master .......................................................................................

 

40

Channel rate .................................................................................................................

 

41

DTE OPTIONS....................................................................................................................

 

42

Bit Rate .......................................................................................................................

 

... 42

Connector Type............................................................................................................

 

43

RTS Options..................................................................................................................

 

43

CTS Options .................................................................................................................

 

43

CD Options...................................................................................................................

 

43

DTR Options.................................................................................................................

 

43

DSR Options.................................................................................................................

 

44

Flow Control (Asynchronous Data Format)............................................................

44

Data Format (Asynchronous) ....................................................................................

 

45

Transmit Clock (Synchronous Data Format)...........................................................

45

Chapter 7. Protocol Options ............................................................................................

 

47

Protocol Options...............................................................................................................

 

.. 47

Clear Channel...............................................................................................................

 

48

BONDING Mode 1......................................................................................................

 

48

TXINIT ............................................................................................................

 

49

TXFA ...............................................................................................................

 

49

TXADD01 .......................................................................................................

 

50

TXDEQ............................................................................................................

 

50

TANULL.........................................................................................................

 

50

TCID ................................................................................................................

 

50

V.120 ..........................................................................................................................

 

.... 50

V.110 ..........................................................................................................................

 

.... 51

V.34 ...........................................................................................................................

 

..... 51

Error Control..................................................................................................

 

51

Compression ..................................................................................................

 

52

Microcom™ Network Protocol Block Size (MNP® Blk) .........................

52

DSU 57.6 ASYNC.........................................................................................................

 

53

T-Link .........................................................................................................................

 

... 53

Simple ADTRAN Protocol (SAP)..............................................................................

 

53

FALLBACK ..................................................................................................................

 

54

Point-to-Point (PPP) Async-to-Sync .........................................................................

56

Point-to-Point Protocol (PPP)

.............................................................................

56

Multilink Point-to-Point Protocol (MP) ............................................................

56

PPP with Compression .......................................................................................

 

57

Chapter 8. Quick Setup ....................................................................................................

 

59

Quick Setup Configuration...............................................................................................

 

59

Quick Setup ..................................................................................................................

 

60

Dial 56K sync* ......................................................................................................

 

60

Dial 64K sync* ......................................................................................................

 

61

Dial 112K sync* ....................................................................................................

 

61

Dial 128K sync* ....................................................................................................

 

62

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Table of Contents

 

 

Dial PPP* ...............................................................................................................

 

62

V34 115.2 async* ...................................................................................................

 

63

Dial 57.6 asyn* ......................................................................................................

 

63

Dial 115.2 asyn* ....................................................................................................

 

64

Fallback 57.6k*......................................................................................................

 

64

More .......................................................................................................................

 

65

Leased 128K....................................................................................................

 

65

Ldm 128 Master .............................................................................................

 

65

Factory Setup..................................................................................................

 

66

Chapter 9. Dial Options ...................................................................................................

 

67

Dialing Options................................................................................................................

 

... 67

Hang Up Line ...............................................................................................................

 

68

Dial Number.................................................................................................................

 

68

Redial Last Number ....................................................................................................

 

68

Answer Call ..................................................................................................................

 

68

Dial Stored Number ....................................................................................................

 

68

Store/Review Number ...............................................................................................

 

69

Chapter 10. Remote Configuration ................................................................................

 

71

Remote Configuration .......................................................................................................

 

71

Configuring with AT Commands .............................................................................

71

Configuring and Testing with the Front Panel or

 

VT 100 Terminal ............................................................................................

 

72

Configure Remote Unit...............................................................................................

 

73

Remote Testing.............................................................................................................

 

74

Loopback Remote 1B ...........................................................................................

 

74

Loopback Remote 2B ...........................................................................................

 

74

Set Password.........................................................................................................

 

74

Chapter 11. Troubleshooting...........................................................................................

 

77

If Self Test Fails .............................................................................................................

 

...... 77

If The ISU 128 Does Not READ READY.........................................................................

77

Chapter 12. Specifications ...............................................................................................

 

83

Specifications and Features...............................................................................................

 

83

Network Interface..........................................................................................

 

83

DTE Interface .................................................................................................

 

83

Dialing Selections ..........................................................................................

 

83

Data Rates (Network) ...................................................................................

 

83

Data Rates (DTE) ...........................................................................................

 

83

Rate Adaption ................................................................................................

 

84

Interoperability ..............................................................................................

 

84

Switch Compatibility ....................................................................................

 

84

B Channel Aggregation ................................................................................

 

84

Display ............................................................................................................

 

84

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61202.029L2-1

 

Table of Contents

Environmental ...............................................................................................

85

Physical...........................................................................................................

85

Power ..............................................................................................................

85

Appendix A. AT Commands...........................................................................................

87

Appendix B. Current Status Messages..........................................................................

93

Appendix C. Status Buffer Messages............................................................................

97

Appendix D. S-Register List ...........................................................................................

107

Appendix E. Connector Pinouts .....................................................................................

115

Acronyms ............................................................................................................................

121

Glossary ..............................................................................................................................

123

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ISU 128 User Manual

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Table of Contents

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ISU-128 User Manual

61202.029L2-1

 

 

List of Figures

Figure 1-1:

ISU 128 Rear Panel ................................................................................

2

Figure 1-2:

ISU 128 Front Panel...............................................................................

3

Figure 1-3:

ISU 128 Interoperability........................................................................

5

Figure 4-1:

VT 100 Status Screen .............................................................................

17

Figure 4-2:

VT 100 Configuration Screen ...............................................................

18

Figure 5-1:

VT 100 Test Screen.................................................................................

19

Figure 5-2:

Test Menu Tree ......................................................................................

20

Figure 5-3:

Loopback Points ....................................................................................

20

Figure 6-1:

Dial Line Menu Tree .............................................................................

23

Figure 6-2:

VT 100 Configuration Screen ...............................................................

24

Figure 6-3:

Configuration Menu Tree.....................................................................

27

Figure 6-4:

Dial Options, RS-366 Menu Tree.........................................................

29

Figure 6-5:

Dial Options, V.25 bis Menu Tree .......................................................

33

Figure 6-6:

Dial Line, Auto Answer Menu Tree ...................................................

34

Figure 6-7:

Data Bits Menu Tree..............................................................................

34

Figure 6-8:

V.25 bis ASYNC Menu Tree.................................................................

35

Figure 6-9:

Answer Tone Menu Tree......................................................................

37

Figure 6-10:

Connect Timeout Menu Tree ...............................................................

38

Figure 6-11:

Call Screening Menu Tree ....................................................................

38

Figure 6-12:

Leased Line Menu Tree ........................................................................

40

Figure 6-13:

Limited Distance Modem Application...............................................

40

Figure 6-14:

Leased Application with Channel Banks...........................................

41

Figure 6-15:

Asynchronous DTE Options Menu Tree............................................

42

Figure 6-16:

Synchronous DTE Options Menu Tree ..............................................

42

Figure 6-17:

Flow Control Menu Tree ......................................................................

44

Figure 6-18:

Data Format Menu Tree .......................................................................

45

Figure 7-1:

Protocol Menu Tree...............................................................................

48

Figure 7-2:

BONDING Mode 1 Protocol Menu Tree............................................

49

Figure 7-3:

V.34 Error Control Menu Tree.............................................................

51

Figure 7-4:

V.34 Compression Menu Tree .............................................................

52

Figure 7-5:

V.34 MNP Block Size Menu Tree ........................................................

52

Figure 7-6:

FALLBACK Menu Tree ........................................................................

55

Figure 7-7:

PPP Menu Tree ......................................................................................

56

Figure 8-1:

Quick Setup Menu Tree........................................................................

59

Figure 9-1:

VT 100 Terminal Dial Options Screen ................................................

67

Figure 9-2:

Dial Menu Tree ......................................................................................

68

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ISU 128 User Manual

vii

List of Figures

 

 

Figure 10-1:

Remote Configuration Menu Path ......................................................

72

Figure 10-2:

Remote Configuration Screen..............................................................

72

Figure 10-3:

Remote Unit Configuration Screen .....................................................

73

Figure 10-4:

Test Menu Path ......................................................................................

74

Figure 10-5:

Loopback Remote 1B.............................................................................

75

Figure 10-6:

Set Password Screen..............................................................................

75

Figure E-1:

EIA-232/RS-530 Interface.....................................................................

115

Figure E-2:

V.35 Interface..........................................................................................

117

Figure E-3:

RS-366 Interface......................................................................................

118

Figure E-4:

RJ-45 Interface ........................................................................................

118

Figure E-5

Maintenance Port...................................................................................

119

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List of Tables

Table 1-A:

DTE Indicators .......................................................................................

3

Table 1-B:

Recommended Operating Modes .......................................................

7

Table 3-A:

Maximum DTE Interface Cable Lengths............................................

12

Table 7-A:

Rate Adaption Protocols.......................................................................

54

Table E-A:

EIA-232 Interface ...................................................................................

115

Table E-B:

RS-530 Interface .....................................................................................

116

Table E-C:

V.35 Interface..........................................................................................

117

Table E-D:

RS-366 Interface .....................................................................................

118

Table E-E:

RJ-45 ISDN IFC ......................................................................................

118

Table E-F:

Maintenance Port...................................................................................

119

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List of Tables

xii

ISU 128 User Manual

61202.029L2-1

Chapter 1

Understanding ISDN and the ISU 128

ISDN OVERVIEW

The Integrated Services Digital Network (ISDN) is a public or private switched digital network. ISDN is an international standard for digital communications, allowing a full range of enhanced services supporting voice, data, and image applications through standard interfaces over a single telephone wire. ISDN provides a means of integrating these services and modernizing communication networks for information movement and management efficiency.

THE ADTRAN ISU 128

The ADTRAN ISU™ 128 is a stand-alone device that connects data terminal equipment (DTE) to the ISDN network or to a leased digital network for data transmission. The ISU 128 allows high-speed data transmission (up to 128 kbps) over a single ISDN line. The ISU 128 meets the Microsoft Windows®95 Plug-an-Play specifications. The file MDMADTN.INF is required. To obtain this file contact our website at URL of www.adtran.com ADTRAN technical support. The number is located on the inside back cover of this manual.

From the network, ISDN is delivered by a single 2-wire 2B1Q U-interface which is connected directly to the ISU 128. ISDN network termination is designed into the ISU 128, eliminating the need and expense of a separate NT1. For network testing, the ISU 128 responds to NT1 test commands from the telephone company central office (CO).

The ISU 128 transmits data over an RS-530, V.35 interface, or EIA-232 interface, selectable on the front panel. The ISU 128 performs at synchronous data transfer rates of 2400 bps to 128 kbps and asynchronous rates of 300 bps to 115.2 kbps. For speeds over 64 kbps, the industry standard BONDING or MULTILINK PPP protocol aggregates the two 64 kbps B channels for a maximum of 128 kbps. The ISU 128 is intended to support the transfer of data and images

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ISU 128 User Manual

1

Chapter 1. Understanding ISDN and the ISU 128

over ISDN. The ISU 128 may be viewed as an ISDN dial modem that allows cost-effective high-speed data transmission at rates up to 128 kbps.

The ISU 128 has one RJ-45 jack available on the rear panel for network connection (see Figure 1-1). The RJ-45 jack labelled ISDN IFC is for ISDN Basic Rate. ISDN Basic Rate service divides a standard telephone line into three digital channels capable of simultaneous voice and data transmission. The three channels are comprised of two bearer (B) channels at 64 kbps and one data (D) channel at 16 kbps (2B+D).

The ISU 128 also supports a leased digital connection that allows data to be transferred at up to 128 kbps over a 2-wire facility using the U-interface jack labelled ISDN IFC. This type of service is a permanent connection between end points and is sometimes referred to as a leased connection, a dedicated connection, a nailed-up connection, a private circuit, or a limited distance modem connection. These types of service are referred to in this manual as Leased Line Service.

Figure 1-1

ISU 128 Rear Panel

Dialing from the ISU 128 is accomplished in a variety of ways:

From the front panel

From up to ten stored numbers

Through an RS-366 dial port used in facsimile and video conferencing applications

Over the DTE interface using the AT command set

With V.25 bis in-band dialing (used in applications such as LAN/WAN bridging)

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ISU 128 User Manual

61202.029L2-1

Chapter 1. Understanding ISDN and the ISU 128

With DTR asserted, some bridges/routers raise DTR when bandwidth on their dedicated line is exceeded. In high-traffic times, this allows the ISU 128 to dial out over the ISDN for an extra 128 kbps of bandwidth-on-de- mand.

The ISU 128 front panel accommodates a 2-line, 16 character LCD display. Seven LED indicators monitor data flow and display the status of key DTE interface leads as described in Table 1-A. A front panel keypad supports configuration, test modes, test status, and dialing (see Figure 1-2).

 

 

 

 

 

ISU 128

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ENTER

 

1

 

2

 

3

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

4

 

5

 

6

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

RS CS TD RD CD TR SR

 

 

 

7

 

8

 

9

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CANCEL

 

*

 

0

 

#

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Figure 1-2

 

ISU 128 Front Panel

 

Table 1-A

 

DTE Indicators

 

 

 

Indicator

Definition

 

 

 

 

RS

Request to Send. Indicates the DTE is ready to transmit.

 

 

 

 

CS

Clear to Send. Indicates the ISU 128 is ready to transmit.

 

 

 

 

TD

Transmit Data. On when the DTE is transmitting to the ISU 128.

 

 

 

 

RD

Receive Data. On when the ISU 128 is receiving data from the far end.

 

 

 

 

CD

Carrier Detect. On when the ISU 128 is connected to a remote unit.

 

 

 

 

TR

Data Terminal Ready from DTE. On when DTR is active at DTE interface.

 

 

 

 

SR

Data Set Ready.

 

 

 

 

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ISU 128 User Manual

3

Chapter 1. Understanding ISDN and the ISU 128

ISU 128 INTEROPERABILITY

Telephone networks are evolving from analog technologies to digital technologies such as ISDN. This transition is time-consuming and costly for the telephone companies. Upgrading all locations and facilities is a lengthy process.

The ISU 128 bridges this transition by supporting communications with existing and future network services and equipment. The ISU 128 supports communications with Switched 56 service, Switched 56 DSUs (2-wire and 4-wire), various ISDN terminal adapters, ISDN terminal equipment, BONDING compatible inverse multiplexers, and analog modems with the optional V.34 modem (part number 1202029L3).

Figure 1-3 illustrates the ISU 128 operation in various switched network services and customer premises products.

4

ISU 128 User Manual

61202.029L2-1

Chapter 1. Understanding ISDN and the ISU 128

DTE

 

TA

-Interface

 

ISDN

U

 

NT1

 

 

Video Codec

 

 

 

SW56

BONDING Compatible Inverse MUX

 

56

DSU

 

 

 

or

 

Switched

 

 

 

 

ISDN

-Wire

 

 

 

 

 

 

 

 

4

 

 

 

NETWORK

 

 

 

 

 

56

 

Interface-

Switched

Path

2

 

Data

Wire

ISDN U

-

 

 

 

*

 

ISU

ISU 128

 

 

DTE

 

4-Wire DSU SW56 DSU *

* SW56 DSU

DSU 2-Wire

ISU 128 Interoperability

Figure 1-3

DTE

DTE

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ISU 128 User Manual

5

Chapter 1. Understanding ISDN and the ISU 128

RECOMMENDED OPERATING PROTOCOLS

The ISU 128 supports a wide range of operating modes. Many combinations of circuit type, protocol, and data rate may be selected. However, only the combinations shown in Table 1-B are recommended. As noted in Table 1-B, all asynchronous rates will support flow control. Flow control is required when operating at 115,200 bps using PPP (Point-to-Point Protocol), V.120, SAP (Simple Adtran Protocol), or asynchronous bonding.

Table 1-B shows that a given data rate may be achieved by more than one protocol/rate adaption selection. The table is organized so that selections with the least transport delay are closer to the top of the table for any given circuit type. Therefore, users should choose a protocol and rate closer to the top of the protocol rate list for a given circuit type.

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Chapter 1. Understanding ISDN and the ISU 128

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Table 1-B

 

 

 

 

 

 

 

 

Recommended Operating Modes

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Call Type

Protocol

Sync/

 

 

 

 

Rates Supported (bps)

 

 

 

Async

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

DIAL-64K

BONDING

Sync

56000

64000

 

 

 

 

 

 

 

 

 

 

Clear Chan

Sync

48000

56000

 

64000

 

 

 

 

 

 

 

 

PPP

Sync

2400

4800

 

9600

 

19200

38400

56000

64000

 

 

 

V.110

Sync

2400

4800

 

9600

 

19200

38400

 

 

 

 

 

V.120

Sync

9600

19200

 

38400

 

48000

 

 

 

 

 

 

Tlink

Sync

2400

4800

 

9600

 

19200

56000

64000

 

 

 

 

SAP

Sync

38400

 

 

 

 

 

 

 

 

 

 

 

PPP async-sync

Async

1200

2400

 

4800

 

9600

19200

38400

57600

115200f

 

BONDING

Async

2400

4800

 

9600

 

19200

38400

57600

 

 

 

 

V.110

Async

1200

2400

 

4800

 

9600

19200

38400v

 

 

 

 

V.120

Async

1200

2400

 

4800

 

9600

19200

38400

57600

115200f

 

Tlink

Async

1200

2400

 

4800

 

9600

19200

 

 

 

 

 

SAP

Async

38400

57600

 

115200f

 

 

 

 

 

 

DIAL-56K

BONDING

Sync

56000

 

 

 

 

 

 

 

 

 

 

 

Clear Chan

Sync

48000

56000

 

 

 

 

 

 

 

 

 

 

PPP

Sync

2400

4800

 

9600

 

19200

38400

56000

 

 

 

 

V.110

Sync

2400

4800

 

9600

 

19200

 

 

 

 

 

 

V.120

Sync

9600

19200

 

38400

 

48000

 

 

 

 

 

 

Tlink

Sync

2400

4800

 

9600

 

19200

56000

 

 

 

 

 

PPP async-sync

Async

1200

2400

 

4800

 

9600

19200

38400

57600

115200f

 

BONDING

Async

2400

4800

 

9600

 

19200

38400

57600

 

 

 

 

DSU 57.6

Async

57600

 

 

 

 

 

 

 

 

 

 

 

V.110

Async

1200

2400

 

4800

 

9600

19200

 

 

 

 

 

V.120

Async

1200

2400

 

4800

 

9600

19200

38400

57600

115200f

 

Tlink

Async

1200

2400

 

4800

 

9600

19200

 

 

 

 

DIAL-64K*2

BONDING

Sync

128000

 

 

 

 

 

 

 

 

 

 

 

MPPP

Sync

128000

 

 

 

 

 

 

 

 

 

 

 

MPPP

Async

115200f

 

 

 

 

 

 

 

 

 

 

 

BONDING

Async

115200f

 

 

 

 

 

 

 

 

 

 

DIAL-56K*2

BONDING

Sync

112000

 

 

 

 

 

 

 

 

 

 

 

MPPP

Sync

112000

 

 

 

 

 

 

 

 

 

 

 

MPPP

Async

115200f

 

 

 

 

 

 

 

 

 

 

 

BONDING

Async

115200f

 

 

 

 

 

 

 

 

 

 

LEASED 64K

Clear Chan

Sync

48000

56000

 

64000

 

 

 

 

 

 

 

 

SAP

Sync

2400

4800

 

9600

 

19200

38400

 

 

 

 

 

DSU 57.6

Async

57600

 

 

 

 

 

 

 

 

 

 

 

SAP

Async

1200

2400

 

4800

 

9600

19200

38400

57600f

115200f

LEASED 128K

Clear Chan

Sync

128000

 

 

 

 

 

 

 

 

 

 

 

SAP

Async

57600f

115200f

 

 

 

 

 

 

 

 

1.All asynchronous rates support flow control.

2.All dial-up modes support front panel, DTR, RS-366, AT command, and V.25 bis dialing

methods.

3. Rates marked with f require flow control.

4.Given a choice between two protocols, pick the protocol closer to the top of the list.

5.Multilink PPP supports the same rates as single-link PPP async-sync. Use the recommended rates for PPP async-sync.

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Chapter 1. Understanding ISDN and the ISU 128

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Chapter 2

ISDN Ordering Codes (IOCs)

ORDERING ISDN USING IOCS

The development of ISDN ordering codes (IOCs) simplifies the process of ordering ISDN service. The ISDN Solutions Group, a consortium of ISDN equipment vendors, service providers, and Bellcore, established these codes to represent predetermined line configurations for ISDN Basic Rate service for specific applications.

ADTRAN and Bellcore have registered and tested eight generic IOCs. Of these, four are recommended for operation of the ISU 128. After reviewing the following list, order ISDN lines from the local service provider. Request the appropriate IOC for your application. They are described in detail in this chapter.

In some areas, ISDN tariffs may warrant the use of ordering codes with less features. For example, in a particular region, there may be additional monthly expense associated with having voice service on each B channel. If you have a data only application, Capability R (previously Generic Data I) may be more cost-effective.

If these are not available from your service provider or you would like more information regarding ordering ISDN see the ADTRAN document Ordering ISDN Service User Guide part number 60000.015-8 or contact your telephone company for alternative line configurations. The Ordering ISDN Service User Guide is available on the ADTRAN home page at http://www.adtran.com or by calling ADTRAN.

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Chapter 2. ISDN Ordering Codes (IOCs)

ADTRAN has registered the following ISDN ordering codes to support a variety of tariffs and applications:

Capability S

2B service

Both B channels alternating voice and data

Two directory numbers

Applications

Host data center, internet access, bulletin board, and modem pooling applications

Modem capability

Generic data transfer, including remote access and LAN/WAN connectivity and telecommuting

Capability R

2B service

Data only

Two directory numbers

Applications

Host data center, internet access, bulletin board, and modem pooling applications

Data only applications, no modem capability

Data transfer applications, including remote access and LAN/WAN connectivity, telecommuting

Capability B

1B service

Data only

One directory number

Capability C

1B service

Alternating voice and data

One directory number

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Chapter 3

Installation

After unpacking the unit, immediately inspect it for possible shipping damage. If damage is discovered, file a claim immediately with the shipping carrier, then contact ADTRAN Repair and Return Department (see the end of this manual).

Ensure that a grounded, 115 VAC, 60 Hz receptacle is used to provide power.

NETWORK CONNECTION

The ISU 128 supports either dial or leased operation. An eight-pin RJ-45 modular jack labelled ISDN IFC on the rear panel allows connection to ISDN Basic Rate Service provided by the telephone company or to a leased type of service.

Dial operation uses the ISDN Basic Rate U-interface and allows the ISU 128 to dial out over the ISDN network. The Leased Line Service can be dedicated 2B1Q data service or a nailed-up circuit (twisted pair) that provides a dedicated connection between end points such as a limited distance modem or point- to-point connection. When using the ISU 128 in either of these types of service, connect the network interface to the RJ-45 connector labelled ISDN IFC.

See the appendix Connector Pinouts for network connection pin assignments.

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Chapter 3. Installation

DTE DATA CONNECTION

Data terminal equipment is connected to the ISU 128 by using either the RS530 interface, the V.35 interface, or EIA-232 interface on the rear panel of the ISU 128. The maximum recommended cable lengths are shown in Table 3-A. See the appendix Connector Pinouts for each interface pin assignments. Be sure to configure the menu option for the connector type used in your application. Refer to the section DTE Options for Asynchronous and Synchronous Operation in Chapter 6 to configure the connector type.

Table 3-A

Maximum DTE Interface Cable Lengths

DTE Interface

Max Cable Length

 

 

RS-530

50 feet

V.35

30 feet

EIA-232

15 feet

 

 

The RS-530 interface and the V.35 interface support data rates up to 128 kbps. The DTE rate is configured from the front panel of the ISU 128 or by using AT commands. See the chapter Configuration to configure the ISU 128 with the appropriate data rates.

To prevent possible radio frequency interference emissions, a shielded V.35 cable is required.

DIAL INTERFACE CONNECTION

If out-of-band RS-366 dialing is required for applications such as videoconferencing or FAX machines, the dialing interface of the host DTE should be connected to the dial port marked RS-366/Maintenance. Pin assignments for the RS-366 connector are listed in the appendix Connector Pinouts.

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Chapter 3. Installation

MAINTENANCE INTERFACE

The Maintenance Interface is available at 9600 bps, 8 data bits, no parity, asynchronous format, through the RS-366/Maintenance port. See the appendix Connector Pinouts for Maintenance port pin assignments. The VT 100 terminal or null modem can be connected to the RS-366/Maintenance port using an EIA-232 cable. This interface can be used to set internal S-registers, dial ISDN connections, and disconnect calls. This port also allows ADTRAN Technical Support personnel to retrieve vital information from the unit if a problem is encountered during initial configuration of the ISU 128. Most problems can be solved without resorting to this port for assistance.

In order to activate the Maintenance port, ensure the dial mode is either Front Panel or AT commands. When the dial mode is set for RS-366, the Maintenance port is disabled.

The Maintenance port cannot be used to pass data or to remotely configure another ISU 128 using the Cfg. Rmt. Unit option.

AT commands sent to the Maintenance port are not preceeded by "AT."

Example: To display the unit model number, enter: I0

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Chapter 3. Installation

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Chapter 4

Operation

MENU NAVIGATION

Four function keys on the left-hand side of the keypad allow the user to enter, exit, and scroll through the various menu branches. The four function keys are defined below.

Enter

Enters the selected item.

Up Arrow

Scrolls up a menu tree.

Down Arrow

Scrolls down a menu tree.

Cancel

Exits (back one level) from the current branch of

 

the menu tree.

For reading ease, function keys are represented in bold, initial caps text. Selectable menu items and messages displayed on the LCD are represented in bold type as they appear on the LCD.

Press either the Up or Down arrow to scroll through the menu tree. To choose an item, press the corresponding number on the keypad. The item blinks to show that it is selected and has been stored in non-volatile memory. Press Enter to select the item. Press Cancel to exit back through the menu tree.

It is important to note that some features in the ISU 128 do not immediately take effect upon selection. This prevents unintentional reconfiguration of the ISU 128 during an active call. Leased/Dial Line, and ISDN Switch Protocl, take effect only when the ISU is powered up or the U-interface is bounced (line broken and restored). To ensure the ISU is actually performing as configured, cycle the power off, then back on again, after these items are changed. Also, items such as Bit Rate, Protocol, and Call Type take effect only at the beginning of a new call.

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15

Chapter 4. Operation

GETTING STARTED

At power up, the front panel display is in the Current Status mode. This is the recommended resting place for the display as it shows the current operational status of the unit. For example, if the ISU 128 is not connected to the network, the Current Status menu displays ADTRAN ISU 128 Link Down. If the unit is connected to the network and functioning properly, it displays ADTRAN ISU 128 Ready. A list of Current Status messages is provided in the appendix Current Status Messages. Pressing Cancel repeatedly returns the unit to the Current Status menu. While at the Current Status menu, pressing any key changes the display to the top of the menu tree.

The menu tree allows for set up and operation of the ISU 128 from the front panel. The main branches of the menu tree follow:

1.STATUS

2.TEST

3.CONFIG (Configuration)

4.DIAL

Status Buffer

Select 1=STATUS from the top of the menu tree to display the status buffer. The Up and Down arrows allow viewing of the last fifty status messages generated during the operation of the unit. The most recent message displays last. An explanation of Status Buffer Messages can be found in the appendix Status Buffer Messages. To return to the top of the menu, press Cancel. The buffer can be cleared by pressing 0.

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Chapter 4. Operation

VT 100 TERMINAL MENU SUPPORT

When connected to an asynchronous VT 100 terminal or VT 100 terminal emulator, use the built-in ISU 128 menu system for configuration. To enter into the menus, type AT!V Enter. To go to a particular menu, simply press the hot keys for that menu. The main branches of the menu tree and their hot keys are:

STATUS (Ctl-V)

TEST (Ctl-T)

CONFIG (Ctl-C)

DIAL (Ctl-D)

Status Screen

To determine the current status of the unit, press Ctrl+V to access the Status Screen (see Figure 4-1). The Status Screen displays unit information such as the loop status, software revision, the result of the initial self test, and the status buffer messages. The most recent message always displays as Status Buffer 1. An explanation of status buffer messages can be found in the appendix

Status Buffer Messages.

Figure 4-1

VT 100 Status Screen

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Chapter 4. Operation

Configuration Screen

Once the unit is selected using the terminal interface, the display shows the Configuration Menu (see Figure 4-2). This screen shows the current configuration, line, and call status for the selected unit. See the chapter Configuration formore information about configuring the ISU 128.

Figure 4-2

VT 100 Configuration Screen

To configure the ISU 128 quickly and easily for most applications, see the chapter Quick Setup.

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Chapter 5

Testing

TEST OPTIONS

Pressing Ctl-T from any VT 100 terminal screen or selecting 2=TEST from the top of the menu tree on the front panel displays local testing options. Figure 5-1 shows the VT 100 terminal test screen and the menu tree is illustrated in Figure 5-2.

Figure 5-1

VT 100 Test Screen

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19

Chapter 5. Testing

 

 

1=Loopback DTE

 

 

 

 

1=STATUS

2=Loopback Netw.

 

 

 

 

3=Loopback Proto

 

 

 

 

2=TEST

4=Loopback Remote

 

 

 

 

3=CONFIG

 

 

 

 

5=Test Remote

 

 

 

 

4=DIAL

 

 

 

 

6=Lpbk Disable

 

 

 

 

 

 

 

 

 

 

7=NEBE/FEBE

1=No Rem Lpbks

 

 

 

 

 

0=Software Ver

 

 

 

 

 

2=DDS Accepted

 

 

 

 

 

3=V54 Accepted

 

 

 

 

 

4=DDS + V54 Accept

 

 

 

 

 

 

 

Figure 5-2

Test Menu Tree

Loopback DTE

Loopback DTE causes the ISU DTE port to loop back toward user equipment. This allows performance of a bit error rate test (BERT) between the ISU 128 and the end user equipment to verify proper cable connection.

Loopback Network

Loopback Network forces the ISU 128 to loopback both the B1 and B2 channels toward the network. This can be used to allow a far-end user to perform a BERT all the way through the network.

Loopback Protocol

Loopback Protocol allows data to loopback toward the network after passing through a selected protocol such as T-Link or BONDING. See Figure 5-3 for loopback points.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

NET

 

 

 

RATE

 

 

 

 

 

 

 

 

 

 

 

Protocol

 

 

DTE

DTE

NETWORK

 

Network

ADAPTION

 

 

 

 

 

DTE

 

 

 

IFC

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

IFC

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Figure 5-3

Loopback Points

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Chapter 5. Testing

Loopback Remote

Loopback Remote allows the ISU 128 to issue a V.54 in-band loopback command to a far-end unit while still accepting data from the DTE connector. This provides bit error rate testing of an entire link using an external BERT test set. To use this feature, both units must be configured for Clear Channel operation and the far-end unit must be able to respond to V.54 loopback commands. See the chapter Protocol Options to configure the unit for Clear Channel operation. Press the Cancel key to end the test.

Loopback Remote 1B and 2B are only used with the DTE set to asynchronous.

Test Remote

Test Remote allows the ISU 128 to issue a V.54 in-band loopback command to a far-end unit and BERT the link using a built-in 2047 pattern generator/ checker. This allows for testing a circuit without any extra test equipment. To use this feature, both units must be configured for Clear Channel operation and the far-end unit must be able to respond to V.54 loopback commands. See the chapter Protocol Options to configure the unit for Clear Channel operation. The built-in 2047 pattern generator/checker displays the number of bytes transmitted on the top line and the number of errored bytes received on the lower line of the front panel display. Press 0 to clear the counts. By pressing the down arrow, you can loop down the far end unit and run a head to head 2047 pattern test. Press Cancel to end the test.

Loopback Disable

The following options are available when disabling loopbacks:

No Remote Loopbacks

The ISU 128 ignores all V.54 and DDS loopback commands.

DDS Accepted

The ISU 128 responds to DSU Latching Loopback commands. This option only takes effect if the unit is in leased line mode.

V.54 Accepted

The ISU 128 responds to V.54 loopback commands.

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Chapter 5. Testing

DDS+V54 Accept

The ISU 128 responds to both DSU Latching Loopback commands (leased line mode only) and V.54 loopback commands.

The ISU must be optioned for Clear Channel operation for DSU Latching and V.54 loopback commands to take effect.

Near-End Block Errors/Far-End Block Errors (NEBE/FEBE)

NEBE/FEBE allows the user to determine the quality of the network connection by viewing the number of near-end (NEBE) and far-end (FEBE) block errors occurring on the ISDN interface. A large or incrementing count indicates problems with network equipment. An incrementing or large count of NEBEs indicates problems from the switch to the terminal adapter. An incrementing or large count of FEBEs indicates problems in the direction from the terminal adapter to the switch.

Software Version

Software Ver displays the software version and checksum in use on the ISU 128.

Press Cancel to exit any of these options.

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Chapter 6

Configuration

DIAL LINE OPERATION

This section explains how to configure the ISU 128 when using ISDN basic rate switched service. Figure 6-3 illustrates the entire CONFIG branch of the menu tree.

The following are step-by-step procedures for configuring the unit for dial line operation, switch protocol, call type, terminal ID, dial options, auto answer, answer tone, connect timeout, and call screening.

To dial calls over the ISDN, the unit must be configured for Dial Line. The menu path to select Dial line operation is shown in Figure 6-1.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1=Dial Line

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1=Netw. options

 

 

 

 

 

2=Leased Line

 

 

 

 

 

 

 

 

 

 

 

 

3=CONFIG

 

2=DTE options

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3=Protocol

 

 

 

 

 

 

 

 

4=Quick setup

 

 

 

 

 

 

 

 

5=Remote config

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Figure 6-1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Dial Line Menu Tree

When using a VT 100 terminal, press Ctl-C to access the Configuration screen, then set the Line type option to Dial Line. The Configuration screen appears as shown in Figure 6-2.

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23

Chapter 6. Configuration

Figure 6-2

VT 100 Configuration Screen

Switch Protocol

Find out what kind of ISDN switch your local CO is using by asking the telephone administrator or telephone company representative. Configure the ISU

128 for either a Northern Telecom DMS-100®, AT&T 5ESS® switch, or a switch conforming to the National ISDN-1 standard (usually an AT&T 5ESS, NTI DMS-100, or Siemens EWSD). In the Far East, configure for the NEC switch.

Call Type

The call type can be configured four different ways, depending on the type of service used: speech, audio, data 56 kbps, or data 64 kbps.

When placing outgoing calls using the optional V.34 modem, the unit must be optioned for either speech or audio call type.

Speech

Speech directs the call control software to request a Mu-law/A-law speech circuit as the bearer capability for outgoing calls. The Speech option is used with an ISDN line configured for voice service. In some areas voice service costs

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Chapter 6. Configuration

less than data service. A Speech call type does not guarantee an end-to-end digital connection with some local and long distance carriers.

Audio

Audio directs the call control software to request a 3.1 kHz audio circuit as the bearer capability for outgoing calls. The Audio option is used with an ISDN line configured for voice service. In some areas audio service is less expensive than data service. Selecting an Audio call type guarantees a digital end-to-end ISDN connection.

Data 56 kbps

Data 56 kbps directs the call control software to request a 64 kbps data circuit that is rate-adapted to 56 kbps. Data 56 kbps is intended for use in circumstances where interoperability with Switched 56 service is desired.

Data 64 kbps (default)

The default Call type for ISDN service is Data 64 kbps. This directs the call control software to request an unrestricted 64 kbps circuit.

Terminal Identification

Terminal identification is assigned by the local telephone company and consists of a Service Profile Identifier (SPID) and Local Directory Number (LDN).

Setting the SPID

The SPID is a sequence of digits used to identify ISDN terminal equipment to the ISDN switch. The SPID is assigned by the local phone company when the ISDN line is installed and it usually looks similar to the phone number. Obtain SPIDs from the telephone administrator or local telephone representative.

The number of SPIDs required (0, 1, or 2) depends on how your ISDN line is configured. For instance, a point-to-point line has no SPID. Multipoint lines may have one or two SPIDs. The ISU 128 uses the presence of SPID 1 to determine if the line is multipoint. If the line has only one SPID, then it must be entered in SPID 1.

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25

Chapter 6. Configuration

When selecting a SPID, use the Up and Down arrows to choose between SPID 1 and SPID 2. Press Enter to select the SPID and use the keypad to enter the SPID number. While entering/editing a SPID, the Down arrow allows ou to backspace through the number string to correct mistakes. The Up arrow scrolls back to the last digit entered. To cancel a number, use the Down arrow to backspace through it and press Enter. Press Enter after entering each SPID. To abort changes at any time, press Cancel.

Disconnect the network interface from the unit before initially entering and/or altering the SPIDs or LDNs.

Setting the LDN

This option allows the entry of 0, 1, or 2 LDNs. The LDN is used when placing or receiving BONDING calls. The LDN is the seven-digit local phone number assigned to the line.

When entering and LDN, use the Up and Down arrows to choose between LDN 1 and LDN 2. Press Enter to select the LDN and use the keypad to enter the LDN number. While entering/editing an LDN, the Down arrow allows you to backspace through the number string to correct mistakes. The Up arrow scrolls back to the last digit entered. To cancel a number, use the Down arrow to backspace through it and press Enter. Press Enter after entering each LDN. To abort changes at any time, press Cancel.

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Chapter 6: Configuration

 

‘Buffer Display’

 

 

 

 

 

 

 

 

 

 

1=Switch protocl

 

1=AT&T 5ESS

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2= DMS-100

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3=National ISDN1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

4=NEC Switch

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2=Call type

 

1=Speech

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1=Loopback DTE

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2=Audio

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3=Data 56Kbps

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2=Loopback Netw.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

4=Data 64Kbps

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3=Loopback Proto

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3=Terminal ID

 

Set SPID

 

 

 

 

 

 

 

 

 

 

 

 

 

 

4=Loopback Remote

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

5=Test Remote

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Set LDN

 

 

 

 

 

 

 

 

 

 

 

 

 

 

6=Lpbk Disable

 

 

1=No Rem Lpbks

 

 

 

 

 

4=Dial options

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1=Front Panel

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

7=NEBE/FEBE

 

 

2=DDS Accepted

 

 

 

 

 

 

 

 

 

 

 

 

 

1=1 sec or EON

 

 

 

 

 

 

8=Software Ver

 

 

3=V54 Accepted

 

 

 

 

 

 

 

 

 

2=RS-366

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

4=DDS + V54 Accept

 

 

 

 

3=AT commands

 

1=V.25 HDLC

 

 

 

 

2=2 sec or EON

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

4=V.25

 

 

 

 

3=5 sec (default)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

5=Disabled

2=V.25 ASYNC

 

 

 

 

4=10 sec or EON

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

5=Auto answer

 

1=Disabled

 

3=V.25 BISYNC

 

 

 

 

5=20 sec or EON

 

 

 

 

 

 

1=Netw. options

 

1=Dial Line

 

 

 

 

 

 

 

4=V.25 HDLC FLAG

 

 

6=Wait for EON

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2=Enabled

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3=Dump all calls

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

6=Answer tone

 

1=No answer tone

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2=Incoming tone

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3=Outgoing tone

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

4=Always tone

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1=15 sec

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

7=Connect Timout

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2=30 sec (def)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3=1 minute

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

4=2 minute

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

5=4 minute

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

8=Call Screening

 

1=Answer any

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2=ansr if SNO…9

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2=Leased Line

 

 

 

 

 

1=Clock mode

 

1=Slave

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2=Master

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2=Channel rate

 

1=64k

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2=128k

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1=Asynchronous

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2=DTE options

 

2=Synchronous

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1=TXINIT

 

 

 

 

 

 

 

 

1=Bit Rate

1=2400

 

6=48000

 

 

3=Protocol

 

1=Clear Channel

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2=4800

 

7=56000

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2=TXFA

 

 

 

 

 

 

 

 

 

3=9600

 

8=64000

 

 

 

 

 

2=BONDING mode 1

 

 

 

 

 

 

 

 

 

 

 

 

 

3=TXADD01

 

 

 

 

 

 

 

 

4=19200

 

9=112000

 

 

 

 

3=V.120

 

 

 

 

 

 

 

 

 

 

 

 

 

4=TXDEQ

 

 

 

 

 

 

 

 

 

5=38400

 

0=128000

 

 

 

 

4=V.34

 

 

 

 

 

 

 

 

 

 

 

 

 

5=TANULL

 

 

 

 

 

 

 

2=Connector Type

1=RS-530

 

 

 

 

 

 

5=V.110

 

 

 

 

 

 

 

 

 

 

 

 

 

6=TCID

 

 

 

 

 

 

 

 

 

2=V.35

 

 

 

 

 

 

6=DSU 57.6 ASYNC

 

 

 

 

 

 

 

 

 

 

 

 

 

1=Error Ctrl

 

1=Normal

 

 

 

 

 

 

 

 

7=T-LINK

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3=RS-232

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2=Compression

 

2=Direct

 

 

 

 

 

 

 

 

 

8=SAP

 

.

 

 

 

 

 

 

 

 

 

 

 

3=MNP Blk Size

 

3=Reliable MNP

 

3=RTS Options

1=1 Ms delay

 

 

 

 

 

9=FALLBACK

 

 

1=Fallback Def

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

4=Auto-Rel MNP

 

2=18 Ms delay

 

 

 

 

 

0=PPP asyn-sync

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1=Method

 

1=PPP

 

 

 

1=Clear Channel

 

 

 

5=Force LAPM

4=CTS Options

1=Forced CTS

 

 

4=Quick setup

 

 

 

 

 

 

 

 

 

 

2=BONDING mode

1

 

6=Force MNP

 

 

1=Dial 56K sync

 

2=TBD

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2=Follows RTS

 

 

 

 

2=Multilink PPP

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2=Dial 64Ksync

 

 

 

 

 

 

 

 

 

3=V.120

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3=Dial 112K sync

 

 

 

 

 

 

3=PPP w/Comp

 

 

 

4=V.34

 

 

 

 

 

 

 

 

5=CD Options

1=CD Forced on

 

 

 

 

 

4=Dial 128K sync

 

 

 

 

 

 

 

 

 

 

 

5=V.110

 

 

 

1=No Compression

 

2=Normal

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

6=DSU 57.6 ASYNC

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3=Off with LOCD

 

 

 

 

 

5=Dial PPP

 

 

 

 

 

 

 

 

 

 

 

 

 

2=Compress MNP5

 

 

 

 

 

 

6=V.34 1152 async

 

 

 

 

 

 

 

 

 

 

 

7=T-LINK

 

 

 

3=Compress V42

 

4=Off with Link Down

 

 

 

 

 

 

 

1=Leased 128k

 

 

 

 

8=SAP

 

 

 

 

 

 

 

 

 

 

 

 

7=Dial 57.6 asyn

 

 

 

 

 

 

 

 

 

 

 

 

 

4=Comp V42/MNP5

6=DTR Options

1=Ignore DTR

 

 

 

 

 

8=Dial 115.2 asy

 

 

2=Ldm 128 Master

 

 

 

9=PPP asyn-sync

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2=Cmd when Off

 

 

 

 

 

9=Fallback 57.6k

 

 

3=TBD

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1=64 bytes

 

3=Idle when Off

 

 

 

 

 

0=More

 

 

4=TBD

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

4=Off>On dial #0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2=128 bytes

 

 

 

 

 

 

 

 

 

 

 

5=TBD

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

5=Dial #0 if On

 

 

 

 

 

 

 

 

 

 

6=TBD

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3=192 bytes

 

 

5=Remote config

 

1=Cfg. Rmt. Unit

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

6=Answer if On

 

 

 

 

 

 

 

7=TBD

 

 

 

 

 

 

 

 

 

 

 

 

 

 

4=256 bytes

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

7=Dial/Ans if On

 

 

 

 

2=Set Password

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1=Hang up line

 

3=Loopback remote

 

1B

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

7=DSR Options

1=DSR forced on

 

 

2=Dial number

 

 

4=Loopback remote 2B

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2=OFF Idle+Test

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3=Redial last #

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3=OFF Link Down

 

 

4=Answer Call

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

5=Dial Stored #

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

8=Transmit Clock

1=Normal

 

 

 

6=Store/Review #

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2=External

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1=Bit Rate

1=300

6=19200

 

2=1200

7=38400

 

3=2400

8=57600

 

4=4800

9=115200

 

5=9600

 

 

2=Connector Type

1=RS-530

 

 

 

2=V.35

 

 

 

3=RS-232

 

 

3=RTS Options

1=1 Ms delay

 

 

2=18 Ms delay

 

4=CTS Options

1=Forced CTS

 

 

2=Follows RTS

 

5=CD Options

1= CD Forced on

 

 

2=Normal

 

 

 

3=Off with LOCD

 

 

4=Off with Link Down

6=DTR Options

1=Ignore DTR

 

 

2=Cmd when Off

 

 

3=Idle when Off

 

 

4=Off>On dial #0

 

 

5=Dial #0 if On

 

 

6=Answer if On

 

 

7=Dial/Ans if On

 

7=DSR Options

1=DSR forced on

 

 

2=OFF Idle+Test

 

 

3=OFF Link Down

8=Flow Control

1=Hardware Flow

 

2=Software Flow

 

 

3=No Flow Ctrl

 

9=Data Format

1=Data Bits

 

1=8 Data Bits

 

 

 

2=7 Data Bits

 

2=Parity Bits

1=None

 

 

 

2=Odd

 

 

 

3=Even

 

3=Stop Bits

 

1=1 Stop bit

 

 

 

2=1.5 Stop bits

 

 

 

3=2 Stop Bits

Configur

1

ISU 128 User Manual

27

Chapter 6: Configuration

28

ISU 128 User Manual

Chapter 6. Configuration

Dial options

The ISU 128 can be configured to dial using the Front Panel, RS-366 port, AT Commands, or V.25 bis Commands. Figure 6-4 illustrates the menu tree.

Front Panel

To establish and disconnect calls from the front panel keypad, configure Dial options for Front Panel. See the section Front Panel Dialing Options for more detail.

RS-366

To establish and disconnect calls using the RS-366 parallel dialing port, configure the unit for RS-366 dialing. This enables the RS-366 port on the rear of the unit. Whenever this dialing mode is enabled, DTR must be active before a call is placed. The call may be disconnected by dropping DTR, or from the front panel by selecting the #(pound) key to go directly to the Dial menu and selecting 1=Hang up line, then Enter.

DTE RS-366 dialers can end a string of dialed numbers in two different ways. The end of number (EON) alerts the ISU 128 that the entire number has been sent. Another method is to simply stop sending numbers and allow the ISU to time out, then dial the number. The ISU 128 supports both methods of dialed number terminations. The following options in Figure 6-4 allow for fine-tun- ing the dialed number termination.

 

 

 

 

 

 

 

 

 

1=Switch protocl

 

 

 

 

 

 

 

 

 

 

 

 

2=Call type

1=Front Panel

 

 

 

 

 

1=Dial Line

 

 

 

3=Terminal ID

 

 

 

 

 

 

 

 

 

 

 

 

 

2=RS-366

 

 

 

1=Netw. options

 

 

2=Leased Line

 

 

4=Dial options

 

 

 

 

 

 

 

 

 

 

 

 

3=AT commands

3=CONFIG

 

2=DTE options

 

 

 

 

 

5=Auto answer

 

 

 

 

 

 

4=V.25

 

 

3=Protocol

 

 

 

 

 

6=Answer tone

 

 

 

 

 

 

 

5=Disabled

 

 

4=Quick setup

 

 

 

 

 

7=Connect Timout

 

 

 

 

 

 

 

 

 

 

 

 

 

5=Remote config

 

 

 

 

8=Call Screening

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1=1 sec or EON 1=2 sec or EON 3=5 sec or (default) 4=10 sec or EON 5=20 sec or EON 6=Wait for EON

Figure 6-4

Dial Options, RS-366 Menu Tree

61202.029L2-1

ISU 128 User Manual

29

Chapter 6. Configuration

1 sec or EON

The ISU 128 assumes the dial string is fully entered if more than one second elapses since the last digit was entered, or the unit receives the EON command.

2 sec or EON

The ISU 128 assumes the dial string is fully entered if more than two seconds elapse since the last digit was entered, or the unit receives the EON command.

5 sec or EON (default)

The ISU 128 assumes the dial string is fully entered if more than five seconds elapse since the last digit was entered, or the unit receives the EON command. This is the factory default setting.

10 sec or EON

The ISU 128 assumes the dial string is fully entered if more than 10 seconds elapse since the last digit was entered, or the unit receives the EON command.

20 sec or EON

The ISU 128 assumes the dial string is fully entered if more than 20 seconds elapse since the last digit was entered, or the unit receives the EON command.

Wait for EON

The ISU 128 assumes the dial string is fully entered only if the unit receives the EON command.

AT Commands

Configuring the ISU 128 for AT commands enables in-band dialing over the DTE interface using asynchronous AT commands. AT commands can be used to set up the ISU 128 as well as establish and end a call. Calls can be disconnected from the front panel (as previously described) or from the far-end unit.

When AT commands are selected, the DTE port becomes dual purpose. First, while a call is not established, the port accepts AT commands. During this time, the Carrier Detect (CD) signal is inactive. Second, when a call is established, the port is used for data. This data mode is indicated by the CD signal active. See the appendix AT Commands for a listing of the supported AT commands and their functions. In addition to the front panel, the ISU 128 can be configured and controlled with in-band AT commands from an asynchronous DTE port.

30

ISU 128 User Manual

61202.029L2-1

Chapter 6. Configuration

To exit the data mode and enter the command mode, the asynchronous DTE device must transmit a proper escape sequence to the ISU 128. A specified time delay must occur between the last data character and the first escape sequence character. This is the guard time delay, and it can be changed by writing a value to the S12 register. The default value for the guard time is one second. For a valid escape sequence to occur, the DTE must transmit the escape code character three times in succession with delay between each character being less than the guard time. The default escape sequence is +++.

Once the command mode is entered, AT commands can be transmitted to the ISU 128 to configure most of the options, dial remote DSUs, or initiate tests to check both the ISU 128 and the network connections. All command lines must begin with the AT character set in either capital or lower case letters and end with a terminating character. A command line can be terminated at any time by transmitting the Ctl-X (ASCII 018) after the AT attention code. The ISU 128 ignores this command line and issues an OK response.

The command line may contain a single command or a series of commands after the AT attention code. When a series of commands are used, the individual commands may be separated with spaces for readability. The maximum length for a command line is 40 characters. Each command line is executed by the ISU 128 upon receipt of a terminating character.

The default terminating character is a carriage return (ASCII 013), but it can be changed by writing a different value to register S3. Before the terminating character is transmitted, the command line can be edited by using the backspace character (ASCII 008) to erase errors so the proper commands can be entered. Examples of using AT commands are provided in this section.

Using AT Commands

Type AT followed by the letter of the command and numeric value of the setting desired and then press Enter. The following command returns the software version of the unit:

ATI1

Using S-Registers

The configuration of the ISU 128 can be changed and/or reviewed with S-reg- isters. See the appendix S-Register List for a description of each S-register and its corresponding range of values.

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Chapter 6. Configuration

Reading S-Registers

Type ATS followed by the number of the S-register to be read followed by a question mark and press Enter.

ATS0?

Reading S-Register Strings

The ISU 128 uses S-register strings to store strings of digits for stored phone numbers, SPIDs, etc. Type ATSS followed by the number of the string S-reg- ister to be read followed by a question mark and press Enter.

ATSS80?

Changing S-Registers

Type ATS followed by the number of the S-register to be changed, an equal sign, the numeric value to be assigned to the register, then press Enter.

ATS0=2

Changing S-Register Strings

Type ATSS followed by the number of the string S-register to be changed, an equal sign, the numeric string to be assigned to the register, then press Enter.

ATSS80=5551212

Dialing a Call Using the AT Command Processor

To dial a number using the DTE terminal and AT commands type ATD and the telephone number on one line and press Enter.

ATD5551212

When the dialing process begins, the front panel reads Dialing 5551212. If the call is successful, Connect is displayed on the front panel, followed by the rate adaption protocol in use and the bit rate. If the call is not successful, the front panel displays Disconnect followed by Ready. At this point the unit is ready for another call. The status buffer can be examined to find the reason for an unsuccessful call.

To end an active call with the AT command processor, press the break in key sequence (+++) or the redefined key, then type ATH and press Enter to hang up the line.

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Chapter 6. Configuration

V.25 bis

Configuring the ISU 128 for V.25 bis (see Figure 6-5) enables in-band dialing over a DTE interface using asynchronous or synchronous V.25 bis commands. V.25 bis can be used to establish and end a call. Disconnecting calls can also be done from the front panel (as previously described) or from the far-end unit.

V.25 bis dialing is used primarily by DTE with synchronous interfaces (HDLC/SDLC or BSC/BISYNC) not supporting the AT command set, which is commonly used by asynchronous devices. The ISU 128 supports V.25 bis inband dialing in accordance with Fascicle VIII.I - V.25 bis (Malaga-Torremoli- nos 1984, Melbourne 1988).

 

 

 

 

 

 

 

 

 

 

 

1=Switch protocl

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2=Call type

1=Front Panel

 

 

 

 

 

 

 

 

1=Dial Line

 

 

 

3=Terminal ID

 

 

 

 

 

 

 

 

 

 

 

2=RS-366

 

 

 

 

 

1=Netw. options

 

 

2=Leased Line

 

 

4=Dial options

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3=AT commands

 

 

3=CONFIG

 

2=DTE options

 

 

 

 

 

5=Auto answer

 

 

 

 

 

 

 

 

4=V.25

 

1=V.25 HDLC

 

 

 

 

3=Protocol

 

 

 

 

 

6=Answer tone

 

 

 

 

 

 

 

 

 

 

5=Disabled

2=V.25 ASYNC

 

 

 

 

4=Quick setup

 

 

 

 

 

7=Connect Timout

 

 

 

 

 

 

 

 

 

 

 

3=V.25 BISYNC

 

 

 

 

5=Remote config

 

 

 

 

8=Call Screening

 

 

 

 

 

 

 

 

 

 

 

 

4=V.25 HDLC FLAG

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Figure 6-5

Dial Options, V.25 bis Menu Tree

Recommendation V.25 uses the following DCE/DTE control signals:

Transmitted data ..........................................................

circuit 103

Received data................................................................

circuit 104

Ready for sending ........................................................

circuit 106

Data set ready ...............................................................

circuit 107

Data terminal ready .................................................

circuit 108/2

Calling indicator...........................................................

circuit 125

The ISU 128 supports the following V.25 bis commands to control automatic calling and answering:

CRN.....................................

call request (number in command)

CRS .......................................

call request (using stored number)

PRN ........................................................

program stored number

RLN ..................................................................

list stored number

CIC..............................................................

connect incoming call

DIC ........................................................

disconnect incoming call

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Chapter 6. Configuration

When using stored numbers, V.25 bis accesses stored numbers 1 through 9 used by front panel dialing. See Front Panel Dialing Options.

Auto Answer should be set to Disabled (shown in Figure 6-6) if V.25 bis is in control of answering incoming calls with the CIC/DIC commands, since the other settings for Auto Answer will override V.25 control of the answer function.

 

 

 

 

 

 

 

 

 

 

 

 

 

1=Switch protocl

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2=Call type

 

 

 

 

 

 

 

 

 

 

 

 

 

1=Dial Line

 

 

 

3=Terminal ID

 

 

 

 

 

 

 

 

1=Netw. options

 

 

 

 

2=Leased Line

 

4=Dial options

 

 

1=Disabled

 

 

 

 

 

 

 

 

 

 

 

 

2=Enabled

 

3=CONFIG

 

2=DTE options

 

 

 

 

 

 

5=Auto answer

 

 

 

 

 

 

 

 

 

 

 

 

 

3=Dump all calls

 

 

 

 

3=Protocol

 

 

 

 

 

6=Answer tone

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

4=Quick setup

 

 

 

 

 

7=Connect Timout

 

 

 

 

 

 

 

 

5=Remote config

 

 

 

 

8=Call Screening

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Figure 6-6

Dial Line, Auto Answer Menu Tree

V.25 ASYNC Dialing

V.25 bis specifies that the characters should be ASCII, 7 bits, even parity and one stop bit. However, for versatility the ISU 128 allows the data, parity, and stop bits as defined under Data bits. (See Figure 6-7.)

 

 

 

 

 

 

 

 

1=Bit Rate

 

 

 

 

 

 

 

 

 

 

 

 

 

2=Connector Type

 

 

 

 

 

 

 

 

1=Netw. options

 

 

3=RTS Options

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

4=CTS Options

 

 

 

 

 

 

3=CONFIG

 

2=DTE options

 

 

1=Asynchronous

 

5=CD Options

 

 

 

 

 

 

 

 

 

2=Synchronous

 

 

 

 

 

 

 

 

3=Protocol

6=DTR Options

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

4=Quick setup

 

 

 

7=DSR Options

 

 

 

 

 

 

 

 

5=Remote config

 

 

8=Flow Control

 

 

 

1=8 Data bits

 

 

 

 

 

 

 

 

 

 

 

1=Data Bits

 

 

 

 

 

 

 

 

 

 

9=Data Format

 

2=Parity Bits

 

2=7 Data bits

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3=Stop Bits

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Figure 6-7

Data Bits Menu Tree

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Chapter 6. Configuration

The setting in Figure 6-8 allows for V.25 bis messages in asynchronous (start/ stop) data format.

 

 

 

 

 

 

 

 

 

1=Switch protocl

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2=Call type

1=Front Panel

 

 

 

 

 

 

 

1=Dial Line

 

 

 

3=Terminal ID

 

 

 

 

 

 

 

 

 

 

2=RS-366

 

 

 

 

1=Netw. options

 

 

2=Leased Line

 

 

4=Dial options

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3=AT commands

 

 

3=CONFIG

 

2=DTE options

 

 

 

 

 

5=Auto answer

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

4=V.25

 

1=V.25 HDLC

 

 

3=Protocol

 

 

 

 

6=Answer tone

 

 

 

 

 

 

 

5=Disabled

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2=V.25 ASYNC

 

 

 

4=Quick setup

 

 

 

 

 

7=Connect Timout

 

 

 

 

 

 

 

 

 

3=V.25 BISYNC

 

 

5=Remote config

 

 

 

 

8=Call Screening

 

 

 

 

 

 

 

 

 

 

4=V.25 HDLC FLAG

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Figure 6-8

V.25 bis ASYNC Menu Tree

Although V.25 bis allows asynchronous data format, asynchronous DTE is more likely to support the AT command set than V.25 bis.

V.25 SYNC HDLC Dialing

This setting provides V.25 bis messages in bit-synchronous format (for example HDLC, SDLC, X.25). The bit-synchronous format is the most commonly used by V.25 bis.

This option specifies that the characters should be 7-bit ASCII, with the 8th bit ignored (it may be either 0 or 1).

The first byte of each packet contains all ones (A = FF HEX), and the second byte of each packet (the C byte) is either 13 HEX or 03 HEX if not the final packet.

V.25 SYNC BISYNC Dialing

This setting allows for V.25 bis messages in byte synchronous format (BISYNC). V.25 bis specifies that the characters should be ASCII, 7 bits, and odd parity. This setting allows synchronous DTE which does not use HDLC to support serial in-band dialing.

V.25 HDLC FLAG

Configuring the ISU 128 for HDLC FLAG V.25 bis enables in-band dialing over a DTE interface using standard synchronous HDLC V.25 bis commands with 0x7E hex idle.

Disabled

This selection disables in-band dialing over the DTE interface.

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Chapter 6. Configuration

Auto Answer

The ISU 128 auto answer parameter can be configured in one of three ways: Disabled, Enabled, or Dump all calls.

Disabled

When Disabled is selected, the ISU 128 will not automatically answer an incoming call. The AT answer command (ATA) must be issued to the ISU 128 before it accepts the incoming call. The ringing call can be dumped using the Hang up line command, or answered using the Answer Call command.

These commands are listed under the Dial branch of the main tree. See the chapter Dial Options for more detail.

Enabled

When Enabled is selected, the incoming call is answered. If that call is a BONDING call and requires two B channels, the second call is answered. If the unit is configured for a call that uses only one B channel, such as 56 kbps or 64 kbps, the ISU 128 will not accept a second incoming call.

Dump all calls

When Dump all calls is selected, the ISU 128 will not accept any incoming calls. This keeps the line clear for outgoing calls.

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Chapter 6. Configuration

Answer Tone

The Answer tone option (shown in Figure 6-9) enables the transmission of a modem answer tone at the start of voice and audio calls. The purpose of this tone is to disable echo suppression and echo cancelling on the circuit in order to get a clear digital circuit. This may be necessary on some long distance circuits. The specifics of the tone are 4 seconds, 2100 Hz at a -10 dB level, with phase reversals every 475 ms.

 

 

 

 

 

 

 

 

 

 

 

 

 

1=Switch protocl

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2=Call type

 

 

 

 

 

 

 

 

 

 

 

 

1=Dial Line

 

 

 

3=Terminal ID

 

 

1=No answer tone

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1=Netw. options

 

 

 

 

2=Leased Line

 

4=Dial options

 

 

 

 

 

 

 

 

 

 

 

 

 

2=Incoming tone

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3=CONFIG

 

2=DTE options

 

 

 

 

 

 

5=Auto answer

 

 

 

 

 

 

 

 

 

3=Outgoing tone

 

 

 

 

3=Protocol

 

 

 

 

 

6=Answer tone

 

 

 

 

 

 

 

 

 

 

 

 

 

 

4=Always tone

 

 

 

 

4=Quick setup

 

 

 

 

 

7=Connect Timout

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

5=Remote config

 

 

 

 

8=Call Screening

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Figure 6-9

Answer Tone Menu Tree

No Answer Tone (Default)

This option disables Answer tone on incoming calls.

Incoming Tone

This option enables Answer tone on incoming calls.

Outgoing Tone

This option enables Answer tone on outgoing calls.

Always Tone

This option enables Answer tone on either incoming or outgoing calls.

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Chapter 6. Configuration

Connect Timeout

Connect Timout sets the length of time that the ISU 128 waits for a far-end unit to answer an outgoing call. These choices are illustrated in Figure 6-10.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1=Switch protocl

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2=Call type

 

 

 

 

 

 

 

 

 

 

 

 

 

1=Dial Line

 

 

 

3=Terminal ID

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1=Netw. options

 

 

 

 

2=Leased Line

4=Dial options

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3=CONFIG

 

2=DTE options

 

 

 

 

 

 

 

5=Auto answer

 

 

1=15 sec

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3=Protocol

 

 

 

 

 

6=Answer tone

 

 

 

 

 

 

 

 

 

 

 

 

2=30 sec (default)

 

 

 

 

 

 

4=Quick setup

 

 

 

 

 

7=Connect Timout

 

 

 

 

 

 

 

 

 

 

 

 

3=1 Minute

 

 

 

 

 

 

5=Remote config

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

8=Call Screening

 

 

 

 

 

 

 

 

 

 

 

 

4=2 Minute

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

5=4 Minute

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Figure 6-10

Call Screening

 

 

 

 

Connect Timeout Menu Tree

 

 

 

 

 

 

 

 

 

Call Screening allows the ISU 128 to answer all incoming calls (default) or only calls originating from phone numbers stored in the DIAL menu as stored numbers SN0 through SN9. See the section Front Panel Dialing Options, to review how to store numbers. Figure 6-11 illustrates the menu tree for setting call screening.

 

 

 

 

 

 

 

 

 

 

 

 

 

1=Switch protocl

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2=Call type

 

 

 

 

 

 

 

 

 

1=Dial Line

 

 

 

3=Terminal ID

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1=Netw. options

 

 

 

 

2=Leased Line

4=Dial options

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3=CONFIG

 

2=DTE options

 

 

 

 

 

 

5=Auto answer

 

 

 

 

 

 

 

 

 

 

 

3=Protocol

 

 

 

 

 

 

 

 

 

 

1=Answer any

 

 

 

 

 

 

 

 

6=Answer tone

 

 

 

 

4=Quick setup

 

 

 

 

 

 

 

 

 

2=Ansr if SN0...9

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

7=Connect Timout

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

5=Remote config

 

 

 

 

8=Call Screening

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Figure 6-11

Call Screening Menu Tree

When Call Screening is set to answer any numbers if stored in SN0 through SN9 (Ansr if SN0...9), an incoming call is not answered if the Call ID received from the switch does not match a stored number. Depending on the switch protocol, the Call ID may be presented in either a sevenor ten-digit format.

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Chapter 6. Configuration

The ISU 128 displays the Call ID for all dumped calls in the Status buffer. See the section Status Buffer for more information on the Status buffer.

Because different switches handle calls and Call ID differently,

use the following procedure to determine if a seven or ten digit Call ID (phone number) should be stored:

1.Select Ansr if SN0. . .9 under Call Screening.

2.Store your seven digit number in SN0.

3.Place a call to the ISU 128 with the stored number to determine whether it answers properly.

4.If the ISU 128 does not answer the call, look at the Call ID message in the Status buffer. An explanation of Status buffer messages is located in the appendix Status Buffer Messages. More than likely, the Call ID number is a ten digit number

5.Reenter the number in SN0 as it is displayed in the Call ID message and test Call Screening again.

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Chapter 6. Configuration

LEASED LINE SERVICE

This section explains how to configure the ISU 128 when using a 2B1Q leased digital service or a service that provides a permanent connection between end points. Figure 6-12 illustrates the menu tree for setting leased line.

 

 

 

 

 

 

 

 

1=Dial Line

 

1=Slave

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1=Netw. options

 

 

 

2=Leased Line

 

 

1=Clock mode

2=Master

 

 

 

 

 

 

 

 

 

 

 

 

3=CONFIG

 

2=DTE options

 

 

 

2=Channel rate

1=64k

 

 

 

 

 

3=Protocol

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2=128k

 

 

 

 

4=Quick setup

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

5=Remote config

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Figure 6-12

 

 

 

 

 

 

 

 

 

 

 

Leased Line Menu Tree

Selecting leased line configures the unit for leased line service or service that provides a permanent connection between end points such as limited distance modem.

Follow this step-by-step procedure to configure the ISU 128 for Leased Line Clock mode and Channel rate.

Clock Mode:Slave/Master

By configuring the ISU 128 for Master timing, the ISU 128 can provide clocking for both ends of the phone line. This Master option is used at one end of a limited distance modem application, where two ISU 128 units are directly connected without the use of channel banks (see Figure 6-13). The far-end unit should be configured for Slave and it derives its clocking from the ISU 128 configured as Master.

 

ISU 128

18,000 Ft

ISU 128

 

 

*

Mixed Gauge Wire

*

 

DTE

ISU 128

 

ISU 128

DTE

Master

 

Leased 128K

Figure 6-13

Limited Distance Modem Application

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ISU 128 User Manual

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Chapter 6. Configuration

If two ISU 128 units are connected through channel banks, both units should be configured for Slave mode (see Figure 6-14). To easily configure ISU 128s for this application, one unit can be optioned using Quick Setup, Ldm 128 Master and the other using Quick Setup, Leased 128k sync. For more information, refer to the chapter Quick Setup.

BIMUX DP or Equivalent

XXXXX

XXXXX

XXXXXXXXX

*

ISU 128

DTE

T1

BIMUX DP or Equivalent

XXXXX

XXXXX

XXXXXXXXX

*

ISU 128

DTE

Figure 6-14

Leased Application with Channel Banks

Channel Rate

In Leased Line operation, the data rate for the ISU 128 can be configured for 64 kbps or 128 kbps. When 64 kbps is selected, only one bearer channel (B1) is used. When 128 kbps is selected both bearer channels (B1 and B2) are used.

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Chapter 6. Configuration

DTE OPTIONS

The following procedure configures the DTE options for asynchronous and synchronous applications. Figure 6-15 and Figure 6-16 illustrate the menu trees for both asynchronous and synchronous operation.

Ensure your DTE equipment is set for asynchronous operation before attempting to make an asynchronous call. Failure to do so will cause the call attempt to fail.

1=Netw. options

3=CONFIG 2=DTE options

3=Protocol

4=Quick setup

5=Remote config

1=Netw. options

3=CONFIG 2=DTE options

3=Protocol

4=Quick setup

5=Remote config

Bit Rate

1=Bit Rate

2=Connector Type

3=RTS Options

4=CTS Options

1=Asynchronous

5=CD Options

2=Synchronous

6=DTR Options

7=DSR Options

8=Flow Control

9=Data Format

Figure 6-15

Asynchronous DTE Options Menu Tree

1=Bit Rate

2=Connector Type

3=RTS Options

4=CTS Options

1=Asynchronous

5=CD Options

2=Synchronous

6=DTR Options

7=DSR Options

8=Transmit Clock

Figure 6-16

Synchronous DTE Options Menu Tree

The Bit Rate can be set asynchronously for 300, 1200, 2400, 4800, 9600, 19200, 38400, 57600, and 115200 bps.

The Bit Rate can be set synchronously for 2400, 4800, 9600, 19200, 38400, 48000, 56000, 64000, 112000, and 128000 bps.

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Chapter 6. Configuration

Connector Type

The ISU 128 can provide an EIA-232, RS-530, or V.35 interface to a DTE by selecting the desired connector type.

RTS Options

Selecting 1 MS delay causes the Clear-to-Send (CTS) signal to change states 1 millisecond after the DTE Ready-to-Send (RTS) signal changes state. The 18 MS delay causes the CTS signal to change state 18 milliseconds after the DTE RTS signal changes state.

CTS Options

Selecting Forced CTS causes the CTS signal on the DTE connector to be continually asserted. Selecting Follows RTS causes the CTS signal to follow the state of the RTS lead.

CD Options

Selecting CD Forced on causes the carrier detect (CD) signal to always be asserted. Selecting Normal causes the CD signal to be asserted when a call has been successfully established. Selecting Off with LOCD causes the CD signal to be disasserted for a period of 5 seconds, then reasserted at the termination of a call. Selecting Off with Link Down causes the CD signal to be disasserted when the U-interface is not present.

DTR Options

Selecting Ignore DTR causes the ISU 128 to disregard the state of the data terminal ready (DTR) pin. Cmd when Off forces the unit into the AT command processor mode when DTR is not asserted. To return on-line, DTR must be asserted, followed by the AT0 command. Idle when Off forces the unit to end the current call when DTR is no longer asserted. Off>On dial #0 allows one call attempt to be automatically established when the DTR signal goes from inactive to active. While DTR is active, front panel dialing is also possible.

When DTR goes inactive, any outgoing call present is disconnected. Off>On dial #0uses the phone number in stored number register 0 to establish the call. To store a number for automatic dialing see the chapter Dialing Options. Selecting Dial #0 if On allows calls to be automatically established when the

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Chapter 6. Configuration

DTR signal is in the active state. The unit attempts to establish a call using SN0 until the call is established or DTR goes inactive. Selecting Answer if On only allows the unit to answer an incoming call if the DTR signal is asserted. Dial/ Ans if On... allows the unit to dial Stored Number 0 or answer if DTR is asserted.

DSR Options

Selecting DSR forced on causes the Data Set Ready (DSR) signal on the DTE connector to always be asserted. Selecting OFF Idle+Test causes DSR to be disasserted if the network interface is in test or there is not an active call. OFF Link Down causes DSR to be disasserted if the network interface is disrupted.

Flow Control (Asynchronous Data Format)

Selecting Hardware Flow (as shown in Figure 6-17) causes the ISU 128 received data to be presented to the DTE interface only when RTS is asserted. Software Flow control uses Xon/Xoff to control data transferred between the DTE and the ISU 128. Selecting No Flow Ctrl disables flow control.

 

 

 

 

 

 

 

 

 

 

 

 

1=Bit Rate

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2=Connector Type

 

 

 

 

 

 

 

 

1=Netw. options

 

 

 

 

 

3=RTS Options

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

4=CTS Options

 

 

 

 

 

 

 

 

 

 

 

 

1=Asynchronous

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3=CONFIG

 

 

2=DTE options

 

 

 

 

 

5=CD Options

 

 

 

 

 

 

 

 

 

 

2=Synchronous

 

 

 

 

 

 

 

 

 

3=Protocol

 

 

6=DTR Options

 

1=Hardware Flow

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

4=Quick setup

 

 

 

 

 

7=DSR Options

 

 

 

 

 

 

5=Remote config

 

 

 

 

 

2=Software Flow

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

8=Flow Control

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3=No Flow Ctrl

 

 

 

 

 

 

 

 

 

 

 

 

 

9=Data Format

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Figure 6-17

Flow Control Menu Tree

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Chapter 6. Configuration

Data Format (Asynchronous)

A frame consists of a start bit, 7 or 8 data bits, 0 or 1 parity bit, and 1 to 2 stop bits. The settings for Data Bits, Parity Bits, and Stop Bits are available as shown in Figure 6-18.

 

 

 

 

 

 

 

 

 

 

 

 

1=Bit Rate

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2=Connector Type

 

 

 

 

1=Netw. options

 

 

 

 

 

 

3=RTS Options

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

4=CTS Options

 

 

3=CONFIG

 

2=DTE options

 

 

 

1=Asynchronous

 

 

 

5=CD Options

 

 

 

 

 

 

 

2=Synchronous

 

 

 

 

 

3=Protocol

 

 

6=DTR Options

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

4=Quick setup

 

 

 

 

 

7=DSR Options

 

1=Data Bits

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

5=Remote config

 

 

 

 

 

8=Flow Control

 

 

 

 

 

 

 

 

 

 

 

 

2=Parity Bits

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

9=Data Format

 

 

 

 

 

 

 

 

 

 

 

 

3=Stop Bits

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1=8 Data Bits

2=7 Data Bits

1=None

2=Odd

3=Even

1=1 Stop bit 2=1.5 Stop bits 3=2 Stop bits

Figure 6-18

Data Format Menu Tree

Transmit Clock (Synchronous Data Format)

Selecting the Normal option causes the ISU 128 to be the synchronous DTE interface transmit timing source. Transmit data is timed from the transmit clock provided by the ISU 128 on the DTE connector. Normal clock is the normal mode of operation for the ISU 128.

With the External option selected, the ISU 128 slaves to an external transmit timing source. The external clock is provided to the ISU 128 by the external transmit clock signal at the DTE connector. This signal is echoed by the ISU 128 to the transmit clock signal on the DTE connector.

This option provides for situations where equipment connected to the ISU 128 DTE connector cannot slave to the ISU 128 provided clock. The ISU 128 uses the U-interface as the frequency standard when it must provide a synchronous receive or transmit clock. The externally provided clock must be of the same average frequency as the clock that the ISU 128 would provide if internal clock were selected. If this is not the case, then bit errors may occur.

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Chapter 6. Configuration

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Chapter 7

Protocol Options

PROTOCOL OPTIONS

The ISU 128 communicates with many different types of telecommunication equipment including other ISU 128s, ISDN terminal adapters, Switched 56 DSUs, BONDING-compatible inverse multiplexers, and V.34 (1202029L3 only) compatible analog modems. Communicating between such diverse types of equipment requires the use of various rate adaptation protocols to support various bit rates and DTE settings. Figure 7-1 illustrates the menu tree for setting protocol options. The ISU 128 supports the following rate adaptation protocols:

Clear Channel (no rate adaption protocol)

BONDING mode 1 (Bandwidth on Demand Interoperability Group)

CCITT V.120

CCITT V.110

V.34 (for communicating with analog modems)

V.34 is only available in PN 1202029L3

DSU 56.7 Async (for communication with ADTRAN DSUs)

TLINK (Dial Switched 2-wire 56 or Datapath DSU)

SAP (Simple ADTRAN Protocol)

FALLBACK

Point-to-point protocol (PPP) asynchronous to synchronous conversion

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Chapter 7. Protocol Options

 

 

 

 

 

 

 

 

1=Clear Channel

 

 

 

 

1=Netw. options

 

 

 

2=BONDING mode 1

 

 

 

 

 

 

 

 

 

 

3=CONFIG

 

2=DTE options

 

 

 

3=V.120

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3=Protocol

 

 

 

4=V.34

 

 

 

 

4=Quick setup

 

 

 

5=V.110

 

 

 

 

5=Remote config

 

 

 

 

 

 

 

 

 

 

 

 

 

6=DSU 57.6 ASYNC

 

 

 

 

 

 

 

 

7=T-LINK

 

 

 

 

 

 

 

 

 

8=SAP

 

 

 

 

 

 

 

 

9=FALLBACK

 

 

 

 

 

 

 

 

0=PPP asyn-sync

 

 

 

 

 

 

 

 

 

 

 

Figure 7-1

Protocol Menu Tree

See the section Recommended Operating Protocols and Table 1-B in Chapter 1 for more information on recommended modes of operation.

The desired protocol may be selected with AT commands at the DTE port or from the ISU 128 front panel. A description of each protocol follows.

Clear Channel

Clear Channel provides the entire bearer channel to the DTE without regard to data format or protocol. This provides a rate adaptation at or near the ISDN circuit rate. The primary usage for Clear Channel in the dial line mode is for 56 kbps and 64 kbps synchronous. It is useful when the DTE performs its own internal synchronous protocol/rate adaptation or the ISU 128 is calling a 4- wire Switched 56 DSU. In the leased line mode, Clear Channel can provide synchronous bit rates of 56 kbps, 64 kbps, 112 kbps, and 128 kbps.

BONDING Mode 1

The BONDING mode 1 protocol allows the ISU 128 to communicate at bit rates in excess of 64 kbps to a maximum of 128 kbps. BONDING provides high-speed communication between ISU 128s, ISDN TE/TAs, and inverse multiplexing equipment supporting the BONDING protocol. The protocol allows use of both synchronous and asynchronous bit rates. When the ISU 128 uses the BONDING mode 1 protocol, it must make two separate ISDN phone calls to seize control of both ISDN bearer channels. The protocol corrects any delays existing between the two bearer channels and presents a single high speed data channel to the DTE. For successful high-speed operation, both the

48

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Chapter 7. Protocol Options

nearand far-end DCE need to be configured to use the BONDING mode 1 protocol. Also, if the second B channel number is different from the first B channel, it is important that the 7-digit LDN is programmed in the answering unit. The BONDING mode 1 protocol negotiation phase has numerous timers to allow for transmission delays due to satellite hops, international calls, etc. The timers may be adjusted if necessary by entering into the BONDING mode 1 submenu. Figure 7-2 illustrates the menu path for setting the timers.

 

 

 

 

 

 

 

 

 

 

 

 

1=TXINIT

 

 

 

 

 

 

 

 

 

1=Clear Channel

2=TXFA

 

 

 

 

 

 

 

 

 

3=TXADD01

 

 

 

1=Netw. options

 

 

 

2=BONDING mode 1

 

 

 

 

 

 

 

 

 

4=TXDEQ

 

3=CONFIG

 

2=DTE options

3=V.120

 

 

 

 

 

 

 

 

 

 

 

 

5=TANULL

 

 

 

3=Protocol

4=V.34

 

 

 

 

4=Quick setup

 

 

5=V.110

6=TCID

 

 

 

 

 

 

 

 

7=BONDING Method 1=ADTRAN Only

 

 

 

5=Remote config

 

6=DSU 57.6 ASYNC

 

 

 

 

 

 

 

 

 

7=T-LINK

 

2=Multivendor

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

8=SAP

 

 

 

 

 

 

 

 

 

 

9=FALLBACK

 

 

 

 

 

 

 

 

 

 

0=PPP asyn-sync

 

Figure 7-2

BONDING Mode 1 Protocol Menu Tree

The timers are defined as follows:

TXINIT

This option specifies the length of time the originating endpoint attempts to detect the BONDING negotiation pattern from the answering endpoint before deciding the BONDING call has failed. In general, this timer value should be left at the factory default setting of 10 seconds. Values of 1, 2, 5, 10 (default), 20, 50, 100, and 200 seconds may be selected.

TXFA

This option specifies the length of time both endpoints attempt to detect the BONDING frame pattern when a call is connected before deciding the BONDING call has failed. This timer value should be left at the factory default setting of 10 seconds. However, when interoperating with other manufacturers’ BONDING equipment, it may be necessary to lengthen this timer so that it matches TXADD01. Values of 1, 2, 5, 10 (default), 20, 50, 100, and 200 seconds may be selected.

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Chapter 7. Protocol Options

TXADD01

This option specifies the length of time both endpoints wait for the additional call to be connected at the end of negotiation before deciding the BONDING call has failed. The factory default setting of 20 seconds will be sufficient for most calls to go through, although when dialing overseas it may be necessary to lengthen this timer to allow for slower call routing. Values of 1, 2, 5, 10, 20, 50 (default), 100, and 200 seconds may be selected.

TXDEQ

This option specifies the length of time both endpoints attempt to equalize the network delay between the bearer channels before deciding the BONDING call has failed. The default setting is 50 seconds. Values of 1, 2, 5, 10, 20, 50 (default), 100, and 200 seconds may be selected.

TANULL

This option specifies the length of time the answering endpoint attempts to detect the BONDING negotiation pattern from the originating endpoint before aborting to clear channel mode. In general, this timer value should be left at the factory default setting of 10 seconds. However, it may be necessary to shorten this timer, if the DTE equipment connected to the ISU also has timer constraints for completing non-BONDING parameter negotiation. Values of 1, 2, 5, 10 (default), 20, 50, 100, and 200 seconds may be selected.

TCID

This option specifies the length of time both endpoints attempt to negotiate an agreeable value for bearer channels and channel capacities before deciding the BONDING call has failed. This timer default setting is 5 seconds. Values of 1, 2, 5 (default), 10, 20, 50, 100, and 200 seconds may be selected.

V.120

The V.120 protocol is a CCITT compliant rate adaption method which provides DTE service between the ISU 128 and other V.120 compliant devices at rates less than the 64 kbps ISDN bearer channel rate. V.120 supports synchronous and asynchronous DTE rates. See the section Recommended Operating Modes and Table 1-B in Chapter 1 for available V.120 rates. Figure 7-2 illustrates the menu path for selecting V.120.

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Chapter 7. Protocol Options

V.110

The V.110 protocol is a CCITT compliant rate adaption method which provides DTE service between the ISU 128 and other V.110 compliant devices. V.110 supports synchronous and asynchronous DTE rates. See the section

Recommended Operating Modes and Table 1-B in Chapter 1 for available V.110 rates. Figure 7-2 illustrates the menu path for selecting V.110.

V.34

The V.34 protocol allows the ISU to originate and receive calls to analog modems on POTS lines. The V.34 modem only supports asynchronous DTE rates. To place an outgoing call to an analog modem, the call type must be changed to Audio. See Call Type in Chapter 6 to change call types. Figure 7-3 illustrated the menu path for selecting the V.34 modem operational parameters.

The ISU 128 with optional V.34 modem (part number 1202029L3) must be used for operation of this protocol.

Error Control

This option sets the type of error control to be negotiated with the far-end modem during train-up. Normal turns all error control off and makes allowances for flow control. Reliable MNP uses MNP error control. If the far end does not support MNP then the call is terminated. When Auto-Rel MNP is selected, the ISU 128 attempts to use MNP error control. If the far end does not use MNP then normal operation is used. Force LAPM allows only LAPM (V.42) error corrected calls to connect. Force MNP allows only MNP error corrected calls to connect.

 

 

 

 

 

 

 

 

 

1=Clear Channel

 

 

 

 

 

 

 

 

1=Netw. options

 

2=BONDING mode 1

 

 

 

1=Normal

 

3=CONFIG

 

2=DTE options

3=V.120

 

 

 

 

 

 

2=Direct

 

 

 

 

3=Protocol

 

 

 

 

4=V.34

 

 

1=Error Ctrl

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3=Reliable MNP

 

 

 

 

4=Quick setup

 

5=V.110

 

2=Compression

 

 

 

 

4=Auto-Rel MNP

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

5=Remote config

6=DSU 57.6 ASYNC

3=MNP Blk Size

 

 

 

 

5=Force LAPM

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

7=T-LINK

 

 

 

 

 

 

 

 

 

 

 

 

 

 

6=Force MNP

 

 

 

 

 

 

 

 

 

8=SAP

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

9=FALLBACK

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0=PPP asyn-sync

 

 

 

 

 

Figure 7-3

V.34 Error Control Menu Tree

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Chapter 7. Protocol Options

Compression

No Compression turns off the MNP5 compression algorithms in the ISU 128. Compress MNP5 enables MNP5 data compression. Compress V42 enables V.42 bis data compression. Compress V42/MNP5 allows the 128 to negotiate MNP5 or V.42 bis compression.

 

 

 

 

 

 

 

 

 

1=Clear Channel

 

 

 

 

 

 

 

 

1=Netw. options

 

2=BONDING mode 1

 

 

 

1=No Compression

 

 

3=CONFIG

 

2=DTE options

3=V.120

 

 

 

 

 

 

2=Compress MNP5

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3=Protocol

 

 

 

 

4=V.34

 

 

 

1=Error Ctrl

 

 

 

 

 

 

 

 

 

 

 

 

3=Compress V42

 

 

 

 

 

4=Quick setup

5=V.110

2=Compression

 

 

 

 

 

 

4=Comp V42 MNP5

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

5=Remote config

6=DSU 57.6 ASYNC

 

3=MNP Blk Size

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

7=T-LINK

 

 

 

 

 

 

 

 

 

 

 

 

 

 

8=SAP

 

 

 

 

 

 

 

 

 

 

 

 

 

9=FALLBACK

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0=PPP asyn-sync

 

 

 

 

 

Figure 7-4

V.34 Compression Menu Tree

Microcom™ Network Protocol Block Size (MNP® Blk)

When error control is enabled, this option sets the amount of data sent in a single packet during MNP error-controlled stream operation. Options available are 64, 128, 192, and 256 bytes.

 

 

 

 

 

 

 

 

 

 

1=Clear Channel

 

 

 

 

 

 

 

1=Netw. options

2=BONDING mode 1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3=CONFIG

 

2=DTE options

3=V.120

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1=Error Ctrl

 

 

 

 

 

 

3=Protocol

4=V.34

 

 

 

 

 

 

 

 

 

4=Quick setup

5=V.110

2=Compression

 

 

 

 

 

 

5=Remote config

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

6=DSU 57.6 ASYNC

3=MNP Blk Size

 

1=64 bytes

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

7=T-LINK

 

 

 

2=128 bytes

 

 

 

 

 

 

 

 

 

 

8=SAP

 

 

3=192 bytes

 

 

 

 

 

 

 

 

 

 

9=FALLBACK

 

 

4=256 bytes

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0=PPP asyn-sync

 

 

 

 

Figure 7-5

V.34 MNP Block Size Menu Tree

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Chapter 7. Protocol Options

DSU 57.6 ASYNC

The DSU 57.6 ASYNC or DSTOP protocol allows the ISU 128 to communicate asynchronously at 57.6 kbps with ADTRAN 2- and 4-wire Switched 56 DSU products. In addition, the ISU 128 will communicate with other ISUs over dial and leased connections using this protocol. Figure 7-1 illustrates the menu path for setting the DSU 57.6 ASYNC protocol.

T-Link

The T-Link protocol allows the ISU 128 to communicate with 2-wire Switched 56 DataPath Data Units (DUs) such as the ADTRAN DSU III 52W. The T-Link protocol performs two functions:

The T-link protocol adapts DTE data subrates of 64 kbps to the 64 kbps bandwidth of the ISDN bearer channel.

For asynchronous and synchronous DTE rates up to 19.2 kbps, T-Link transmits the status of the DCE-DTE EIA leads to facilitate flow control and maintenance.

In addition to 2-wire Switched 56 DataPath DUs, the ISU 128 can communicate with any other device that uses the T-Link protocol. Figure 7-1 shows the menu path for selecting T-Link.

Simple ADTRAN Protocol (SAP)

Simple ADTRAN Protocol (SAP) is a rate adaption method providing DTE service between ISU 128 units at a sub 64 kbps ISDN bearer channel rate. Selecting this menu item causes the ISU 128 to use SAP protocol.

The primary usage for SAP is general purpose asynchronous rate adaption in a dial-up or leased environment. SAP only operates on a 64 kbps data link. See Figure 7-2 for the menu path to select SAP.

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Chapter 7. Protocol Options

FALLBACK

The FALLBACK asynchronous rate adaption protocol provides the capability to automatically establish calls with other ISDN terminal adapters, Switched 56 DSUs, V.34 modems (optional), as well as other ISUs using a single configuration. To communicate with analog modems, the ISU 128 with V.34 modem option (part numbers 1202029L3) must be used.

The ISU 128 must be optioned as follows for FALLBACK operation:

Any asynchronous bit rate up to 115.2 kbps which is supported by the DTE.

Flow control must be enabled and supported by the DTE.

FALLBACK supports the following protocols based on the call type: BONDING Mode 1, V.120, T-Link, and V.34.

When answering calls, the ISU 128 uses the incoming call type to determine which rate adaption protocols to support. See Table 7-A for the call type and the supported rate adaption protocols.

 

 

Table 7-A

 

 

Rate Adaption Protocols

 

 

 

 

Call Type

Rate Adaption

Typical Units Supported

 

Protocols Supported

 

 

 

 

 

 

 

 

Data 64k

BONDING Mode 1

ISUs

 

 

V.120

ISDN TAs

 

 

PPP

PPP compatible bridges/routers

 

Data 56k

V.120

ISDN TAs

 

 

T-Link

2-Wire Switched-56 DSUs

 

 

PPP

PPP compatible bridges/routers

 

Speech or Audio

V.34

V.34 compatible modems

 

 

 

 

 

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Chapter 7. Protocol Options

When originating calls to unknown units, the ISU begins protocol selection based on the local call type. Data 64k is used for FALLBACK selected from Quick Setup menu. Upon connection at 64k call type, BONDING, V.120, and PPP are attempted. If connection is not made at 64k, the ISU 128 attempts another call at 56k call type. If connection is made at 56k, then V.120, T-Link, and PPP are attempted. If connection is not made at 56k, then an audio call type is attempted, provided the ISU 128 with the V.34 modem option is used. If the ISU connects the audio call type, the V.34 protocol is attempted for V.34 compatible modems. Once a call connects, if the protocol cannot be negotiated, the protocol is negotiated as specified by S11 register (default is DSTOP). If this protocol fails, the call is disconnected.

If FALLBACK fails to determine which protocol is running, the user has the option to select which protocol will run. Figure 7-6 illustrates the FALLBACK default settings.

 

 

 

 

 

 

 

 

 

1=Clear Channel

 

 

 

 

 

 

 

 

 

1=Netw. options

 

 

 

 

2=BONDING mode 1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3=CONFIG

 

2=DTE options

 

 

 

 

3=V.120

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3=Protocol

 

 

 

 

4=V.34

 

 

 

 

 

 

 

 

 

4=Quick setup

 

 

 

 

5=V.110

 

 

 

 

 

 

 

 

 

5=Remote config

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

6=DSU 57.6 ASYNC

 

 

 

1=Clear Channel

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

7=T-LINK

 

 

 

2=BONDING Mode 1

 

 

 

 

 

 

 

 

 

8=SAP

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3=V.120

 

 

 

 

 

 

 

 

 

 

9=FALLBACK

 

 

1=Fallback Def.

 

4=V.34

 

 

 

 

 

 

 

 

 

 

0=PPP asyn-sync

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

5=V.110

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

6=DSU 57.6 ASYNC

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

7=T-LINK

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

8=SAP

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

9=PPP asyn-sync

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Figure 7-6

FALLBACK Menu Tree

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Chapter 7. Protocol Options

Point-to-Point (PPP) Async-to-Sync

PPP provides a standard method for transporting multi-protocol datagrams over point-to-point links. The ADTRAN PPP async-sync protocol allows the ISU 128 and a PC or Macintosh® running PPP software, to communicate with a PPP-compatible bridge or router. The PPP async-sync protocol complies with Internet Engineering Task Force (IETF) RFC 1662. The menu path to select PPP is shown in Figure 7-7.

The asynchronous control character map (ACCM) option is scanned during the negotiation. When the ACCM option is seen in a configure ACK link control packet, it is adopted by the ISU 128. In addition, when the ACCM option is not seen in the configure-request packet from the network, the ISU 128 adds it to the packet.

 

 

 

 

 

 

 

 

 

 

1=Clear Channel

 

 

 

 

 

 

 

 

1=Netw. options

2=BONDING mode 1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3=CONFIG

 

2=DTE options

3=V.120

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3=Protocol

4=V.34

 

 

 

 

 

 

 

 

4=Quick setup

 

5=DSU 57.6 ASYNC

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

5=Remote config

 

 

6=T-LINK

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

7=SAP

 

 

 

 

 

 

 

 

 

 

 

 

 

 

8=FALLBACK

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

9=PPP asyn-sync

 

 

1=METHOD

 

1=PPP

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2=Multilink PPP

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3=PPP w/ Comp

Figure 7-7

PPP Menu Tree

Point-to-Point Protocol (PPP)

The ISU 128 is configured for PPP from the protocol options of the configuration menu by selecting 1=PPP or by setting S-register S27 to a value of 0. Figure 7-6 illustrates the menu path for setting PPP, Multilink PPP, and PPP w/ Comp.

Multilink Point-to-Point Protocol (MP)

Multilink PPP is an extension of point-to-point protocol and is a method for splitting and recombining data packets across multiple logical data links.

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Chapter 7. Protocol Options

The ISU 128 is configured for multilink PPP from the protocol options of the configuration menu by selecting 2=Multilink PPP or by setting S-register S27 to a value of 1. In this mode, the ISU 128 dials a second number to establish a second point-to-point link. Once the second link is established, multilink PPP is performed over both B-channels.

The phone number for the second call should be placed in stored number 1 (SN1). If no number is stored in SN1, the same phone number is dialed to establish the second link.

PPP with Compression

The ISU 128 is configured for PPP with compression from the protocol options of the the configuration menu by selecting 3=PPP w/Comp or by setting S-reg- ister S27 to a value of 2.

When setup for PPP with compression, the ISU 128 will negotiate the compression control protocol (CCP) with the network PPP peer. If STAC™ compression is successfully negotiated with the peer, data packets from the DTE are compressed before being sent out through the network. Likewise, compressed packets from the network are decompressed before being transmitted through the DTE.

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Chapter 7. Protocol Options

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Chapter 8

Quick Setup

QUICK SETUP CONFIGURATION

To configure the DTE Options quickly and easily, the Quick Setup menu is available to automatically set up the most common DTE configurations (Figure 8-1). For fine-tuning a particular application and DTE settings, see the section DTE Options for Asynchronous and Synchronous Operation in Chapter 6 for a step-by-step procedure for configuration of the DTE Options.

 

 

 

1=Netw. options

 

 

 

1=Dial 56K sync

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2=Dial 64K sync

 

 

 

 

2=DTE options

 

 

 

 

 

3=CONFIG

 

 

 

 

 

 

 

3=Dial 112K sync

 

 

 

 

3=Protocol

 

 

 

 

 

 

 

 

 

 

4=Dial 128K sync

 

 

 

 

 

 

 

 

 

 

 

 

4=Quick setup

 

 

 

 

 

 

 

5=Dial PPP

 

 

 

 

 

 

 

 

 

 

 

 

5=Remote config

 

 

 

 

 

 

 

 

 

 

6=V34 115.2 async

1=Leased 128k

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

7=Dial 57.6 asyn

 

 

 

 

 

 

 

2=Ldm 128 Master

 

 

 

 

 

 

 

8=Dial 115.2 asy

 

 

 

 

 

 

 

3=TBD

 

 

 

 

 

 

 

9=Fallback 57.6k

 

 

 

 

 

 

 

4=TBD

 

 

 

 

 

 

 

0=More

 

 

 

 

 

 

 

5=TBD

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

6=TBD

 

 

 

 

 

 

 

 

7=TBD

 

 

 

 

 

 

 

 

 

Figure 8-1

Quick Setup Menu Tree

Option 1=DIAL 56K sync will always flash upon entry of the Quick Setup Menu regardless of previous configuration selections.

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Chapter 8. Quick Setup

Quick Setup

To assist in configuring the DTE options for the ISU 128, ten common configurations are preset in Quick Setup. These include:

Synchronous dial operation for 56, 64, 112, and 128 kbps

Asynchronous dial operation for 57.6, and 115.2 kbps

128 kbps Leased service

128 kbps Limited Distance Modem using Master Clocking

V.34 modem service

Fallback 57.6

In the following descriptions, an asterisk (*) following the option indicates the option requires ISDN switch protocol to be configured. Multipoint lines will also require SPID1 & LDN1. See the chapter Dial Options.

Dial 56K sync*

When the ISU 128 is configured for Dial 56K sync service, the following parameters are automatically preset:

Service type.......................................................................

ISDN dial line

Automatic answering......................................................

Enabled

ISDN call type ..................................................................

56 kbps data

Data protocol ....................................................................

Clear Channel

DTE mode .........................................................................

Synchronous

DTE connector bit rate ....................................................

56 kbps

DTE flow control..............................................................

none

RTS line .............................................................................

1 ms delay

CTS line .............................................................................

Forced on

Transmit data clock .........................................................

Normal clock source

V.54 Loopbacks ................................................................

Accepted

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Chapter 8. Quick Setup

Dial 64K sync*

When the ISU 128 is configured for Dial 64K sync service the following parameters are automatically preset:

Service type.......................................................................

ISDN dial line

Automatic answering......................................................

Enabled

ISDN call type ..................................................................

64 kbps data

Data protocol ....................................................................

Clear Channel

DTE mode .........................................................................

Synchronous

DTE connector bit rate ....................................................

64 kbps

DTE flow control..............................................................

none

RTS line..............................................................................

1 msec delay

CTS line .............................................................................

Forced on

Transmit data clock .........................................................

Normal clock source

V.54 Loopbacks ................................................................

Accepted

Dial 112K sync*

When the ISU 128 is configured for Dial 112K sync service, the following parameters are automatically preset:

Service type.......................................................................

ISDN dial line

Automatic answering......................................................

Enabled

ISDN call type ..................................................................

56 kbps data

Data protocol ....................................................................

BONDING mode 1

DTE mode .........................................................................

Synchronous

DTE connector bit rate ....................................................

112 kbps

DTE flow control..............................................................

none

RTS line..............................................................................

1 ms delay

CTS line .............................................................................

Forced on

Transmit data clock .........................................................

Internal clock source

BONDING timer TXINIT ...............................................

10 seconds

BONDING timer TXFA...................................................

10 seconds

BONDING timer TXADD01...........................................

50 seconds

BONDING timer TXDEQ ...............................................

50 seconds

BONDING timer TANULL ............................................

10 seconds

BONDING timer TCID ...................................................

5 seconds

V.54 Loopbacks ................................................................

Accepted

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Chapter 8. Quick Setup

Dial 128K sync*

When the ISU 128 is configured for Dial 128K sync service, the following parameters are automatically preset:

Service type.......................................................................

ISDN dial line

Automatic answering......................................................

Enabled

ISDN call type ..................................................................

64 kbps data

Data protocol ....................................................................

BONDING mode 1

DTE mode .........................................................................

Synchronous

DTE connector bit rate ....................................................

128 kbps

DTE flow control..............................................................

None

RTS line .............................................................................

1 ms delay

CTS line .............................................................................

Forced on

Transmit data clock .........................................................

Internal clock source

BONDING timer TXINIT ...............................................

10 seconds

BONDING timer TXFA...................................................

10 seconds

BONDING timer TXADD01...........................................

50 seconds

BONDING timer TXDEQ ...............................................

50 seconds

BONDING timer TANULL ............................................

10 seconds

BONDING timer TCID ...................................................

5 seconds

V.54 Loopbacks ................................................................

Accepted

Dial PPP*

When the ISU 128 is configured for Dial PPP service, the following parameters are automatically preset:

Service type.......................................................................

ISDN dial line

ISDN call type ..................................................................

64 kbps data

Data Protocol ....................................................................

PPP asyn-sync

DTE mode .........................................................................

Asynchronous

Data Bits ............................................................................

8

Parity Bits..........................................................................

None

Stop Bits.............................................................................

1

DTE connector bit rate ....................................................

Hardware

DTE flow control..............................................................

None

RTS line .............................................................................

1 msec delay

CTS line .............................................................................

Follow RTS

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Chapter 8. Quick Setup

V34 115.2 async*

When the ISU 128 is configured for V34 115.2 async service, the following parameters are automatically preset:

Service type.......................................................................

ISDN dial line

ISDN call type ..................................................................

Audio

Data Protocol ....................................................................

V.34

DTE mode .........................................................................

Asynchronous

Data Bits ............................................................................

8

Parity Bits ..........................................................................

None

Stop Bits.............................................................................

1

DTE connector bit rate ....................................................

115.2 kbps

DTE flow control..............................................................

Hardware

RTS line..............................................................................

1 msec delay

CTS line .............................................................................

Follows RTS

Error Control ....................................................................

Auto-reliable

Compression.....................................................................

Compress V42/MNP5

MNP block size ................................................................

256 bytes

This option is only used with the ISU 128 with V.34 modem option (part numbers 1202029L3).

Dial 57.6 asyn*

When the ISU 128 is configured for Dial 57.6 asyn service, the following parameters are automatically preset:

Service type.......................................................................

ISDN dial line

ISDN call type ..................................................................

64 kbps data

Data Protocol ....................................................................

V.120

DTE mode .........................................................................

Asynchronous

Data Bits ............................................................................

8

Parity Bits ..........................................................................

None

Stop Bits.............................................................................

1

DTE connector bit rate ....................................................

57.6 kbps

DTE flow control..............................................................

None

RTS line..............................................................................

1 msec delay

CTS line .............................................................................

Forced on

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Chapter 8. Quick Setup

Dial 115.2 asyn*

When the ISU 128 is configured for Dial 115.2 asyn service, the following parameters are automatically preset:

Service type.......................................................................

ISDN dial line

ISDN call type ..................................................................

64 kbps data

Data Protocol ....................................................................

BONDING mode 1

DTE mode .........................................................................

Asynchronous

Data Bits ............................................................................

8

Parity Bits..........................................................................

None

Stop Bits.............................................................................

1

DTE connector bit rate ....................................................

115.2 kbps

DTE flow control..............................................................

Hardware

RTS line .............................................................................

1 msec delay

CTS line .............................................................................

Follows RTS

Fallback 57.6k*

When the ISU 128 is configured for Fallback 57.6k service, the following parameters are automatically preset:

Service type.......................................................................

Dial line

Automatic answering......................................................

yes

ISDN call type ..................................................................

64 kbps data

Data Protocol ....................................................................

Fallback

DTE mode .........................................................................

Asynchronous

Data Bits ............................................................................

8

Parity Bits..........................................................................

None

Stop Bits.............................................................................

1

DTE connector bit rate ....................................................

57.6 kbps

DTE flow control..............................................................

Hardware

RTS line .............................................................................

1 msec delay

CTS line .............................................................................

Follows RTS

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Chapter 8. Quick Setup

More

More takes the user into the following level of choices:

Leased 128K

When the ISU 128 is configured for Leased 128K service the following parameters are automatically preset:

Service type.......................................................................

Leased Line

Network clock source......................................................

Slave

Channel rate......................................................................

128K

Data Protocol ....................................................................

Clear Channel

DDS loopbacks enabled ..................................................

Yes

DTE mode .........................................................................

Synchronous

DTE connector bit rate ....................................................

128 kbps

DTE flow control..............................................................

none

RTS line..............................................................................

1 msec delay

CTS line .............................................................................

Forced on

Transmit data clock .........................................................

Normal clock source

Ldm 128 Master

When the ISU 128 is configured for a point-to-point application such as a limited distance modem (LDM) arrangement, the Ldm 128 Master option automatically presets the following parameters:

Service type.......................................................................

Leased Line

Network clock source......................................................

Master

Channel rate......................................................................

128K

Data Protocol ....................................................................

Clear Channel

DDS loopbacks enabled ..................................................

Yes

DTE mode .........................................................................

Synchronous

DTE connector bit rate ....................................................

128 kbps

DTE flow control..............................................................

none

RTS line..............................................................................

1 msec delay

CTS line .............................................................................

Forced on

Transmit data clock .........................................................

Normal clock source

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Chapter 8. Quick Setup

Factory Setup

This option restores the ISU 128 to the factory default setup:

Service type................................................................

ISDN dial line

ISDN switch protocol ...............................................

AT&T 5ESS

ISDN call type ...........................................................

64 kbps data

Dialing Mode.............................................................

Front Panel

Data protocol .............................................................

Clear Channel

DTE connector bit rate .............................................

64 kbps

DTE flow control.......................................................

none

RTS line ......................................................................

Forced on

CTS line ......................................................................

Forced on 1 msec after RTS

CD line........................................................................

Turned on when call is up

DSR line......................................................................

Forced on

Transmit data clock ..................................................

Internal clock source

BONDING timer TXINIT ........................................

10 seconds

BONDING timer TXFA............................................

10 seconds

BONDING timer TXADD01....................................

10 seconds

BONDING timer TXDEQ ........................................

50 seconds

BONDING timer TANULL .....................................

50 seconds

BONDING timer TXID ............................................

5 seconds

AT Commands Escape character............................

+

End-of-Line character value ....................................

13

Line Feed character value........................................

10

Backspace character value .......................................

8

Transmit Data Clock.................................................

Normal clock source

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Chapter 9

Dial Options

DIALING OPTIONS

Selecting 4=DIAL or pressing the #(pound) key from the Current Status menu displays the front panel available dialing options. (See Figure 9-2.) Access the VT 100 terminal dial options screen (Figure 9-1) by pressing Ctl-D from any screen. The dial options are only available when the ISU is configured for Dial Line operation (not Leased Line).

Figure 9-1

VT 100 Terminal Dial Options Screen

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Chapter 9. Dial Options

1=Hang up line 2=Dial number

 

4=DIAL

 

 

3=Redial last #

 

 

 

 

 

 

 

 

4=Answer Call

 

 

 

 

5=Dial stored #

 

 

 

 

 

6=Store/Review #

Figure 9-2

Dial Menu Tree

Hang Up Line

Terminates current call.

Dial Number

Enter and dial a number from the keypad. If an error is made while entering a number, press the Down arrow to correct the mistake. Press Cancel twice consecutively to exit this menu item without dialing a number. Press Enter to dial the number and save as stored number 9 for redialing purposes.

Redial Last Number

Redial the last number called (or attempted). This number is saved as stored number 9 from the last attempted phone call.

Answer Call

Selectively answer incoming calls when Auto Answer is configured for disable. (Auto Answer is described in the section Auto Answer in Chapter 6.)

Dial Stored Number

Dial one of ten stored phone numbers. The Up and Down arrows permit viewing and selecting of stored number. Press Enter to dial the number and save as stored number 9 (SN9) for redial purposes.

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Chapter 9. Dial Options

Store/Review Number

Enter and review stored numbers. Press the Up or Down arrow to scroll through the 10 stored numbers (SN0 - SN9). To store a number, scroll to the desired stored number location, enter the number to be stored, and press Enter to save the number. If a mistake is made, use the Up and Down arrows to edit the number. Press Enter to save the number and exit. Press Cancel to exit without changing the number.

The Dial Options Menu must be exited after dialing in order for CD (carrier detect) to be activated.

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Chapter 9. Dial Options

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Chapter 10

Remote Configuration

Remote Configuration

Remote Configuration allows configuration and testing of a remote unit by calling the remote unit from a local unit. The remote unit can be configured using AT commands, the Front Panel, or the VT 100 terminal interface.

There are six items that cannot be set through remote configuration. The items are Dial Line Mode, SPID(s), LDN(s), Switch Type, Quick Setup, and Factory Default.

Configuring with AT Commands

A remote unit can be configured by issuing an ATD command with the phone number of the remote unit plus a dial string modifier. The configuration command syntax is:

ATD nnnnnnn#6#yyyyyy

Where nnnnnnn is the remote number to call, and yyyyyy is a password of up to six digits.

After the connection is established, AT commands issued to the local unit are sent to the remote unit and executed. The remote unit sends response back to the local unit which then sends the response out of the DTE interface connector. See the appendices AT Commands and S-Registers of the ISU 128 manual for a complete list of commands.

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Chapter 10. Remote Configuration

Configuring and Testing with the Front Panel or VT 100 Terminal

The menu path to follow to select remote configuration on the Front Panel is shown in Figure 10-1.

1=Netw. options

2=DTE options 3=CONFIG 3=Protocol

4=Quick setup

5=Remote config 1=Cfg. Rmt. Unit

2=Set Password 3=Loopback remote 1B 4=Loopback remote 2B

Figure 10-1

Remote Configuration Menu Path

When using the VT 100 terminal interface, select the main menu option Cfg. Rmt. Unit. The Remote Configuration screen appears as shown in Figure 10-2.

Figure 10-2

Remote Configuration Screen

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Chapter 10. Remote Configuration

Configure Remote Unit

This option allows configuration of a remote ISU 128. The Front Panel will display a prompt for the remote number to dial. Enter a number and press Enter to continue. A prompt for the remote password is displayed. Enter up to six digits for the password to access the remote unit and press Enter to continue. The Front Panel displays status information about the call. When a connection is established, the Front Panel will display information as if it were the remote unit. If the connection was not successful, the Front Panel displays information for the local unit connection. Pressing Cancel anytime up to this point cancels the call. Pressing Cancel at the first remote display screen or selecting Hang up line disconnects the call.

Figure 10-2 illustrates the VT 100 terminal screen when Cfg. Rmt. Unit is selected from the main menu. Enter the remote number to call and press Enter. When prompted, enter the password and press Enter. If a password has not been set for accessing the remote unit, press Enter. The VT 100 terminal will first display the Status Menu screen as it attempts to connect to the remote unit. Once successfully connected, the terminal will change back to the Configuration Menu screen and display remote information as if the remote unit were connected to the VT 100 terminal. Figure 10-3 illustrates the terminal screen when connected to a remote ISU 128. The call may be terminated by selecting Hang up line from the Dial menu.

Figure 10-3

Remote Unit Configuration Screen

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Chapter 10. Remote Configuration

The Front Panel can only be used to configure other ISU devices with front panels. AT commands and the VT 100 terminal can be used to configure any ISU device that supports remote configuration, such as the Express XR/XRT and the ISU 2x64 Rackmount.

Remote Testing

Two tests may be performed from the local unit before connecting to the remote unit. Figure 10-4 illustrates the menu path for choosing Loopback Remote 1B and Loopback Remote 2B from the Test menu on the front panel.

1=Loopback DTE

2=Loopback Netw. 2=TEST 3=Loopback Proto

4=Loopback Remote 5=Test Remote

6=Lpbk Disable

7=NEBE/FEBE

0=Software Ver

Figure 10-4

Test Menu Path

Loopback Remote 1B

The Lpbk Remote 1B option allows a local unit to call, loopback, and BERT test a remote unit on one B-channel if both the local and remote units are configured for Fallback protocol. The Front Panel and VT 100 terminal will prompt for the remote number to dial. When a connection is established, error information is displayed. Press 1) Exit Test or Escape to exit the test. Figure 10-5 illustrates the VT 100 terminal while testing Loopback Remote 1B.

Loopback Remote 2B

The Lpbk Remote 2B option allows a local unit to call, loopback, and BERT test a remote unit on two B-channels if both the local and remote units are configured for Fallback protocol. The Front Panel and VT100 terminal will prompt for the remote number to dial. When a connection is established, error information will be displayed. Press 1) Exit Test or Escape to exit the test.

Set Password

The Set Password option allows the user to store a password up to six digits for remote configuration access. If a password is entered, any other unit used to configure this unit remotely must send a password matching the stored password. If passwords do not match, the remote configuration fails to

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Chapter 10. Remote Configuration

connect. The screen from a VT 100 terminal is illustrated in Figure 10- 6. To set the password, choose Set Password from the Main Configuration Menu. Type the six digit (or less) password, then press Enter. To clear the existing password, do not enter numbers for Set Password. Just press enter.

Figure 10-5

Loopback Remote 1B

Figure 10-6

Set Password Screen

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Chapter 10. Remote Configuration

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Chapter 11

Troubleshooting

When the ISU 128 powers up, it performs an internal self test. This takes about 10 seconds. At the end of the test, the front panel displays Self Test Passed.

IF SELF TEST FAILS

If Self Test Passed is not displayed, perform the following procedure to verify if the problem can be fixed locally:

1.Ensure that the ISU 128 is receiving power and is switched on.

2.Turn off the ISU 128. While holding down the 0 key, power back on. Continue to press 0 for 15 seconds. This will reset all the internal settings to factory defaults.

3.If the ISU 128 still does not pass self test, call ADTRAN Technical Support for assistance. See the back of this manual for phone numbers.

IF THE ISU 128 DOES NOT READ READY

When the ISU 128 has been set up and connected to an ISDN line but the front panel does not read Ready after a few minutes, use the following troubleshooting procedure:

1.Cycle power on the ISU 128, leaving it off for a minimum of two seconds. Turn the power on for one minute to ensure the unit does not read Ready.

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Chapter 11. Troubleshooting

2.Disconnect the ISU 128 from the ISDN line. From a functioning voice phone, call the local directory number(s) provided with your line. Calling a good ISDN line with nothing connected usually results in a ring or fast busy tone. If someone answers or a not-in-service intercept is received, there is probably something wrong with the translation of the ISDN line. The phone service provider should be able to help.

3.If the ISU 128 continues to read Link Down, there is a physical problem with the ISDN phone line (more than likely, a problem with the Layer 1 setup). The problem may be one or more of the following:

The ISU 128 software setup

The ISU 128 hardware

The wiring on your premises

The telephone service provider's wiring

The telephone service provider's hardware

The telephone service provider's software setup

To isolate the problem, perform the following procedure:

A.Make sure the ISU 128 is configured for dial line service. Check that

CONFIG, Netw. options, Dial Line, is selected on the menu.

B.Try another piece of functioning ISDN equipment with a U-interface on the ISDN line.

C.Talk to your service provider and ensure you have an ISDN Basic Rate U-Interface with 2B1Q line coding (wrong options are an S or T interface or AMI line coding).

D.Ensure that your ISDN phone line is connected to the actual telephone line (U-interface) provided by your telephone company. Make sure your ISDN line is not connected though another piece of equipment such as an NT1 in a wiring closet somewhere.

E.Make sure nothing else is bridged across the ISDN line pair.

F.With a minimum of extra wiring, try connecting to the ISDN line pair at the point where service provider's wiring ends.

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G.With the ISU 128 connected to the ISDN line and powered up, talk to your service provider's repair group and inform them that your ISDN basic rate line has a physical layer 1 problem. Ask them to check the ISDN line. Tell them that you have an NT1-like device at the end of the ISDN line.

4.If the ISU 128 continues to read Getting TEI #1, the ISU 128 is physically connected to your local telephone service provider but is unable to establish logical layer 2. The problem may be one or more of the following:

The ISU 128 software setup

The telephone service provider's software setup

Hardware configuration if the ISDN line is extended from the switch

To isolate the problem, use the following procedure:

A.Ensure the ISU 128 is set up for the correct switch protocol by selecting

CONFIG, Netw. options, Dial Line, Switch protocl.

B.Ensure the line quality is satisfactory by checking for nearand far-end block errors (NEBEs and FEBEs). To do this, select Test, NEBE/FEBE. If the counts are non-zero and incrementing, there may be a physical link problem as described under Link Down (Step 3).

C.Try another piece of functioning ISDN equipment with a U-interface on the line.

D.With the ISU 128 connected to the line and powered up, talk to your service provider's repair group and tell them you have an ISDN basic rate line that appears physically okay but has no terminal endpoint identifier (TEI). Ask them to check the ISDN line translation and ensure that the ISDN line supports dynamic TEI allocation. Tell them that you have an NT1 and terminal adapter device connected to the line.

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5.If the ISU 128 continues to read Register SPID #1, the ISU 128 is physically connected to the local telephone service provider and has established logical layer 2. The ISU 128 is unable to establish layer 3. The problem may be one or more of the following:

The ISU 128 software setup

The telephone service provider's software setup

To isolate the problem, use the following procedure:

A.Ensure the ISU 128 is set up for the correct switch protocol by selecting

CONFIG, Netw. options, Dial line, Switch protocl.

B.Ensure the ISDN line is multipoint.

C.Make sure that the ISU 128 is set up with the correct SPID and LDN by selecting CONFIG, Netw. options, Dial Line, Terminal ID, SPID/LDN.

D.Try another piece of functioning ISDN equipment with a U-interface on the line.

E.With the ISU 128 connected to the ISDN line and powered up, talk to your service provider's repair group and tell them you have an ISDN basic rate line that appears physically okay but has no terminal endpoint identifier (TEI). Ask them to check the line translation and ensure that the line supports dynamic TEI allocation. Tell them that you have an NT1 and terminal adapter device connected to the line.

6.If the ISU 128 continues to read Getting TEI #2, the ISU 128 has completely initialized the first phone number but is unable to establish logical layer 2 for the second phone number. The problem may be one or more of the following:

The ISU 128 software setup

The telephone service provider's software setup

To isolate the problem, use the following procedure:

A. Ensure the ISDN line is multipoint with two phone numbers.

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B.Ensure that the ISU 128 is set up with the correct SPID and LDN by selecting CONFIG, Netw. options, Dial Line, Terminal ID, SPID/LDN.

C.Try swapping SPID1 with SPID2 and LDN1 with LDN2. Determine if the problem is the second phone number or the quantity of phone numbers.

D.Try another piece of functioning ISDN equipment with a U-interface on the ISDN line.

E.With the ISU 128 connected to the ISDN line and powered up, talk to your service provider's repair group and tell them you have an ISDN basic rate line that appears physically okay but has no TEI. Ask them to check the line translation and ensure that the line supports dynamic TEI allocation.

Tell them that you have an NT1 and terminal adapter device connected to the line.

7.If the ISU 128 continues to read Register SPID #2, the ISU 128 has completely initialized the first phone number but is unable to establish logical layer 3 for the second phone number. The problem is in one or more of the following places:

The ISU 128 software setup

The telephone service provider's software setup

To isolate the problem, use the following procedure:

A.Ensure the ISDN line is multipoint with two phone numbers.

B.Ensure that the ISU 128 is set up with the correct SPID and LDN by selecting CONFIG, Netw. options, Dial Line, Terminal ID, SPID/LDN.

C.Try swapping SPID1 with SPID2 and LDN1 with LDN2.

Determine if the problem is the second phone number or the quantity of phone numbers.

D.Try another piece of functioning ISDN equipment with a U-interface on the line.

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E.With the ISU 128 connected to the line and powered up, talk to your service provider's repair group and tell them you have an ISDN basic rate line that appears physically okay but has no terminal endpoint identifier (TEI). Ask them to check the line translation and ensure that the line supports dynamic TEI allocation. Tell them that you have an NT1 and terminal adapter device connected to the line.

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Chapter 12

Specifications

SPECIFICATIONS AND FEATURES

This section describes the standard specifications and features incorporated in the ISU 128.

Network Interface

RJ-45 for ISDN Basic Rate U-Interface, and Leased 2B1Q service

DTE Interface

RS-530

V.35

EIA-232

Dialing Selections

In-band DTE dialing: V.25 or AT commands

Manual or automatic stored number dialing, DTR assertion

Dial interface: RS-366

Front panel manual dialing

Data Rates (Network)

64 kbps (one B channel), 128 kbps (two B channels)

Data Rates (DTE)

300 bps to 115.2 kbps asynchronous

2400 bps to 128 kbps synchronous

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Rate Adaption

T-Link

CCITT V.120

CCITT V.110

SAP

DSU 57.6 Async

BONDING mode 1

V.34 (optional)

PPP

MP

Interoperability

BONDING Inverse Multiplexers

Switched 56 DSUs

ISDN TAs

V.34 modems (optional)

Switch Compatibility

AT&T 5ESS

NTI DMS-100

National ISDN-1

NEC

B Channel Aggregation

BONDING Mode 1

MP

Display

Two-line by 16 character LCD

LED indicators

RS

Request to Send.

 

Indicates the DTE is ready to transmit.

CS

Clear to Send.

 

Indicates the ISU 128 is ready to transmit.

TD

Transmit Data.

 

On when the DTE is transmitting to the ISU 128.

RD

Receive Data.

 

On when the ISU 128 is receiving data from the far end.

CD

Carrier Detect.

 

On when the ISU 128 is connected to a remote unit.

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TR

Data Terminal Ready from DTE.

 

On when DTR is active at DTE interface.

SR

Data Set Ready.

Environmental

Operating Temperature: 0 to 50 °C

Storage Temperature: 20 to 70 °C

Relative Humidity: Up to 95%, non-condensing

Physical

Dimensions: 2.25"H x 8.75"W x 11.00"D

Weight: 3 lbs.

Power

115 VAC, 60 Hz, 8 W maximum dissipation (part numbers 1202029L2 and 1202029L3)

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