Verilink ConnecT 56K DSU User Manual

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Access System 2000

ConnecT 56K DSU User Manual

Part Number 896-502110-001-A November 1993

Verilink Corporation

145 Baytech Drive

San Jose, California 95134

Important Notice

Before performing any operat ions, PLEASE READ AND UNDERSTAND ALL INSTRUCTIONS IN THIS MANUAL.

ITC Helvetica and ITC Times / International Typeface Corporatio n

Panasonic is a registered trademark of Panasonic Corporation

WHEN YOU ARE FINISHED, PUT THIS MANUAL IN A PROMINENT LOCATION; DO NOT THROW THIS MANUAL AWAY, unless it is being replaced by a corrected or updated manual.

VERILINK CORPORATION DISTRIBUTES THIS REFERENCE “AS IS” WITHOUT WARRANTY OF ANY KIND, EITHER LIMITED OR IMPLIED. Verilink Corporation reserves the right to revise this publication from time to time without notice. Some states or jurisdictions do not al low disclaimer of ex press or implied warranties in certain transactions; therefore, this statement may not apply to you.

This reference was written, illustrated, and produced using FrameMaker publishing software and AutoCad 12



workstation



computer design software, Sun IPX and IPC Workstations, Sun Sparc Laser Printers, and the ITC Helvetica and ITC Times families of typefaces.

Your right to copy Access System 2000 and this manual is limited by copyright law. Making copies of this reference, or any part thereof, without prior written authorization from Verilink Corporation is prohibited by law and constitutes a punishable violation of the law

The following are trademarks or registered trademarks of their respective companies or organizations:

AutoCad 12 / Autodesk Corporation

Access System 2000, Access Manager 2000, Advanced Programmable Architecture, and Craft Interface / Verilink Corporation

Sun Microsystems, Open Windows, Sparc Printer, IPX, IPC, and Sun Workstation / Sun Microsystems, Inc.

FrameMaker and Frame Technology / Frame Technology Corporation

FCC Warning Statement

The Federal Communications Commission (FCC) Rules require that you be notified of the following:

This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with this reference, can cause interference to radio communications.

This equipment has been tested and found to comply within the limits for Class A devices pursuant to Subpart J of Part 15 of the FCC rules, which are designed to provide reasonable protection against such interference when operated in a commercial environment.

Operation of this equipment in a residential area is likely to cause interference, in which case the user(s) will be required to take whatever measures (that can be) required to fix the interference at their own expense.

Per FCC Part 68 requirements, the customer is required to notify the Telephone Company prior to disconnecting any CSU from the network interface.

FrameMaker and Frame Technology / Frame Technology Corporation

CHAPTER 1 - Introduction ................................................................................................1-1

Unit Overview ................................................................................................................... 1-1

ConnecT 56K DSU rear panel ............................................................................... 1-2

DDS Overvie ................................................................................................................... 1-4

Switched 56 overview ........................................................................................................ 1-5

CHAPTER 2 - Installation ..................................................................................................2-1

Unpack, inspect, power up ................................................................................................. 2-1

What Verilink shipments include ........................................................................... 2-1

What the customer provides ................................................................................... 2-1

Power up ................................................................................................................. 2-1

Connecting the cables ........................................................................................................ 2-3

Network interface connection ................................................................................ 2-3

DTE data connection ...................... .. ...................................................................... 2-3

Secondary channel connection ............................................................................... 2-6

Configuration ..................................................................................................................... 2-7

Configuration methods ...................................................................................................... 2-8

Front panel ............................................................................................................. 2-8

“AT” commands ..................................................................................................... 2 -8

V.25 bis commands ................................................................................................ 2-9

SDLC option character format ................................................................. 2-9

BI-Sync option character format ............................................................ 2-10

Asynchronous option character format ................ .................................. 2-10

Command descriptions .......................................................................... 2-11

The syntax and possible responses ........................................................ 2-12

Switched 56 operation .......................................................................................... 2-13

Remote commands ............................................................................................... 2-14

CHAPTER 3 - Operation ................ ........ ........ ....................................................................3-1

Understanding the keypad ................................................................................................. 3-1

Manual operation and button functions .................................................................. 3-2

Enter button ............................................................................................. 3-2

Cancel ...................................................................................................... 3-2

Up and down scroll .................................................................................. 3 -2

Numeric keypad ....................................................................................... 3-3

ConnecT 56K DSU User Manual i

* (Shift) ..................................................................................................... 3-3

(Quick) # .................................................................................................. 3-3

Examples ................................................................................................................. 3-3

Menu structure .................................................................................................................... 3-5

The four opening menu functions ...........................................................................3-5

1=Status .................................................................................................... 3-5

2=Test ....................................................................................................... 3-5

3=Config ................................................................................................... 3- 5

4=Dial ....................................................................................................... 3-6

General operations and menus ........................................................................................... 3-7

General operation method ....................................................................................... 3-7

Menu map ...................................... ......................................................................... 3-7

1 = STATUS ....................................................................................................................... 3-9

Submenu items ........................................................................................................3-9

2 = TEST .......................................................................................................................... 3-11

1=Local Unit ......................................................................................................... 3-12

1 = DTE & LOOP (LL) ..........................................................................3-13

2 = LOOP ONLY (RT) .......................................................................... 3-15

3 = DTE ONLY ......................................................................................3-16

4 = DTE WITH TP .................................................................................3-17

5 = Test Pattern ....................................................................................... 3-19

6 = Self test ............................................................................................. 3-20

2=Remote unit ....................................................................................................... 3-20

1 = Exit Test and 2 = Display Status ......................................................3-22

3 = CONFIG .....................................................................................................................3-24

Operation .............................................................................................................. 3-24

1=Network Options ............................................................................................... 3-25

Submenu 1 loop rate ...............................................................................3-27

Submenu 2 network ................................................................................3-28

Submenu 3 remote configuration ...........................................................3-28

Submenu 4 network type ..................... ...................................................3-28

Submenu 5 clock source .........................................................................3-29

2 = DTE options .................................................................................................... 3-29

Menu map ............................................................................................... 3-30

Operation ................................................................................................ 3-30

Submenu 1 DTE rate ..............................................................................3-31

Submenu 2 connector type .....................................................................3-32

Submenu 3 data format ...........................................................................3-33

Submenu 4 DTE CMD option ................................................................3-34

Submenu 5 transmit clock ......................................................................3-34

Submenu 6 CS options ...........................................................................3-35

Submenu 7 anti -stream ..........................................................................3-37

ii ConnecT 56K DSU User Manual

Submenu 8 CD options .......................................................................... 3-38

Submenu 9 TR Options .......................................................................... 3-39

Submenu A SR options .......................................................................... 3-40

Submenu B secondary rate .................................................................... 3-40

3=Test options ...................................................................................................... 3-41

Menu map .............................................................................................. 3-42

Operation ............................................................................................... 3-42

Submenu 1 test timeout .......................................................................... 3-42

Submenu 2 RDL select .......................................................................... 3-42

Submenu 3 EIA LLB select ................................................................... 3-43

Submenu 4 EIA RLB select ................................................................... 3-43

4 = Dial options .................................................................................................... 3-43

Menu map .............................................................................................. 3-44

Operation ............................................................................................... 3-44

Submenu 1 phone number ..................................................................... 3-44

Submenu 2 auto answer ......................................................................... 3-44

5 = Manual command ........................................................................................... 3-45

Operation ............................................................................................... 3-45

APPENDIX A - Reference ................................................................................................. A-1

Warranty and customer service ......................................................................................... A-1

Telephone company information ...................................................................................... A-2

AT commands ......................... .... .. .... .. .... .......................................................................... A-3

Configuration profiles ....................................................................................................... A-6

Figures .............................................................................................................................. A-8

ConnecT 56K DSU User Manual

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iv ConnecT 56K DSU User Manual

List of Figures

Figure 1-1 ConnecT 56K DSU Front View ................................................................................... 1-2

Figure 1-2 ConnecT 56K DSU Rear View .................................................................................... 1 -2

Figure 3-1 ConnecT 56K DSU Front View ................................................................................... 3-1

Figure 3-2 Status Display .............................................................................................................. 3-9

Figure 3-3 Complete Test Menu ................................................................................................. 3-11

Figure 3-4 Local Unit Menu ....................................................................................................... 3-12

Figure 3-5 Status Display ........................................................................................................... 3-14

Figure 3-6 Status Display ............................................................................................................ 3-16

Figure 3-7 Status Display ........................................................................................................... 3-17

Figure 3-8 DTE WITH TP MENU .............................................................................................. 3-18

Figure 3-9 Complete Configuration Menu .................................................................................. 3-25

Figure A-1 DTE and Loop Test Diagram ...................................................................................... A-8

Figure A-2 Loop Only Test Diagram ............................................................................................ A-9

Figure A-3 DTE Only Test Diagram ............................................................................................. A-9

Figure A-4 DTE With Test Pattern Diagram ............................................................................... A-10

Figure A-5 Test Pattern Only Diagram ....................................................................................... A-10

Figure A-6 DSU to Modem Interconnect Diagram .................................................................... A-11

Figure A-7 EIA 232 Connector for 56 KB/s and 64 KB/s Application ...................................... A-11

ConnecT 56K DSU User Manual v

List of Figures

ConnecT 56K DSU User Manual

List of Tables

Table 1-1 LED Identification ....................................................................................................... 1-2

Table 1-2 Identification of Numbers ............................................................................................ 1-3

Table 2-1 Pin Assignments for TELCO Connector .................................................................... 2-3

Table 2-2 Pin Assignments for Primary RS-232 Connector ........................................................ 2-4

Table 2-3 Pin Assignments for Primary V.35 Connector ............................................................ 2-5

Table 2-4 Pin Assignments for Auxiliary RS-232 Connector ...................................................... 2-6

Table 3-1 Identification of Numbers ............................................................................................ 3-1

Table 3-2 LED Identification ....................................................................................................... 3-2

Table 3-3 Test Commands ........................................................................................................3-13

Table 3-4 Test Displays ............................................................................................................. 3-14

Table 3-5 Available Interface Leads ......................................................................................... 3-14

Table 3-6 Submenu Test Commands ........................................................................................ 3-15

Table 3-7 DTE With Test Pattern Commands .......................................................................... 3-18

Table 3-8 Test Displays ............................................................................................................. 3-22

Table 3-9 Available interface leads ........................................................................................... 3-22

Table 3-10 Configuration submenus ............................................................................................ 3-24

Table 3-11 Submenus of 3=Config .............................................................................................. 3-24

Table 3-12 Loop Rate Commands ............................................................................................... 3-27

Table 3-13 Network Address Commands .................................................................................... 3-28

Table 3-14 Remote Configuration Commands ............................................................................ 3-28

Table 3-15 Network Type Commands ........................................................................................ 3-29

Table 3-16 Clock Source Commands .......................................................................................... 3-29

Table 3-17 DTE Rate Commands ................................................................................................ 3-31

Table 3-18 Loop Rate of 56K ....................................................................................................... 3-31

Table 3-19 Connector Type Commands ..................................................................................... 3-32

Table 3-20 Data Format Commands ........................................................................................... 3-33

Table 3-21 DTE CMD Commands ............................................................................................. 3-34

Table 3-22 Transmit Clock Commands ...................................................................................... 3-35

Table 3-23 CS Options Commands ............................................................................................. 3-36

Table 3-24 Anti-Stream Commands ............................................................................................ 3-38

Table 3-25 CD Options Commands ............................................................................................ 3-39

Table 3-26 TR Options Commands ............................................................................................. 3-39

Table 3-27 SR Options Commands .............................................................................................. 3-40

Table 3-28 Secondary Rate Commands ....................................................................................... 3-41

ConnecT 56K DSU User Manual vii

List of Tables

Table 3-29 RDL Select Commands ............................................................................................. 3-43

Table 3-30 EIA LLB Select Commands ......................................................................................3-43

Table 3-31 EIA RLB Select Commands ...................................................................................... 3-43

Table 3-32 Auto Answer Commands ........................................................................................... 3-44

Table 3-33 Manual Command Values for Profiles .......................................................................3-45

Table A-1 Telephone company information ................................................................................. A-2

Table A-2 AT Commands ............................................................................................................. A-3

Table A-3 Configuration Profiles ................................................................................................ A-6

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ConnecT 56K DSU User Manual

Chapter

1 Introduction

Unit Overview

This chapter provides an overview of the Verilink ConnecT 56K DSU, Digital Data Service (DDS), and Switched 56 service.

The stand-alone Verilink ConnecT 56K DSU provides a reliable, high speed data connection from a customer’s Data Terminal Equipment (DTE) through Digital Data Service (DDS) lines, DDS secondary channel services (DDSII), or 4-wire Switched 56 Network (SW56) lines. The ConnecT 56K DSU supports both synchronous and asynchronous data communication over the DDS or SW56 networks.

There are three easy methods for configuration:

1. A front panel dial pad and a LCD display provides quick and easy access to configuration menus.

2. “AT” commands or by V.25 bis commands inband.

3. Remotely located ConnecT 56K DSU units can be configured by using the front panel, AT commands, o r V.25 bis.

The ConnecT 56K DSU provides both V.35 and RS-232 electrical and physical DTE interfaces to accommodate a variety of applications. A second RS-232 interface is provided if the unit is configured for use on DDS with secondary channel services. The ConnecT 56K DSU is compatible with AT&T Accunet and U.S. Sprint SW56 as well as standard DDS or DDS II services. To insure a reliable connection on those services, the unit features an extended receiver capability which permits operation over long loops (3.4 miles or 5.5 km at 26 awg).

ConnecT 56K DSU User Manual 1-1

Introduction

Figure 1-1 ConnecT 56K DSU Front View

ConnecT 56K DSU

ENTER

ConnecT 56K DSU rear panel

RD CD ALM TST

CANCEL

Table 1-1 LED Identification

RS Request to Send CS Clear to Send TD Transmit Data RD Receive Data CD Carrier Detect ALM Alarm Indication TST Test Mode

The rear panel contains three data DTE connectors which provide primary channel V.35 or RS-232, and a secondary channel RS-232 port (Auxiliary EIA 232). An 8-pin Telco jack, a captive power cord, and a power switch are also located on the rear panel. Pin assignments for the DTE and network connections are listed in Chapter 2.

1-2

Figure 1-2 ConnecT 56K DSU Rear View

TELCO

ConnecT 56K DSU User Manual

AUXILIARY EIA-232

PRIMARY EIA-232

PRIMARY V.35

FLB

UTK

EJA

MSH

JNJDZ

HMH

EKKEA

115 VAC 60HZ 15A

ON OFF

Unit Overview

Table 1-2 Identification of Numbers

Item Function

1. Auxiliary EIA-232 Secondary channel services

2. Power Switch Used to turn power on or off.

3. Telco Connection to the Telephone Company

4. Primary EIA-232 DTE interface

5. Primary V.35 High speed digital data interface

6. 115 VAC Connection Power cord connection

ConnecT 56K DSU User Manual

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Introduction

DDS Overview

Digital Data Service (DDS) is a nationwide service that allows interconnection and transport of data at speeds up to 64 kB/s. The local exchange carriers provide the local loop service to DDS customers and may provide data for routing Inter-LATA to an interexchange carrier. In DDS mode the ConnecT 56K DSU supports all DDS service rates yielding DTE rates of 2.4, 4.8, 9.6, 19.2, 38.4 (sync or async) 56kbps and 64kbps. An additional rate of 57.6 kbps i s available in async mode. At the service rate of 56k the unit can be configured to run slower DTE rates (async or sync) over the 56kbps service. Secondary channel operation is supported at all service rates up to 56K, providing terminal rates of 75, 150, 300, 600, 1200, and 2400 bps. The secondary rates available depend on the service rate configured.

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ConnecT 56K DSU User Manual

Switched 56 overview

This dial-up 4-wire Digital Data Service allows customers to pay for data connection only when the unit is active. The regional Operating Companies provide the 4-wire local loop service to SW56 customers.

Switched 56 service is supplied by AT&T, U.S. Sprint and other interexchange carriers. In SW56 mode the ConnecT 56K DSU supports DTE rates of 2.4, 4.8, 9.6, 19.2, 38.4 (async or sync) and 56kbps (sync). Additional DTE rate of 57.6kbps is available in async modes.

Switched 56 overview

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Introduction

1-6

ConnecT 56K DSU User Manual

Chapter

2 Installation

This chapter explains how to install the ConnecT 56K DSU.

Unpack, inspect, power up

Carefully inspect the ConnecT 56K DSU for any shipping damages. If damage is suspected, file a claim immediately with the carrier and then contact Verilink Customer Service. If possible, keep the original shipping container for use in shipp ing the ConnecT 56K DSU back for re pair or fo r verification of damage during shipment.

What Ve rilink shipments include

What the customer provides

Power up

Verilink shipments include the following:

■ The ConnecT 56K DSU unit.

■ Two line interface cables:

• an 8-position/modular to 8-position modular

• an 8-position/modular to 8-position spade lug

■ The user guide.

The customer must provide the following:

■ DTE cable(s):

■ An RS-232 Interface Cable with standard 25-pin male D-type

connectors (Cannon or Cinch DB-1 9604-432) or V.35 cable.

Each DSU unit is provided with a captive eight-foot power cord, terminated by a three-prong plug which connects to a grounded power receptacle.

A telco connector is provided for interface to the network and two others provide connection to the data terminal equipment (DTE).

ConnecT 56K DS User Manual 2-1

Installation

CAUTION

Power to the DSU must be from a 115 VAC, 60Hz that is grounded.

2-2

ConnecT 56K DSU User Manual

Connecting the cable

This section describes the following connections:

■ Network interface connection

■ DTE data connection

■ Secondary channel connection

Connecting the cables

Network interface connection

DTE data connection

The ConnecT 56K DSU has an eight-position modular jack labelled “TELCO.” The connector is used for connecting to the network when the unit is configured for either dedicated or switched operation. The pin-out for the “TELCO” connector is listed in Table 2-1, “Pin Assignments for TELCO Connector”.

Table 2-1 Pin Assignments for TELCO Connector

Pin Name Description

1 R T ransmit Data (from DSU to

Network-Ring)

2 T Transmit Data (from DSU to

Network-Tip) 3-6 Not Used 7 T1 Receive Data (from Network

to DSU-Tip 1) 8 R1 Receive Data (from Network

to DSU-Ring 1)

The primary DTE should be connected to either the RS-232 DTE connector or the CCITT V.35 DTE connector. The maximum cable lengths recommended are 50 feet for the RS-232, and 100 feet for the CCITT V.35. The pin assignments for the connectors are listed in Table 2-2, “Pin Assignments for Primary RS-232 Connector” and Table 2-3, “Pin Assignments for Primary V.35 Connector”.

The V.35 connector is recommended for use with data rates above

19.2kbps. The RS-232 connector will work up to 56kbps with a lo capacitance cable or with the external transmit clock option selected. The

ConnecT 56K DS User Manual

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Installation

primary DTE rate is configured from the front panel. The PRIMARY Data Terminal Equipment can operate in asynchronous or synchronous modes.

CAUTION

To prevent possible Radio Frequency interference emissions, a shielded V.35 Cable is required.

Table 2-2 Pin Assignments for Primary RS-232 Connector

Pin EIA Description

1 AA Protectiv e Gr ound (PG) 2 BA Transmit Data (SD) 3 BB Receive Data (RD) 4 CA Request To Send (RS) 5 CB Clear To Send (CS)

2-4

6 CC Data Set Ready (SR) 7 AB Signal Grou nd (SG) 8 CF Received Line Signal Detec-

tor (CD) 9 - +12 T est P oint 10 - -12 Test Point 15 DB Transmit Clock (TC) 17 DD Receive Clock (RC) 18 - Local Loopback (LL) 20 CD Data Terminal Ready (TR) 21 - Remote Loopback (RL) 22 CE Ring Indicator (RI) 24 DA External TX Clock (ETC) 25 - Test Indicator (TI)

ConnecT 56K DSU User Manual

Connecting the cables

Table 2-3 Pin Assignments for Primary V.35 Connector

Pin CCITT Description

A 101 Protective Ground (PG) B 102 Signal Ground (SG) C 105 Request To Send (RTS) D 106 Clear To Send (CTS) E 107 Data Set Ready F 109 Received Line Signal Detec-

tor (CD) H - Data Terminal Ready (DTR) J - Ring Indicator (RI) L - Local Loopback (LL) N - Remote Loopback (RL) R 104 Received Data (RD-A) T 104 Received Data (RD-B) V 115 Receiver Signal Element Tim-

ing (SCR-A) X 115 Receiver Signal Element Tim-

ing (SCR-B) P 103 Transmitted Data (SD-A) S 103 Transmitted Data (SD-B) Y 114 Transmitter Signal Element

Timing (SCT-A AA 114 Transmitter Signal Element

Timing (SCT-B U 113 Extern al TX Signal Element

(SCX-A) W 113 External TX Signal Element

(SCX-B) NN - Test Indicator (TI)

ConnecT 56K DS User Manual

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Installation

Secondary channel connection

If used, the secondary data terminal equipment should be connected to the Auxiliary EIA 232 connector. The pin-out for the connector is listed in Table 2-4, “Pin Assignments for Auxiliary RS-232 Connector”.

Table 2-4 Pin Assignments for Auxiliary RS-232 Connector

Pin EIA Description

1 AA Protective Ground (PG) 2 BA Transmit Data (SD) 3 BB Receive Data (R D) 4 CA Request-to-Send (RS) 5 CB Clear-to-Send (CS) 6 CC Data Set Ready (SR) 7 AB Signal Ground (SG) 8 CF Received Line Signal Detector (CD).

Always on.

2-6

ConnecT 56K DSU User Manual

Configuration

The ConnecT 56K DSU contains four different user profiles (sets of configurations options) listed in Appendix II, that are stored in read only memory. The unit is shipped from the factory with profile 1 (default configuration) loaded into the non-volatile configuration memory. If profile 1 matches the desired system requirements, then no additional configuration is required to put the unit into service. If profile 1 does not match the desired system requirements, there are two options available.

1. Modify the default configuration.

2. Select one of the other profiles that more nearly matches the desired configuration, modify to required specifications.

When a new profile is loaded, or the existing profile is modified, it is stored in the non-volatile configuration memory. The ConnecT 56K DSU is then configured with that profile every time power is turned on, or the unit is reset.

ConnecT 56K DS User Manual

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Installation

Configuration methods

The ConnecT 56K DSU provides four different methods for local configuration and three different methods for remote configuration:

1. Front Panel

2. AT Commands

3. V.25 bis

4. Remote Commands

Front panel

“AT” commands

The Front Panel provides access to all operation parameters of the ConnecT 56K DSU through a multi-level menu structure which begins with the four-part Main Menu. (See Chapter 3).

1=STATUS Displays status of network and DTE interface 2=TEST Controls local and remote testing 3=CONFIG Displays/changes current configuration parame-

ters

4=DIAL Provides manual dialing functions (a vailable only

when unit is configure d for SW56 operation).

In addition to the front panel, the ConnecT 56K DSU can be configured and controlled with in-band AT commands from an asynchronous DTE port just as modems are.

To exit the data mode and enter the command mode, the asynchronous DTE device must transmit a proper escape sequence to the ConnecT 56K DSU. 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 t o occur, the DTE must transmit the escape code character three times in succession with delay between each character being less than the guard time.

2-8

ConnecT 56K DSU User Manual

Configuration methods

Once the command mode is entered, AT commands can be transmitted to the ConnecT 56K DSU to configure most of the options, dial remote DSUs, or initiate tests to check both the ConnecT 56K DSU and the network connections. All command lines must begin with the AT character set in either capital or lower case letters. A command line can be terminated at any time by transmitting the CTRL-X (ASCII 018) after the AT attention code. The ConnecT 56K DSU will ignore this command line and issue 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 is 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 ConnecT 56K DSU 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. Valid AT commands for the ConnecT 56K DSU are listed in Appendix I.

V.25 bis commands

2. BI-SYNC

3. ASYNCHRONOUS.

2. Parity bit - IGNORED

When configured for the V.25 bis option, the ConnecT 56K DSU accepts in-band dialing and configuration commands from both synchronous and asynchronous DTE ports.

The V.25 bis option supports the following protocols:

1. SDLC

SDLC option character format

1. Data bits - 8

COMMAND STRUCTURE:

ConnecT 56K DS User Manual

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Installation

[F][A][C][V.25 bis COMMAND][FCS][F]

The address field [A] is FFH. The control field [C] is set to 13H except for cases of multi-frame responses. For this case, t he contr ol field is set to 03H in all but the last frame. The 03H in the control field indicates that other frames are to follow while the 13H in the control field indicates the final frame.

BI-Sync option character format

1. Data bits - 7

2. Parity bit - OD COMMAND STRUCTURE:

[SYN][SYN][STX][V.25 bis COMMAND][ETX]

Asynchronous option character format

1. Start bit - 1

2. Data bits - 7

3. Parity bit - EVEN

4. Stop bit - 1 COMMAND STRUCTURE:

[V.25 bis COMMAND][CR][LF]

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ConnecT 56K DSU User Manual

Configuration methods

Command descriptions

The Verilink V.25 bis command set is a subset of the CCITT V.25 bis command set. In addition to the CCITT commands supported, Verilink has added configuration commands for both the local and remote DSU’s. The Verilink V.25 bis command set is:

CIC Connect Incoming Call CNL CoNfiguration Local CNR CoNfiguration Remote CRN Call Request with Number CRS Call Request using Stored number DIC Disregard Incoming Call PRN PRogram Number RLN Request List of Numbers

Possible responses to V.25 bis commands are:

VALA Valid V.25 command processed INV An Invalid command detected CFIET Call failed on switched network - busy detected CFIDE Call failed on switched network - no wink detected CFINS Call failed - no dial string in specified register INVCU Unknown command detected INVPS Invalid parameter syntax INVPV Invalid parameter value INVBL Invalid local password INVBM Invalid remote password INC Incoming call CNX Call connected

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Installation

If verbose responses are disabled (ATV0), the 3 character responses listed below are the only ones returned:

VAL Valid V.25 command pro-

cessed INV Invalid command received CFI Call failed INC Incoming call CNX Call connected

The syntax and possible responses

Following is a list of V.25 bis commands and their possible responses. CIC Connect Incoming Call: This command causes the DSU to go online. There are no parameters

associated with this command. Possible indications include: VALA, CNX, CFIxx

2-12

CNL Local Configuration: This command is used to pass AT commands to the local modem via the

V.25 bis command processor. This allows the ConnecT 56K DSU to be configured with AT commands via a synchronous interface. The format of this command is:

CNL[LOCAL PASSWORD];AT[ONE OR MORE AT COMMANDS]

The local password may or may not be required depending on the present configuration of the unit. Responses to CNL commands are returned in the data format currently configured. Possible responses include: VALA and INVAn.

CNR Remote Configuration: This command is used to pass AT commands over the network to the

remote DSU via the V.25 bis command processor. This allows a remote ConnecT 56K DSU to be configured from a synchronous interface. The format of CNR this command is:

CNR[REMOTE PASSWORD];AT[ONE OR MORE AT COMMANDS]

ConnecT 56K DSU User Manual

Configuration methods

The remote password may or may not be required depending on the present configuration of the remote unit. Responses to the CNR commands are returned in the data format currently configured. Possible responses include: VAL and INVAn.

Switched 56 operation

Following is a list of switched 5 6 commands and their poss ible respo nses. CRN Call Request with Number: When the ConnecT 56K DSU is configured for switched 56 operation,

the CRN command causes the DSU to dial the supplied number. The format of the command is:

CRN [NUMBER TO BE DIALED]

If no number is included in the command, the number stored in dial register number 1 is dialed. If no number is provided and no number is stored in dial register number 1, the ConnecT 56K DSU responds with the call failure indication CFINS (Call Failure Indication Not Stored).

CRS Call Request using Stored number: The CRS command causes the ConnecT 56K DSU to dial the number

stored in the specified register. The format of this command is:

CRS [OPTIONAL SPACE][REGISTER NUMBER 1-10]

If this command is issued without the register number parameter, the INVPS (INValid Parameter Syntax) response is issued. If this command is issued and the register parameter is not in the valid range for dialing registers, the INVPV (INValid Parameter Value) response is returned. Other responses include: VAL, CNX, CFIxx

DIC Disregard Incoming Call: This command causes the V.25 bis processor to return to command mode

even if there is an incoming call pending. This allows the user to issue local commands and ignore the incoming calls. There are no parameters associated with this command. Possible responses include: VAL.

PRN Program Number: This command stores the supplied number into the specified register. The

format of this command is:

PRN [REGISTER NUMBER];[NUMBER TO BE STORED]

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Installation

If this command is entered with no parameters, the INVPS response is returned. If no register number is included in the command or if it is invalid, the INVPV response is returned. If the number to be stored contains invalid characters, the INVPV response is also returned. The characters 1, 2, 3, 4, 5, 6, 7, 8, 9, 0,: P, T, and & are valid dial characters. If no digits are issued with this command, the specified register is cleared. Possible responses include: VAL.

RLN Request List of Numbers: This command causes the ConnecT 56K DSU to return the number stored

in the specified register. The format of this command is: RLN [REGISTER NUMBER] If the register number is invalid, the INVPV response is returned. When a

correct register number is entered, the response is: LSN [REGISTER NUMBER];[NUMBER STORED]VAL If no register number is present in the command, the ConnecT 56K DSU

responds with a list of all the registers and the stored numbers. This list is followed by the VAL response. Possible indications include: VAL.

Remote commands

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ConnecT 56K DSU User Manual

Remote Configuration is available by attaching a remote device via the Primary EIA-232 connection on the rear panel and setting the DSU to accept Remote Configurations.

The 3=CONFIG menu is used to enable or disable the ConnecT 56K DSU remote configuration capability. See Chapter 3, Menu 3=CONFIG.

Chapter

3 Operation

This chapter describes the keypad, menu functions, and ConnecT 56K DSU operation.

Understanding the keypad

Following is an illustration of the ConnecT 56K DSU keypad.

Figure 3-1 ConnecT 56K DSU Front View

RD CD ALM

ConnecT 56K DSU

TST

ENTER

CANCEL

Table 3-1 Identification of Numbers

Item Description Function

1 LCD Window Displays menu items and messages in

2 lines by 16 characters.

2 ENTER Selects active menu items. 3 Numeric Keypad: Shift:

Numbers/Alpha characters ac tivat e menu items. The Alpha ch ar act er s are entered by pressing the shift key before each desired cha rac ter. Quick return to the 3 main menu choices.

(Quick) / #

4 C A N C E L Exits submenus. 5 Up and Down Scroll

Changes display of menu items.

Arrows

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Operation

Table 3-2 LED Identification

RS Request to Send CS Clear to Send TD Transmit Data RD Receive Data CD Carrier Detect ALM A larm Indication TST Test Mode

Manual operation and button functions

This section explains the use of buttons and manual operation.

Enter button

The Enter button is used to select menu items. For example, to select menu Items press the Up or Down scroll buttons to display menu items. When the desired menu item is displayed, press the number of the item to activate (flashing). When the desired menu item is flashing, press the Enter button. As a result, a submenu is invoked or a configuration parameter is set. The display of “command accepted” indicates a valid operation.

Cancel

Cancel the current activity, and return to the previous menu; repeat until the desired menu level is displayed. For example, when t he Submenu item is displayed. Press the cancel button resulting in the display returning to the previous menu. Repeat until the desired menu level is reached.

Up and d wn scroll

View all of the submenu selections available in the active menu. Submenu items display two at a time and in a circular or wrapping fashion. When the submenu items are scrolled, they will continuously appear from beginning to end in a forward (down button) or reverse (up button) pattern.

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ConnecT 56K DSU User Manual

Understanding the keypad

Note:

The active menu item or configuration parameter flashes.

Examples: 1. To view submenu items in a forward pattern: When the menu is selected and the submenu items are displayed press the

down scroll button. When the end of the list is reached, pressing the down scroll button again will continue the display of the same menu fro m the beginning.

2. T o vi ew submenu items in a re ver se pattern: When the menu is selected and the submenu items are displayed press the up scroll button When the beginning of the list is reached, pressing the up scroll button again will continue the display of the same menu from the end.

Numeric keypad

Numbers 0 through 9 and Alpha characters, A through F, are used for activating menu items. Numbers 0 through 9 are used to enter parameters settings.

* (Shift)

Alpha characters are activated by pressing the shift key before each alpha keystroke.

Examples

(Quick) #

Quick return to the main menu choices.

Following are two examples:

EXAMPLE #1. To activate a menu item when menu selection is known

, either by seeing in the display or remembered from use, press the desired menu item number. The display will automatically update by activating (flashing) the desired selection. Press Enter to complete the selection. To use the alpha characters: Submenu 2=DTE Options, submenu of 1=Local, submenu of 3=Configuration has more than 9 choices. Submenu items A and B must be selected with the * (Shift) key. When the 2=DTE OPTIONS menu is flashing, press ENTER. Use the scroll to display submenu item A or B. Press the * (shift) key then, press

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Operation

the desired letter. If the letter is mistakenly pressed without using the * key, the numbered item will become active. To correct, repeat the correct procedure.

EXAMPLE #2. To enter a numeric entry, press the desired numbers at

the cursor position, followed by pressing ENTER.

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ConnecT 56K DSU User Manual

Menu structure

The ConnecT 56K DSU uses a multilevel menu approach to access its many features. All menu operations are displayed in the LCD window.

The opening menu is the access point to all other operations. There are three main menu items, 1=Status, 2=Test, 3=Configuration and an optional fourth item, 4=Dial. The Dial menu is available only when Accunet SW56 or US Sprint SW56 is selected as the Network Type from the Network Opt., submenu of Configuration Main Menu.

Each Main Menu item has several f unctions and s ubmenus to id enti fy and access specific parameters. In the discussions that follow each main menu contains a menu diagram to identify the location of each operation.

LCD display of opening Menu:

1=STATUS 2=TEST 3=CONFIG 4=DIAL

The four opening menu functions

This section discusses the four opening menu options.

1=Status

Used to display all relevant information for the network and DTE interfaces. Displays current Operating Data Mode, Loop Status, Rate of service from the network, DTE Data Rate and Format and DTE Interface Lead status. System will return to the Status display when idle.

2=Test

Used to control local and remote testing. Selects local or remote testing, defines unit address for remote testing, and selects type of test and test pattern when required.

3=Config

Used to select all desired network and DTE operating parameters. When certain Loop Rates (64K or 56SC are selected, a scramble option submenu is displayed in lieu of the DTE Rate menu to control scrambling).

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Operation

4=Dial

Provides manual dialing functions. This menu item is displayed and available for use only when the Accunet SW56 or US Sprint SW56 is selected as the Network Type from the Network Opt. Menu.

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ConnecT 56K DSU User Manual

General operations and menus

This section discusses general operations and menus for the ConnecT 56K DSU.

General operations and menus

General operation method

Following is a list of general operations and how to execute them. Activate The initial pressing of any Number will “activate” (cause

to flash) that numbered menu item.

Display Use the up and down Scroll keys to display menu choices.

In this manual, choices are listed in order using the down scroll button. When all menu items have been displayed, continued pressing of the scroll button will repeat the menu display list. Using the up scroll key will move through selections in reverse order.

Select Pressing the Enter button will enter into use of the

activated menu item which will offer further choices. If the activated item is a parameter choice, it will be entered into the system. The message “Command Accepted” will briefly display before returning to the currently active menu/submenu item.

Abort To abort any operation, press the Cancel button or the #

(Quick), number symbol, button. The system will return to the main m e nu.

Exit Menu flows end with the selection of a parameter and the

brief display of “Command Accepted” or other message, after which the display will return to the active menu item. Menu selection may resume o r usin g Cancel or # (Quick ) may be desired. If no further operation follows, the system will return to the Status display.

Menu map

The operation of the ConnecT 56K DSU is accomplished via use of multi level menus. The operation of each menu item will begin with a menu map. Each identified selection of a menu is separated by a slash (/) mark. For example the, Menu Map

3=Config/1=Local/3=Test Options/1=Test TIMEOUT/(Parameter)

would be operated by the following method:

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Operation

From the opening Main Menu

1= STATUS 2=TEST 3= CONFIG 4=DIAL

press the number 3 to activate (begin flashing) 3=CONFIG. When the menu 3=CONFIG is flashing, press the Enter button to select,

resulting in the displaying of two lines of submenu items.

1= LOCAL 2= REMOTE

Press the number 1 to activate (begin flashing) the Submenu 1= LOCAL. Press Enter to select the activated submenu, resulting in the displaying of two lines of submenu items.

1= NETWORK OPT. 2= DTE OPTIONS

Use the down scroll button to display menu items 3=TEST OPTIONS and 4=DIAL OPTIONS.

3= TEST OPTIONS 4= DIAL OPTIONS

3-8

Press the number 3 to activate the Submenu 3=TEST OPTIONS. Press Enter to select the activated submenu resulting in the displaying of two lines of submenu items.

1=TEST TIMEOUT 2=RDL EN/DIS

Press the number 1 to activate the Submenu TEST TIMEOUT resulting in the displaying of system prompts to enter the desired parameters.

ENTER TIMEOUT (0=OFF) : 1 SEC.

Use the number keys to enter the number of seconds desired for the Timeout. Press Enter to configure this system parameter resulting in the system responding with an acceptance or rejection of the command and returning to the previous submenu.

ConnecT 56K DSU User Manual

1 = STATUS

The Status Selection displays two lines at a time of the current operational status of the network and the DTE interfaces. After 30 seconds of no front panel operation on the ConnecT 56K DSU, it automatically reverts to the status display.

Figure 3-2 Status Display

DATA MODE

LOOP IS NORMAL

Submenu items

1= STATUS

LOOP 56K

DTE 56SYNC

SR ON

LLB OFF

TR OFF

RLB OFF

Following are the submenu items:

Data Mode Loop is Normal:

Current operation mode of the ConnecT 56K DSU current status of the network interface.

Loop X DTE 56K Sync:

Indicates the rate of the service from the network. Indicates the DTE data rate and format.

TR SR LLB RLB: Off/On

Lists four of the DTE interface leads. State of the respective leads displayed immediately above.

Operation: Follow standard operating procedure.

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Operation

To view additional information, press the Up or Down scroll key which displays two new lines of information. To exit the Status menu, press the Cancel key.

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ConnecT 56K DSU User Manual

2 = TEST

The ConnecT 56K DSU is able to perform a variety of tests that allow problems to specific components of the communications circuit to be isolated and identified. These various test modes for the ConnecT 56K DSU are initiated and terminated from either the front panel or from the DTE interface. When operating in an asynchronous mode, AT commands can be used to control the testing from the DTE interface. For synchronous operation, V.25 bis commands can provide the test control.

The unit also responds to standard DDS network tests initiated from the TELCO test centers. In addition it can run several tests such as local and remote loopbacks to aid in problem isolation. There are six built in test patterns that can be used with both local and remote loopbacks. See Test Menu drawing on the following page.

Figure 3-3 Complete Test Menu

1=DTE & LOOP (LL)

2=LOOP ONLY (RT)

3=DTE ONLY

4=DTE WITH TP

5=TE S T PATTER N

6=SELF TEST

ENTER TEST UNIT ADDRESS: 00

2=TEST

1=LOCAL UNIT

2=REMOTE UNIT

1=EXIT TEST 2=DISPLAY STATUS

Menu flow is normally depicted from left to right. When scrolling through submenu items with the down scroll button, the flow will wrap from bottom to top and repeat the menu order. A “back up” can be

STATUS DISPLAYS

1=2047 P ATTERN 2=511 P ATTERN

3=STRESS PTRN #1 4=STRESS PTRN #2

5=STRESS PTRN #3 6=STRESS PTRN #4

1=204 7 PATTERN 2=511 PATTERN

3=STRESS PTRN #1 4=STRESS PTRN #2

5=STRESS PTRN #3 6=STRESS PTRN #4

SELF CHECK CHECKSUM XXXX

SELF TEST PASS

1=2047 PATTERN 2=51 1 PATT ERN

3=STRESS PTRN #1 4=STRESS PTRN #2

5=STRESS PTRN #3 6=STRESS PTRN #4

7=DATA FROM DT E

1=EXIT TEST 2=DISPLAY STATUS

STATUS DISPLAYS

1=EXIT TEST 2=DISPLAY STATUS

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Operation

effected by using the up scroll button. At e very le vel of the menu pressing the Cancel button will return to the previous menu level; used repeatedly the system will return to the main menu.

1=Local Unit

Figure 3-4 Local Unit Menu

1=DTE & LOOP (LL)

2=LOOP ONLY (RT)

3=DTE ONLY

4=DTE WITH TP

1=LOCAL UNIT

5=TE S T PATTER N

6=SELF TEST

Note:

Shaded items are restricted to specific configurations or operation.

The LOCAL UNIT selection is used to specify one of six different tests to be performed by the local ConnecT 56K DSU. The selections are shown as submenu selections 1 through six.

Displays

LOCAL DTE & LOOP

LOOP 56K

1=2047 P ATTERN 2=511 P ATTERN

3=STRESS PTRN #1 4=STRESS PTRN #2

5=STRESS PTRN #3 6=STRESS PTRN #4

1=204 7 PATTERN 2=511 PATTERN

3=STRESS PTRN #1 4=STRESS PTRN #2

5=STRESS PTRN #3 6=STRESS PTRN #4

SELF CHECK CHECKSUM XXXX

SELF TEST PASS

DTE 56K SYNC

LLB

OFF

LOOP 56K

SR OFF

OFF

LOOP 56K

SR OFF

OFF

LLB OFF

UNIT IN TEST LOOP IS NORMAL

DTE TEST

DTE 56K SYNC

UNIT IN TEST LOOP IS NORMAL

TEST P ATTERN TST ERR=00

DTE 56K SYNC

UNIT IN TEST LOOP IS NORMAL

RLB OFF

UNIT IN TEST LOOP IS NORMAL

SR OFF

LOOP 56K

SR OFF

OFF

LLB OFF

OFF

DTE 56K SYNC

LOCAL LOOP (RT)

DTE WITH TP TST ERR=00

DTE 56K SYNC TR

UNIT IN TEST LOOP IS NORMAL

RLB OFF

3-12

Menu map

2=TEST/1=LOCAL UNIT

ConnecT 56K DSU User Manual

2 = TEST

Operation

Follow standard operating procedure. When 2=TEST is flashing: Press the Enter button resulting in the displaying of the first two submenu items.

1=Local Unit 2=Remote Unit

Use the number 1 key to activate the 1=Local Unit Test submenu press the Enter key to enter the submenu resulting in the displaying of two submenu choi ces.

Table 3-3 Test Commands

Front Panel AT Command Description

1=DTE & LOOP (LL) &T10 TD/RD and RX/TX Loopbacks 2=LOOP ONLY (RT) &T11 RX/TX Loopback with DTE

3=DTE ONLY &T1 TX/RX Loopback at network

4=DTE WITH TP &T8 TX/RX Loopback with test pattern 5=TEST P ATTERN &T9 T ransmit/receive test pattern 6=SELF TEST NA Check internal components

interface

1 = DTE & LOOP (LL)

The DTE and LOOP test splits the ConnecT 56K DSU into separate DTE and loop interface sections and then loops the receive data of each interface back to its respective transmit data. A block diagram illustrating the loopback points and the signal paths for this test is shown in Table A-1, “DTE and Loop Test Diagram,” on page A -8.

When the LL lead from the DTE is activated, the test described above is also performed by the ConnecT 56K DSU. The ConnecT 56K DSU acknowledges this DTE activated test by activating the TM on the DTE interface.

This particular test permits the separate sections of the ConnecT 56K DSU to be checked. First, it allows the local DTE interface drivers and receivers to be tested with an external data analyzer or data from the DTE device. Second, it allows the loop interface section of the local DSU to be tested from the remote site over the actual communications circuit.

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Operation

Testing from the remote end of the circuit is normally done with a bit error rate tester (BERT) or, by using an internal Test Pattern Generator on the Remote DSU Unit.

Figure 3-5 Status Display

DTE & LOOP

LOOP 56K

DTE 56K SYNC

1=DTE & LOOP (LL)

TR OFF

UNIT IN TEST LOOP IS NORMAL

OFF

LLB OFF

RLB OFF

Menu map

2=TEST/1= LOCAL UNIT /1=DTE & LOOP(LL)/Displays

Operation

Follow standard operating procedures. When 1=DTE & LOOP (LL) is flashing: Press the Enter button to initiate the test resulting in the system briefly displaying “Please Wait” after which it displays the type of test being performed.

DTE & LOOP

3-14

Use the scroll buttons to continue viewing the other test results.

Table 3-4 Test Displays

DTE & Loop Type of test being performed Loop 56K Loop rate DTE 56K Sync DTE rate and data type

Table 3-5 Available Interface Leads

TR Terminal Ready Input SR Set Ready Output LLB Local Loopback Input RLB Remote Loopback Input OFF/ON State of the respective lead s displayed immediately

above. Unit in Test Operating mode to ConnecT 56K DSU Loop is Normal Status of network service

ConnecT 56K DSU User Manual

2 = TEST

To Exit a Test press the Quick # key to access the 1=EXIT TEST/ 2=DISPLAY STATUS submenu or press the Cancel key to change from the status display to the main menu resulting in the TEST selection being active (flashing). Press the Enter key resulting in the alternate test control menu being displayed.

1=EXIT TEST 2=DISPLAY STATUS

1=EXIT TEST Terminates the test in progress and returns

2=DISPLAY STATUS Re-enters test display for additional viewing.

Table 3-6 Submenu Test Commands

Front Panel AT Command Description

1=EXIT TEST &T0 Stops test/returns to da ta mode. 2=DISPLAY STATUS NA Displays present test status

the ConnecT 56K DSU to the main menu.

2 = LOOP ONLY (RT)

With the LOOP ONLY (RT) test, the network receive data is looped to the network transmit Path inside the DTE interface section of the ConnecT 56K DSU. The physical DTE interface is ignored for this test. A block diagram illustrating the loopback point and the signal paths for this test is shown in Table A-2, “Loop Only Test Diagram,” on page A -9.

This test allows the loop interface and a major portion of the DTE interface for the local ConnecT 56K DSU to be tested from the remote site over the actual communications circuit. Like the DTE and LOOP (LL) test, the test from the remote site is usually done with a BERT tester.

While this test is being performed, the message, LOCAL LOOP (RT), is shown on the ConnecT 56K DSU display. The other status messages shown in the menu drawing are accessible by using the UP/DOWN SCROLL keys.

The loopback point within the ConnecT 56K DSU and its operation for LOOP ONLY (RT) test are the same as the Remote Digital Loopback (RT) test initiated and controlled from a remote DSU.

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Operation

Figure 3-6 Status Display

UNIT IN TEST LOOP IS NORMAL

LLB

2=LOOP ONLY (RT)

OFF

LOOP 56K

DTE 56K SYNC

LOCAL LOOP (RT)

OFF

RLB

OFF

Menu map

2=TEST/1= LOCAL UNIT/2=LOOP ONLY (RT)/Displays

Operation

Follow standard operating procedures. When 2=LOOP ONLY (RT) is flashing: Press the Enter button resulting in the system briefly displaying “Please Wait” after which it displays the first of the test results.

LOCAL LOOP (RT)

Continue with operational procedures described for DTE & LOOP (LL).

3-16

3 = DTE ONLY

The DTE ON LY test pr ovides a method for testing both the DTE interface drivers and receivers of the local ConnecT 56K DSU plus its loop transmitter and receiver. For this test, the loop transmit data is connected to the loop receive data at a point close to the physical network interface. The data is then sent back towards the DTE. The transmit circuit to the network is terminated in a zero condition for this test. A block dia gram illustrating the loop back point and the signal paths for this test is shown in Table A-3, “DTE Only Test Diagram,” on pageA-9.

Test patterns from an external BERT tester are routed through the DTE interface section of the ConnecT 56K DSU and then to the output of the loop transmitter section where the signal is encoded for transmission. Instead of being coupled onto the physical transmit circuit of th e network, the output of the loop transmitter is coupled back to the loop receiver input where the signal is then decoded and returned to the BERT tester where the serial receive data stream is checked for any bit errors.

This test is used to verify proper operation of both the DTE and loop interface sections of the local ConnecT 56K DSU.

ConnecT 56K DSU User Manual

2 = TEST

Figure 3-7 Status Display

DTE TEST

LOOP 56K

DTE 56K SYNC

3=DTE ONLY

OFF

LLB OFF

UNIT IN TEST LOOP IS NORMAL

RLB

OFF

Menu map

2=TEST/1= LOCAL UNIT/3=DTE ONLY/Displays

Operation

Follow standard operat i ng procedures. When 3=DTE Only is flashing : Press the Enter button resulting in the system briefly displaying “Please Wait” after which it displays the first of the test results.

DTE TEST

Continue with operational procedures described for DTE & LOOP (LL).

4 = DTE WITH TP

The DTE WITH TP (test pattern) test is similar to the DTE ONLY test described above. Instead of using an external BERT tester connected to the DTE interface, this test uses the internal test pattern generator and detector built into the ConnecT 56K DSU. The loopback point and the data paths for this test are illustrated in Tab leA-4, “DTE With Test Pattern Diagram,” on page A-10. This test is primarily used to test the transmitter and receiver sections of the local ConnecT 56K DSU.

The internal test pattern generator and detector of the ConnecT 56K DSU operate with one of six different data patterns. When DTE WITH TP test is selected, the particular test pattern to be transmitted by the generator must also be selected. When a selection is made, the test pattern detector examines the receive data stream until synchronization to the specified pattern is achieved. Once synchronized, the detector continues to check the receive data and reports any bit errors detected.

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Operation

Figure 3-8 DTE WITH TP MENU

Displays

DTE WITH TP TST ERR=00

LOOP 56K

DTE 56K SYNC

SR OFF

LLB OFF

TR OFF UNIT IN TEST

LOOP IS NORMAL

RLB OFF

4=DTE WITH TP

1=2047 PATTERN 2=511 PATTERN

3=STRESS PTRN #1 4=STRESS PTRN #2

5=STRESS PTRN #3 6=STRESS PTRN #4

Menu map

2=TEST/1= LOCAL UNIT/4=DTE WITH TP/Submenus 1-6/Displays

Operation

Follow standard operating procedures. When 4=DTE With TP is flashing: Press the Enter button resulting in the system briefly displaying “Please Wait” after which it displays the first of the test results.

1=2047 PATTERN 2=511 PATTERN

Continue with operational procedures described for DTE & Loop (LL).

3-18

1=2047 Pa ttern Selects the 2047 Pattern 2=511 Pattern Selects the 511 Pattern 3=Stress Pattern #1 Selects DDS Stress Pattern 1 4=Stress Pattern #2 Selects DDS Stress Pattern 2 5=Stress Pattern #3 Selects DDS Stress Pattern 3 6=Stress Pattern #4 Selects DDS Stress Pattern 4

Table 3-7 DTE With Test Pattern Commands

Front Panel AT Command Description

1=EXIT TEST _T0 Standard 2047 random data pattern 2=DISPLAY STATUS _T1 Standard 511 random data pattern 3=STRESS PTRN #1 _T2 DDS stress pattern #1 4=STRESS PTRN #2 _T3 DDS stress pattern #2 5=STRESS PTRN #3 _T4 DDS stress pattern #3 6=STRESS PTRN #4 _T5 DDS stress pattern #4

ConnecT 56K DSU User Manual

2 = TEST

While this test is being performed, the ConnecT 56K DSU displays:

DTE WITH TP TEST ERR=XX

The first line of the display indicates the type of test being performed while the second line of the display indicates the number of errors accumulated by the test pattern detector.

If errors occur during this test, the TEST ERR display can be reset to zero, by pressing the “1” key. To verify proper operation of this test, single bit errors can be injected into the transmitted test pattern by pressing the “2” ke y. These errors will appear on the TEST ERR displa .

5 = Test Pattern

The TEST PATTERN selection actually converts the local ConnecT 56 DSU into a BERT tester for use in testing a remote DSU over the actual communications circuit. With this test the remote DSU can be looped back in either the DTE and LOOP (LL) or the LOOP ONLY (RT) mode. Instead of being looped back the remote DSU can operate in the data mode with data supplied from an external BERT tester, or it can be operating in the TEST PATTERN mode. The data paths for this mode are illustrated in Table A-5, “Test Pattern Only Diagram,” on page A-10.

When this test selection is chosen the system presents the same test patterns as for DTE With TP.

Displays

5=TE S T PATTER N

1=204 7 PATTERN 2=511 PATTERN

3=STRESS PTRN #1 4=STRESS PTRN #2

5=STRESS PTRN #3 6=STRESS PTRN #4

TEST P ATTERN TST ERR=00

LOOP 56K

DTE 56K SYNC

SR OFF

LLB OFF

TR OFF

UNIT IN TEST LOOP IS NORMAL

RLB OFF

Menu map

2=TEST/1= LOCAL UNIT/5=TEST PATTERN/Submenus 1-6/Displays

Operation

Follow standard operating procedures. When 5=TEST PATTERN is flashing: Press the Enter button resulting in the system briefly displaying “Please Wait” after which it displays the first of the test results.

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Operation

1=2047 PATTERN 2= 511 PATTERN

Continue with operational procedures described for DTE & Loop (LL).

6 = Self test

The Self Test is set designed to verify current operation of the ConnecT 56K DSU. It can be performed at any time and is recommended if there is any question about the current DSU health.

SELF CHECK

6=SELF TEST

CHECKSUM XXXX SELF TEST

PASS

Menu map

2=TEST/1= LOCAL UNIT/6=SELF TEST

Operation

Follow standard operating procedures. When 6=Self Test is flashing: Press the Enter button resulting in the LEDs being active as the system runs the self test, displays the results, and then returns to the Main Menu display.

2=Remote unit

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ConnecT 56K DSU User Manual

SELF TEST CHECKSUM XXXX

Self Test Pass = indicates no problem with the operation. Self Test Checksum XXXX = the software version.

The Remote Unit submenu allows the placement of a remotely installed DSU into Loopback. This also applies to DSUs installed in a multi-point network. After placing the remote DSU into loop a choice of 6 Test Patterns or Data from the DTE may be selected. Test pattern results are then displayed.

2 = TEST

REMOTE WITH TP TST ERR=00

LOOP 56K

DTE 56K SYNC

SR LLB RLB

OFF OFF

OFF

UNIT IN TEST LOOP IS NORMAL

2=REMOTE UNIT

ENTER TEST UNIT ADDRESS: 00

1=2047 PATTERN 2=511 PATTERN 3=STRESS PTRN #1 4=STRESS PTRN #2

5=STRESS PTRN #3 6=STRESS PTRN #4

7=DATA FROM DT E

Menu map

2=Test/2=Remote Unit/Selections

Operation

Follow standard operating procedures. When 2=Remote Unit is flashing, press the Enter button resulting in the displaying of the prompt to enter the Test Unit Address.

Enter Test Unit Address:XX

Use the number keys to type the address of Remote DSU press the Enter key to enter the address into the system resulting in the displaying of the first of the submenu items.

1=2047 Pattern 2=511 Pattern

Continue with standard operating procedures to select menu options. At the end of the options the system will briefly display “Command accepted” and return to the status menu.

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Operation

Status Displays

Remote With TP TEST Err - 00

Table 3-8 Test Displays

Local DTE & Loop Type of test being performed Loop 56K Loop rate DTE 56K Sync DTE rate and data type

Table 3-9 Available interface leads

TR Terminal Ready Input SR Set Ready Output LLB Local Loopback Input RLB Remote Loopback Input OFF/ON State of the respective lead s displayed immediately

above. Unit in Test Operating mode to ConnecT 56K DSU Loop is Normal Status of network service

3-22

1 = Exit Test and 2 = Display Status

The menu choices here are used to immediately exit the test selection or to re-enter status display. These menu items are available only after tests have been performed.

1=EXIT TEST Will effectively exit the testing process

returning to the Main Menu for selection.

2=DISPLAY STATUS Re-enters test display for additional

viewing.

When a test has been requested, the system briefly displays “Please Wait” before presenting the first test display. At any test result display: Press the Quick # key to access the 1=EXIT TEST/2=DISPLAY STATUS submenu or press the Cancel key to change from the status display to the main menu resulting in the TEST selection being active (flashing).

ConnecT 56K DSU User Manual

1=LOCAL UNIT

2=TEST

2=REMOTE UNIT

1=EXIT TEST 2=DISPLAY ST ATUS

Menu map

2=TEST/1=LOCAL UNIT or REMOTE UNIT/Tests/1=EXIT TEST or 2=DISPLAY STATUS

2 = TEST

Note:

Shaded items are restricted to specific config u rations or operation.

Press the Enter key resulting in the alternate test control menu being displayed.

1=EXIT TEST 2=DISPLAY STATUS

1=Exit Test Terminates the test in progress and

2=Display Status Re-enters test di splay for additi onal

returns the ConnecT 56K DSU to the data mode.

viewing.

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Operation

3 = CONFIG

The Configuration menu consists of a group of five sub-menus relati ng to a specific interface or function of the ConnecT 56K DSU that requires set up.

T able 3-10 Configuration submenus

1=Network Opt. Network Interface Parameters 2=DTE Options DTE Interface Parameters 3=Test Options Unit Test Options 4=Dial Options Unit Dialing Options 5=Manual Command

The ConnecT 56K DSU contains four different user profiles (sets of configurations options) that are stored in rea d only memory. The unit is shipped from the factory with profile number 1 (default configuration) loaded into the current (non-volatile configuration) memory. If profile 1 matches requirements for the system, then no additional configuration is required to put the unit into service. If profile 1 does not match system requirements, it can be modified, or one of the other profiles that more closely matches the system requirements can be loaded into current memory. When a different profile is loaded, or the existing profile is modified, it is stored in the current (non-volatile configuration) memory. The ConnecT 56K DSU is then configured with that profile every time power is turned on or until the unit is reset.

Operation

3-24

ConnecT 56K DSU User Manual

See Configuration drawing on the following page.

Table 3-11 Submenus of 3=Config

1= LOCAL Configuration submenus are available to set all

the configuratio n paramet ers by manual operation of the front panel.

2= REMOTE Establishes communication with the remote DSU

so the front panel of t he local DSU c an be used to configure the remote DSU

Follow standard operating procedures. When 3=CONFIG is flashing.

3 = CONFIG

Figure 3-9 Complete Configuration Menu

See Additional

Submenu Items 1-5 Submenu 4 is Path to Enabling Main Menu 4=Dial

See Additional Submenu Items 1-9, A-B

See Additional Submenu Items 1-4

1=PHONE NUMBER

2=AUTO ANSWER

3=CONFIG

1=LOCAL

2=REMOTE

ENTER

1=NETWORK OPT.

2=DTE OPTIONS

3=TEST OPTIONS

4=DIAL OPTIONS

ADDRESS

5=MANUAL COMMAND

Menu flow is normally depicted from left to right. When scrolling through submenu items with the down scroll buttons, the flow will wrap from bottom to top and repeat the menu order. A “back up” can be effected by using the up scroll b utton. A t eve ry le vel of the menu pressing the Cancel button will return to the previous menu level; used repeatedly the system will return to the main menu.

Press the Enter button to enter the Configuration mode. This results in displaying the two submenu choices:

1=LOCAL 2=REMOTE

1=Network Options

Use the “1” number to activate the 1=Local Menu. Press the Enter key to enter the Local submenus. This displays the first two submenu choices.:

1=Network Opt 2=DTE Options

Offers the choices of the configuration parameters that control the loop operation of the ConnecT 56K DSU.

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3-25

Operation

1=LOOP RATE

2=NETWORK ADDR.

3=REMOTE CONFIG.

1=NETWORK OPT.

4=NETWORK TYPE

5=CLOCK SOURCE

8 Choices

DISABLE ENABLE

1=DDS 2=ACCUNET SW56

3=US SPRINT SW56

2 Choices

Enables Main Menu 4=Dial

Menu map

3=CONFIG/1=LOCAL/1=NETWORK OPT.

Operation

Follow standard operating procedures. When 1=NETWORK OPT. is flashing, press the Enter button. This displays the first of the submenu items.

1=LOOP RATE 2=NETWORK ADDR.

Continue with standard operating procedures to select menu options. At the end of the options the system will briefly display “Command Accepted” and return to the active menu.

3-26

Non-standard operation

If submenu 1 or 8 is selected the system will briefly display “Command Accepted” and return to the active Loop Rate menu. If any submenu 2 through 7 is selected the system will prompt for a selection of:

1=No Second Channel 2=Second Channel.

If this option is presented, continue the same operation to arrive at the display of “Command Accepted.”

ConnecT 56K DSU User Manual

3 = CONFIG

Submenu 1 loop rate

The LOOP RATE option sets the loop operating speed. The unit should be set to the rate required by the DDS Service. The ConnecT 56K DSU also supports subrate DTE data over a 56K loop. The loop rate must be set independen tly of the DTE rate.

Eight loop rate elections are available. After selecting any loop rate other than Auto or 64K (1 or 8), the option for a secondary channel is available. The various loop rates and format selections are listed below with the equivalent AT commands that perform the same configuration functions.

Table 3-12 Loop Rate Commands

Front Panel AT Command Selections Description

1=AUTO %B0 DSU auto rate adapts to

2=2.4K NO SEC. CH %B1 2.4K with no secondary

3=4.8K NO SEC. CH %B2 4.8K with no secondary

4=9.6K NO SEC. CH %B3 9.6K with no secondary

5=19.2K NO SEC. CH %B4 19.2K with no secondary

6=38.4K NO SEC. CH %B5 38.4K with no secondary

7=56K NO SEC. CH %B6 56K with no secondary

8=64K NO SEC. CH %B7 64K with no secondary

2=2.4K SEC. CH %B9 2.4K with secondary channel 3=4.8K SEC. CH %B10 4.8K with secondary channel 4=9.6K SEC. CH %B11 9.6K with secondary channel 5=19.2K SEC. CH %B12 19.2K with secondary

6=38.4K SEC. CH %B13 38.4K with secondary

7=56K SEC. CH %B14 56K with secondary channel

network

channel

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3-27

Operation

Submenu 2 network

A two digit decimal address can be assigned to each ConnecT 56K DSU. This addressing capability makes it possible to perform remote configuration and testing in Point to Point and a multi-drop network.

Use the numbers keys to select an address press the Enter key to enter the address into the system resulting in the system briefly displaying “Command Accepted” and returning to the active Network Address menu.

Table 3-13 Network Address Commands

Front P anel AT Command Selections De scripti on

XX (Decimal) _N=xx Assigns a 2 digit Network Address

Submenu 3 remote configuration

This option sets up the ConnecT 56K DSU to accept or reject remote configuration commands. Use the number of the desired mode to activate the selection press Enter to select the mode resulting in the system briefly displaying “Command Accepted” and returning to the active Network Opt. menu with the REMOTE CONFIG. selection active.

3-28

Table 3-14 Remote Configuration Commands

Front Panel AT Command Selections Description

1=DISABLE &P4 Disable Remote Configuration 2=DISABLE &P5 Enable Remote Configuration

Submenu 4 network type

The Network Type option configures the ConnecT 56K DSU for the specific type of network being used. Use the number of the desired network type to activate the selection press Enter to select the network type resulting in the system briefly displaying “Command Accepted” and returning to NETWORK OPT. menu with the NETWORK TYPE selection active.

Note:

ConnecT 56K DSU User Manual

Additional menus become available when using the Accunet SW 56 or the US Sprint SW56. See Main Menu 4=Dial at the end of the menu section.

3 = CONFIG

Table 3-15 Network Type Commands

Front Panel AT Command Selections Description

1=DDS &L0 Any 4-wire DOS network 2=DDS &L1 ATT&T Switched 56 Service 3=US SPRINT SW56 &L2 Sprint Switched 56 Service

Submenu 5 clock sour ce

The Clock Source options specifies the timing source for the ConnecT 56K DSU s internal circuitry. When Operating on a DDS network, the timing should be FROM NETWORK. On a point to point private network, one ConnecT 56K DSU must be set for MASTER, the other set for FROM NETWORK.

Table 3-16 Clock Source Commands

Front Panel AT Command Selections Description

1=MASTER _X0 DSU is the master timing

source

2=FROM NETWORK _X1 Network RX Signal is timing

source

2 = DTE options

Used to select the configuration parameters that control the operation of the DTE Interf ace of the ConnecT 56K DSU.

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3-29

Operation

6 Choices 1=SCRAMBLER OFF

2=SCRAMBLER ON 3=DATA INVERT

1=RS-232 2=V.35

Additional Submenus 4 Choices 2 Choices

5 Choices 4 Choices

3 Choices

4 Choices

6 Choices

7 Choices

2=DTE OPTIONS

1=DTE RATE

2=CONNECTOR TYPE

3=DATA FO R M AT 4=DTE CMD OPTION

5=TRANSMIT CLOCK 6=CS OPTIONS 7=ANTI-STREAM

8=CD OPTIONS

9=TR OPTIONS

A=SR OPTIONS B=SECONDARY RATE

Menu map

3=CONFIG/1=LOCAL/2=DTE OPT.

Operation

Follow standard operating procedures. When 2=DTE OPT. is flashing: Press the Enter button resulting in the displaying of the first of the submenu items .

3-30

1=DTE Rate 2=Connector Type

Note:

Continue with standard operating procedures to select menu options. At the end of the options the system will briefly display “Command Accepted” and return to the active menu.

ConnecT 56K DSU User Manual

Shaded items are restricted to specific config u rations or operation.

3 = CONFIG

Submenu 1 DTE rate

The DTE RATE option sets the operating speed of the DTE interface when the unit is set for 56K. The ConnecT 56K DSU supports six different DTE rates over a 56K Loop.

Use the number of the desired DTE RATE to activate the selection press Enter to select the DTE Rate resulting in the system briefly displaying “Command Accepted” and returning to the DTE OPTIONS menu with the DTE RATE selection active.

If a loop rate of 56k or 64K was chosen during NETWORK OPT. configuration, then the following DTE RATE menu is shown:

Table 3-17 DTE Rate Commands

Front Panel AT Command Description

1=DTE 56K/57.6K %K8 DTE rate: 56K sync or 57.6K

2=DTE 2.4K %K3 DTE rate 2.4K sync and async 3=DTE 4.8K %K4 DTE rate 4.8K sync and async 4=DTE 9.6K %K5 DTE rate 9.6K sync and async 5=DTE 19.2K %K6 DTE rate 19.2K sync and async 6=DTE 38.4K %K7 DTE rate 38.4K sync and async

async

If a loop rate of 56k with secondary channel or 64K was chosen during NETWORK OPT. configuration, then the following DTE RATE menu is shown:

Table 3-18 Loop Rate of 56K

Front Panel

1=SCRAMBLER OFF _F0 DTE data scrambler disabled 2=SCRAMBLER ON _F1 DTE data scrambler enabled 3=DATA INVERT _F2 DTE data invert enabled

Note:

For point-to-point operation at 56K with secondary channel, the

AT Command

Description

network requires that both the primary and secondary channel data not be zero simultaneously. For those applications where HDLC protocol is being used, the above constraint can be eliminated by selecting the DATA INVERT OPTION. The

ConnecT 56K DS User Manual

3-31

Operation

constraint can also be eliminated by selecting the SCRAMBLER ON option.

For 64K clear channel operation, there is a possibility that the DTE data sequences might mimic network loop maintenance functions and erroneously cause other network elements to activate loopbacks. To prevent this, the SCRAMBLER ON option should be selected for this mode of operation.

The SCRAMBLER ON option must be selected in both the local and remote Con necT 56K DSU for the situations described above, and it must never be used for multi-point operation.

Submenu 2 connector type

The CONNECTOR TYPE option is used to specify which of the PRIMARY CHANNEL connectors is used to connect to the Data Terminal Equipment.

Menu map

3=CONFIG/1=Local/2=DTE Opt.

3-32

Operation

Follow standard operating procedures. When 2=DTE OPT. is flashing: Press the Enter button resulting in the displaying of the first of the submenu items .

1=RS-232 2=V.35

Continue with standard operating procedures to select menu options. At the end of the options the system will briefly display “Command Accepted” and return to the DTE OPTIONS menu.

Table 3-19 Connector Type Commands

ConnecT 56K DSU User Manual

Front Panel

1=RS232 2=V.35

AT Command

Not applicable Not applicable

Description

EIA 232 interface enabled V.35 interface enabled

3 = CONFIG

Submenu 3 data format

The DATA FORMAT option is used to select either the synchronous or asynchronous mode of operation for the DTE interface.

3=DATA F ORMA T

1=ASYNCHRONOUS 2=SYNCHRONOUS

1=ASYNC 9 BITS 2=ASYNC 10 BITS

3=ASYNC 11 BITS

Menu map

3=CONFIG/1=Local/2=DTE Opt./3=Data Format

Operation

Follow standard operating procedures. When 3=DATA FORMAT is flashing: Press the Enter button resulting in the displaying of the first of the submenu items.

1=ASYNCHRONOUS 2=SYNCHRONOUS

Continue with standard operating procedures to select menu options. At the end of the options the system will briefly display “Command Accepted” and return to DTE OPTIONS menu.

Note:

If the asynchronous option is chosen, the length of the data bytes must be selected.

Use the number of the desired submenu choice to activate the desired async format press Enter to enter the selected choice into the system resulting in the system briefly displaying “Command Accepted” and returning to the DTE OPTIONS menu with the Data For selection active.

Table 3-20 Data Format Commands

Front Panel

AT Command

Description

1=ASYNCHRONOUS &Q0 Always asynchronous 2=SYNCHRONOUS &Q2 Always synchronous For asynchronous options, select the length of the data bytes.

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Operation

Front Panel

1=ASYNC 9 BITS

2=ASYNC 10 BITS

3=ASYNC 11 BITS

AT Command

Not applicable

Description

9 bits including start, stop, parity

10 bits including start, stop, parity

11 bits including start, stop, parity

Submenu 4 DTE CMD option

The DTE COMMAND option is used to enable the DTE interface for one of the three different command modes.

3=CONFIG/1=Local/2=DTE Opt./4=DTE CMD Option

Follow standard operating procedures. When 4=DTE CMD OPTION is flashing: Press the Enter button resulting in the displaying of the first of the submenu items.

1=Disabled 2=AT Command Set

Continue with standard operating procedures to select menu options. At the end of the options the system will briefly display “Command Accepted” and return to the active menu.

3-34

Table 3-21 DTE CMD Commands

Front Pa nel

1=DISABLED

2=AT COMMAND SET

3=V.25 SNYC

4=V.25 BSC/ASNYC

ConnecT 56K DSU User Manual

AT Command

Not applicable

Description

Disables all DTE command modes

Enables AT commands from DTE

Enables V.25bis (SDLC) commands

Enables V.25 (BISYNC and ASYNC)

3 = CONFIG

Submenu 5 transmit clock

The Transmit Clock option is used to select the source of the clock used to transfer data from the DTE into the ConnecT 56K DSU.

Menu map

3=CONFIG/1=Local/2=DTE Opt./5=Transmit Clock

Operation

Follow standard operating procedures. When 5=TRANSMIT CLOCK is flashing: Press the Enter button resulting in the displaying of the first of the submenu items.

1=Normal 2=External

Continue with standard operating procedures to select menu options. At the end of the options the system will briefly display “Command Accepted” and return to the DTE OPTIONS menu with the Transmit Clock selection active.

Table 3-22 Transmit Clock Commands

Front Panel

1=NORMAL &X0 TX clock from DSU selected 2=EXTERNAL &X1 ETC clock from DTE selected

Note:

The EXTERNAL clock option is normally used in modem tail

AT Command

Description

circuit applications. A DSU to modem interconnect diagram for this application is shown in Table A -6, “DSU to Modem Interconnect Diagram,” on page A-11.

The EXTERNAL clock option is also recommended when the EIA 232 connector is used for 56 KB/s and 64 KB/s applications. A special DSU cable diagram for this application is shown in Table A -7, “EIA 232 Connector for 56 KB/s and 64 KB/s Application,” on pag eA-11. Using this option and special cable eliminates data errors caused by excessive delays in the DTE transmit clock receiver and transmit data driver.

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Operation

Submenu 6 CS options

The CS OPTIONS menu is used to select one of five different control modes for the Clear to Send (CS) lead.

Menu map

3=CONFIG/1=Local/2=DTE Opt./6=CS Options

Operation

Follow standard operating procedures. When 6=CS OPTIONS is flashing: Press the Enter button resulting in the displaying of the first of the submenu items.

1=Forced On 2=Follows RS

If one of the options chosen involves request to send (RS), then the delay from RS to CS is selected.

Continue with standard operating procedures to select menu options. At the end of the options the system will briefly display “Command Accepted” and return to the active menu or display choices for the delay.

3-36

Table 3-23 CS Options Commands

Front Panel

1=FORCED ON &R0 C S always ON 2=FOLLOWS RS &R1 CS state same as RS state 3=FOLLOWS CD &R2 CS state same as CD state 4=FOLLOWS RS+CD &R3 CS state same as RS and CD

5=OFF WITH LOCD &R4 ON except 5 seconds after

If one of the options chosen involves request to send (RS), select the delay from RS to CS.

1=CS DELAY SHORT _D0 Short Delay from RS to CS

2=CD DELAY LONG _D1 Long Delay from RS to CS

ConnecT 56K DSU User Manual

AT Command

Description

state

disconnect in switched 56 applications.

selected

3 = CONFIG

Specified times for the SHORT and LONG delays at the different operating speeds are:

Rate Short Delay Long Delay

64 1.1ms 16.1ms 56 1.1ms 16.1ms

19.2 1.5ms 16.5ms

4.8 1.5ms 16.5ms

2.4 1.5ms 16.5ms

Submenu 7 anti -stream

The ANTI-STREAM option is used to select the anti-stream timeout. The anti-stream timeout is the maximum time the ConnecT 56K DSU transmits data into the network from the DTE. This feature prevents one DTE device on a multi-drop network from continuously tieing up the transmit circuit back to the master DSU.

The anti-stream timer is reset to zero when RS transitions to the active state and is updated every second while RS is active. When the antistream timeout expires, the ConnecT 56K DSU stops transmitting DTE data into the network but continues to accept data from it. This condition exists until the DTE deactivates the RS input.

Menu map

3=CONFIG/1=Local/2=DTE Opt./7Anti-Stream

Operation

Follow standard operating procedures. When 7=ANTI-STREAM is flashing: Press the Enter button resulting in the displaying of the first of the submenu items.

1=Timer Off 2=Time 10 Sec.

Note:

If one of the options chosen involves request to send (RS), then the delay from RS to CS is selected.

ConnecT 56K DS User Manual

3-37

Operation

Continue with standard operating procedures to select menu options. At the end of the options the system wilL briefly display “Command Accepted” and return to the DTE OPTIONS menu with the Anti-Stream selection active.

Table 3-24 Anti-Stream Commands

Front Pa nel

1=TIMER OFF %T0 Anti-stream timer disabled 2=TIME 10 SEC. %T1 Timeout equals 10 seconds 3=TIME 30 SEC. %T2 Timeout equals 30 seconds 4=TIME 60 SEC. %T3 Timeout equals 60 seconds

AT Command

Description

Submenu 8 CD options

The CD OPTIONS menu is used to select one of three different control modes for the receive line signal detector (CD) lead.

Menu map

3=CONFIG/1=Local/2=DTE Opt./8=CD Options

Operation

Follow standard operating procedures. When 6=CS OPTIONS is flashing: Press the Enter button resulting in the displaying of the first of the submenu items.

1=Forced on 2=Normal

3-38

Continue with standard operating procedures to select menu options. At the end of the options the system wilL briefly display “Command Accepted” and return to the DTE OPTIONS MENU.

ConnecT 56K DSU User Manual

Table 3-25 CD Options Commands

3 = CONFIG

Front Pa nel

1=FORCED ON &C0 CD always ON 2=NORMAL &C1 ON only when data present on

3=OFF WITH LOCD &C2 ON except 5 seconds after

AT Command

Description

loop

disconnect in switched 56 applications

Submenu 9 TR Options

The TR OPTIONS menu is used to select the ConnecT 56K DSU response to the data terminal ready (TR) lead.

Menu map

3=CONFIG/1=Local/2=DTE Opt./9=TR Options

Operation

Follow standard operating procedures. When 9=TR OPTIONS is flashing: Press the Enter button resulting in the displaying of the first of the submenu items.

1=IGNORED 2=IDLE WHEN OFF

Continue with standard operating procedures to select menu options. At the end of the options the system will briefly display “Command Accepted” and return to the active menu.

Table 3-26 TR Options Commands

Front Panel

1=IGNORE &D0 TR input ignored 2=IDLE WHEN OFF &D1 ON only when data present on

3=OFF>ON DIAL #1 &D3 Dial stored #1:

4=OFF>ON DIAL #2 &D4 Dial stored #2:

AT Command

Description

loop

TR goes OFF to ON

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3-39

Operation

Submenu A SR options

The SR Options menu is used to select the operating mode for the data set ready (SR) lead.

Menu map

3=CONFIG/1=Local/2=DTE Opt./A=SR Options

Operation

To display the SR Options submenu of 1=Local submenu of 3=CONFIG. Use the scroll buttons to display the 9=Tr Options and A=SR Options. Press the * (Shift) key to activate the alpha selections Use the letter A to activate the SR Options submenu press the Enter key to enter the SR Options submenu resulting in the displaying of the first of the SR Options submenu items .

1=Forced On 2=Off OOS ONLY

Continue with standard operating procedures to select menu options. At the end of the options the system will briefly display “Command Accepted” and return to the active menu.

3-40

Table 3-27 SR Options Commands

Front Panel

1=FORCED ON &S0 SR always ON 2=OFF OOS ONLY &S1 OFF when network out of service 3=OFF LOCD ONLY &S2 OFF 5 seconds after disconnect

4=OFF TEST ONLY &S3 OFF for test only 5=OFF TEST + OOS &S4 OFF for test or OOS 6=OFF TEST + LOCD &S5 OFF 5 seconds are di sconnect for

Submenu B seconda y rate

The Secondary Rate option is used to select the operating speed for the secondary channel if the secondary channel option was selected during setup of the NETWORK OPT.

ConnecT 56K DSU User Manual

AT Command

Description

in switched 56 applicatio ns.

test

3 = CONFIG

Menu map

3=CONFIG/1=Local/2=DTE Opt./B=Secondary Rate

Operation

To display the Secondary Rate submenu of 1=LOCAL submenu of 3=CONFIG. Use the scroll buttons to display the B=Secondary Rate press the * (Shift) key to activate the alpha selections Use the letter B to activate the Secondary Rate submenu press the Enter key to enter the Secondary Rate submenu resulting in the displaying of the first of the Secondary Rate submenu it ems .

1=Off 2=75 3=150 4=300

Continue with standard operating procedures to select menu options. At the end of the options the system will briefly display “Command Accepted” and return to the active menu.

Table 3-28 Secondary Rate Commands

3=Test options

Front Pa nel

1=OFF _Y0 No secondary channel selected 2=75 _Y1 Secondary channel rate: 75Bps 3=150 _Y2 Secondary channel rate: 150 Bps 4=300 _Y3 Secondary channel rate: 300 Bps 5=600 _Y4 Secondary channel rate: 600 Bps 6=1.2K _Y5 Secondary channel rate: 1200

7=2.4K _Y6 Secondary channel rate: 2400

AT Command

Description

Bps

The T est Options menu is used to enable or disable diffe rent te st modes as well as specify the maximum test time allowed.

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3-41

Operation

ENTER TIMOUT (0=OFF) : 00SEC

1=RDL IGNORED 2=RDL ACCEPTED

1=DISABLED 2=ENABLED

3=TEST OPTIONS

1=TEST TIME OUT

2=RDL EN/DIS

3=EIA LLB EN/DIS 4=EIA RLB EN/DIS

Menu map

3=CONFIG/1=Local/3=Test Options

Operation

Follow standard operating procedures. When 3=TEST OPTIONS is flashing: Press the Enter button resulting in the displaying of the first of the Test Option submenu items. Continue with standard operating procedures to select menu options. At the end of the options the system will briefly display “Command Accepted” and return to the active menu.

3-42

Submenu 1 test timeout

The Test Timeout option is used to specify the length of time a ConnecT 56K DSU remains in a test mode before an automatic return to the data mode. The LCD displays:

ENTER TIMEOUT (0=OFF): 00SEC

Enter the time out in two digit decimal value.

Submenu 2 RDL select

The RDL Select option is used to specify whether or not the ConnecT 56K DSU responds to a remote digital loopback (RDL) request from the far end of the circuit.

ConnecT 56K DSU User Manual

Table 3-29 RDL Select Commands

3 = CONFIG

Front Panel

AT Command

Description

1=RDL IGNORED &T5 RDL request from remote DSU

ignored

2=RDL ACCEPTED &T4 RDL request accepted

Submenu 3 EIA LLB select

The EIA LLB Select option is used to specify whether or not the ConnecT 56K DSU responds to the local loopback (LLB) input from the DTE.

Table 3-30 EIA LLB Select Commands

Front Panel

AT Command

Description

1=DISABLED _R0 EIA LLB disabled 2=ENABLED _R1 EIA LLB enabled

Submenu 4 EIA RLB select

The EIA RLB Select option is used to specify whether or not the ConnecT 56K DSU responds to the remote loopback (RLB) input from the DTE.

4 = Dial options

Table 3-31 EIA RLB Select Commands

Front Pa nel

AT Command

Description

1=DISABLED _R0 EIA RLB disabled 2=ENABLED _R1 EIA RLB enabled

The Dial Option menu is used to store up to ten phone numbers and define Answer operation of the ConnecT 56K DSU when it is configured for Switched 56 operation.

4=DIAL OPTIONS

1=PHONE NUMBER

2=AUTO ANSWER

STORED NUMBER TO EDIT: (1-10) 1

1=DISABLED 2=ENABLED

ConnecT 56K DS User Manual

NNNNNNN

3-43

Operation

Menu map

3=CONFIG/1=Local/4=Dial Options

Operation

Follow standard operating procedures. When 4=Dial Options is flashing: Press the Enter button resulting in the displaying of the first of the Dial Option submenu items.

Continue with standard operating procedures to select menu options. At the end of the options the system will briefly display “Command Accepted” and return to the active menu.

Submenu 1 phone number

The ConnecT 56K DSU has storage for ten (10) numbers of 36 digits each. If a phone number is to be edited, the entire number must be reentered. This process over writes the previously stored number.

STORE NUMBER TO EDIT (1-10): X

3-44

Operation

Use the number key to type the number to be edited press Enter resulting in the number being displayed for editing. Typing numbers will begin a new entry from left to right.

Submenu 2 auto answer

The Auto Answer option is used to specify whether incoming calls are to be automatically answered by the ConnecT 56K DSU or manually by the user.

Table 3-32 Auto Answer Commands

Front Pa nel

1=DISABLED _J0 Auto Answer disabled 2=ENABLED _J1 Auto Answer enabled

ConnecT 56K DSU User Manual

AT Command

Description

5 = Manual command

3 = CONFIG

The Manual Command option is a short cut method for entering configuration and control commands for the ConnecT 56K DSU.

Operation

The first display prompts the user to enter the command number.

COMMAND:00

Use the number keys to enter the hexadecimal command number press the Enter key resulting in the command number being entered. The display shows both the command number and the present value or setting for the command. The command value can be edited or re-issued with the exiting value.

COMMAND: XX VALUE: 00

Use the number ke ys to enter t he he x adecimal v alue press the Enter key to complete resulting in the system briefly displaying “Command Accepted” and returning to the active menu.

Use the Manual Command option to access the configuration profiles listed in Table A-3, “Configuration Prof iles,” on page A-6. The command values are:

T able 3-33 Manual Command Values for Profiles

Command Profile

Command 8A Value 00

Command 8A Value 01

Command 8A Value 02

Command 8A Value 03

ConnecT 56K DS User Manual

3-45

Operation

3-46

ConnecT 56K DSU User Manual

Appendix

A Reference

This appendix provides information about warranty and customer service, what information is required by the telephone company, and AT commands. It also provides a table of configuration profiles you can load manually and many of the reference figures that are referred to in this manual.

W arra n ty and custo mer service

This unit contains no user serviceable parts. If it does not meet its published specifications or fails while in service, Verilink will replace or repair this product withi n five (5) years from the date of sh ipment. For detailed warranty, repair and return information refer to the Verilink Equipment Warranty and Repair and Return Policy Procedure.

Return Material Authorization (RMA) is required prior to returning equipment to Verilink. For Service, RMA requests, or more information, contact:

Veri link Custo mer Service:

145 Baytech Drive San Jose CA 95134

(408) 945-1199

Repair and Return Address:

145 Baytech Drive San Jose CA 95134

ConnecT 56K DSU User Manual A-1

Telephone company information

The following information may be required when applying to your local telephone company for leased line facilities.

Table A-1 Telephone company information

Service T ype

2.4 kbps Digital Interface 04DU5-24 6.0F RJ48S

4.8kbps Digital Interface 04DU5-48 6.0F RJ48S

9.6 kbps Digital Interface 04DU5-96 6.0F RJ48S 56 kbps Digital Interface 04DU5-56 6.0F RJ48S

Digital Facility Interface Code

Service Order Code

Network Jack

A-2 ConnecT 56K DSU User Manu al

AT commands

The following table lists the AT commands supported by the ConnecT 56K DSU.

T able A-2 AT Commands

AT Commands

Command Title Default

A/ Re-execute command none ATA Answer none ATDn Dial number none ATE Echo command 1 ATH Hang up call none ATO Go online none ATQn Result code display 0 ATSn? Read S register none ATSN=x Write to register none ATVn Result code form 1 ATZ Reset none AT&Cn DCD option 0 AT&Dn DTR option 0 AT&Fn Restore factory options none AT&Kn Flow control none AT&Ln Network type 0 AT&Qn D TE data format 0 AT&Rn CS options 0 AT&Sn SR options 0 AT&Tn Test commands 0

ConnecT 56K DSU User Manual

A-3

AT Commands

Command Title Default

AT&V View current configuration none AT&Wn Store user profile 0 AT&Xn Transmit clock 0 AT&Yn Power up user profile 0 AT&Zn=x Store phone number none AT\Tn Inactivity timer none AT%Bn Loop rate selected 0 AT%Kn DTE rate selected none AT%P Password control 0 AT%P=x Password entry 0 AT%P>x Password verify 0 AT%Rx Initiate remote configuration 0 AT%Tn Anti-stream option 0

A-4 ConnecT 56K DSU User Manu al

AT_An LLB control 0 AT_Cn SR control during test 0 AT_Dn RTS-CTS dela 0 AT_Fn Scrambler control 0 AT_Jn Auto answer enable/disable 0 AT_N=xx Set network address none AT_Pn Front panel enable/disable 0 AT_RR LB enable/disable 0 AT_S=xx Set serial number none

AT commands

AT Commands

Command Title Default

AT_Tn Select test pattern 0 AT_Xn Clock source select 0 AT_Yn Secondary channel rate select 0

ConnecT 56K DSU User Manual

A-5

Configuration profiles

The following table lists the configuration p rofiles you can load using the Manual Command option.

Table A-3 Configuration Profiles

Escape characte r +(2BH) + + + CR character CR(ODH) CR CR CR LF character LF(OAH) LF LF LF BS character BS(08) BS BS BS Escape guard time 50 50 50 50 Command echo DIS DIS DIS DIS Result code EN EN EN EN Long or short code LONG LONG LONG LONG

Defaults for ConnecT 56K DSU

Profile Numbers

123 4

Test pattern type 2047 2047 2047 2047 EIA controlled ALB DIS DIS DIS DIS EIA controlled RLB DIS DIS DIS DIS DTE TYPE V.35 RS232 V.35 V.35 Front panel enable/disable EN EN EN EN Test timeout OFF OFF OFF OFF DTE Command Set DIS DIS DIS DIS CS option RS RS RS RS SR test option OFF OFF OFF OFF TR option IGNORE IGNORE IGNORE IGNORE DTR recog. delay(X100ms) 3 3 3 3

A-6 ConnecT 56K DSU User Manu al

Defaults for ConnecT 56K DSU

Profile Numbers

123 4

Configuration profiles

DTR command timeout

30 30 30 30

(X100) CD option NRML NRML NRML NRML SR option NRML NRML NRML NRML RDL enable disable EN EN EN EN DTE rate (56K loop) 56K 57.6K 56K 56K RS-CTS dela SHRT SHRT SHRT SHRT DTE data format SYNC ASYNC SYNC SYNC TC timing source INT INT INT INT TX loop timin g LOOP LOOP LOOP LOOP Anti-stream time OFF OFF OFF OFF Inactivity timer OFF OFF OFF OFF

ConnecT 56K DSU User Manual

A-7

Figures

This section lists the figures referred to throughout the manual.

Figure A-1 DTE and Loop Test Diagram

DTE TD

DTE RD

DTE Transmit

Interface

DTE Receive

Interface

DTE and Loop

Loop Transmit

Interface

Loop Receive

Interface

Loop TX

Loop RX

A-8 ConnecT 56K DSU User Manu al

Figure A-2 Loop Only Test Diagram

Figures

DTE Transmit

DTE TD

DTE RD

Interface

DTE Receive

Interface

Figure A-3 DTE Only Test Diagram

DTE Transmit

DTE TD

Interface

Loop Only

Loop Transmit

Interface

Loop Receive

Interface

Loop Transmit

Interface

Loop TX

Loop RX

Loop TX

DTE RD

DTE Receive

Interface

DTE Only

Loop Receive

Interface

ConnecT 56K DSU User Manual

Loop RX

A-9

Figure A-4 DTE With Test Pattern Diagram

DTE TD

DTE RD

Error Inject

DTE Transmit

Interface

DTE Receive

Interface

Error Clear

Test Pattern

Generator

Test Pattern

Detector

Figure A-5 Test Pattern Only Diagram

Error Inject

Test Pattern

Generator

DTE with Test Patter

Loop Transmit

Interface

Loop Receive

Interface

Loop TX

Loop RX

DTE Transmit

DTE TD

DTE RD

Interface

DTE Receive

Interface

Error Clear

A-10 ConnecT 56K DSU User Manual

Test Pattern

Detector

Test Pattern Only

Loop Transmit

Interface

Loop Receive

Interface

Loop TX

Loop RX

Figure A-6 DSU to Modem Interconnect Diagram

ETC

O D

For multi-drop requirement:

DCD

ETC

RTS

Figures

C o n n

e c

5 6

K D

S U

RTS

Figure A-7 EIA 232 Connector for 56 KB/s and 64 KB/s Application

DTE

At DTE Interface RS 232 connector, tie transmit clock lead (SCT) to external transmit clock (ETC) as shown. This may resolve data error problems caused by signal delays at high rates.

DTE

(No connection)

Pin 15

Pin 24

RS 232 Connector

SCT

ETC

ConnecT 56K DSU

DCD

ConnecT 56K DSU

Options for EXT TX CLK

ConnecT 56K DSU User Manual

A-11

A-12 ConnecT 56K DSU User Manual

Verilink ConnecT 56K DSU User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Table of Contents

1 Introduction

Unit Overview

ConnecT 56K DSU rear panel

DDS Overview

Switched 56 overview

2 Installation

Unpack, inspect, power up

What Ve rilink shipments include

What the customer provides

Power up

Connecting the cables

Network interface connection

DTE data connection

Secondary channel connection

Configuration

Configuration methods

Front panel

“AT” commands

V.25 bis commands

Switched 56 operation

Remote commands

3 Operation

Understanding the keypad

Manual operation and button functions

Examples

Menu structure

The four opening menu functions

General operations and menus

General operation method

Menu map

1 = STATUS

Submenu items

2 = TEST

1=Local Unit

2=Remote unit

Operation

3 = CONFIG

1=Network Options

2 = DTE options

3=Test options

4 = Dial options

5 = Manual command

A Reference

W arra n ty and custo mer service

Telephone company information

AT commands

Configuration profiles

Figures