Black Box Multiserver 500, MX400A, MX404C, MX401C, MX406C User Manual

...

Order toll-free in the U.S.: Call 877-877-BBOX (outside U.S. call 724-746-5500) FREE technical support 24 hours a day, 7 days a week: Call 724-746-5500 or fax 724-746-0746 Mailing address: Black Box Corporation, 1000 Park Drive, Lawrence, PA 15055-1018 Web site: www.blackbox.com • E-mail: info@blackbox.com

CUSTOMER

SUPPORT

INFORMATION

MARCH 1996 MX400A MX404C MX401C MX406C MX402C MX407C MX403C MX410C

Multiserver 500

RD LS

EXE

MULTISERVER 500

FCC AND IC RFI STATEMENTS

FEDERAL COMMUNICATIONS COMMISSION

AND

CANADIAN DEPARTMENT OF COMMUNICATIONS

RADIO FREQUENCY INTERFERENCE STATEMENTS

This equipment generates, uses, and can radiate radio frequency energy and if not installed and used properly, that is, in strict accordance with the manufacturer’s instructions, may cause interference to radio communication. It has been tested and found to comply with the limits for a Class A computing device in accordance with the specifications in Subpart J of Part 15 of FCC rules, which are designed to provide reasonable protection against such interference when the equipment is operated in a commercial environment. Operation of this equipment in a residential area is likely to cause interference, in which case the user at his own expense will be required to take whatever measures may be necessary to correct the interference.

Changes or modifications not expressly approved by the party responsible for compliance could void the

user’s authority to operate the equipment.

This digital apparatus does not exceed the Class A limits for radio noise emission from digital apparatus set out in the

Radio Interference Regulation of the Canadian Department of Communications.

Le présent appareil numérique n’émet pas de bruits radioélectriques dépassant les limites applicables aux appareils numériques de la classe A prescrites dans le Règlement sur le brouillage radioélectrique publié par le ministère des Communications du Canada.

MULTISERVER 500

Trademarks

AT&T®is a registered trademark of American Telephone and Telegraph Company.

is a registered trademark of Underwriters Laboratories Incorporated.

CONTENTS

Chapter 1: Specifications.......................................................................................................................................7

Chapter 2: Introduction .......................................................................................................................................10

2.1 Multiplexing and the Multiserver 500........................................................................................................10

2.2 Description of the Multiserver 500.............................................................................................................10

2.3 Block Diagram .............................................................................................................................................12

2.3.1 Voice/Fax Interface Module.........................................................................................................13

2.3.2 Digital Processing Module.............................................................................................................13

2.3.3 Serial Interface Module.................................................................................................................13

2.3.4 LCD ................................................................................................................................................13

2.3.5 Power Supply..................................................................................................................................13

2.4 Interfaces......................................................................................................................................................13

2.4.1 Data Channel .................................................................................................................................13

2.4.2 Voice/Fax Channel........................................................................................................................13

2.4.3 Composite Channel .......................................................................................................................13

2.4.4 Command Port...............................................................................................................................13

2.5 Options14

2.6 Modules Covered in This Manual ..............................................................................................................14

Chapter 3: Installation.........................................................................................................................................15

3.1 Unpacking the Multiserver 500 ..................................................................................................................15

3.2 Installing the Multiserver ............................................................................................................................16

3.2.1 Selecting an Installation Site.........................................................................................................16

3.2.2 Cable and Power Connections ......................................................................................................16

3.3 Setting the Composite Transmit Clock ......................................................................................................17

3.4 Installing the Voice/Fax Interface Module ...............................................................................................18

3.5 Setting the Time and Date..........................................................................................................................19

Chapter 4: Using the LCD and Keypad..............................................................................................................21

Chapter 5: Using the Command Port.................................................................................................................28

5.1 Factory Defaults ...........................................................................................................................................28

5.2 Connecting Asynchronous Terminals ........................................................................................................30

5.2.1 Conecting a Single Multiserver 500 ..............................................................................................30

5.2.2 Connecting Multiple Multiserver 500s .........................................................................................31

5.3 Impedance Strapping..................................................................................................................................32

5.4 CMD IN and CMD OUT Connectors.........................................................................................................33

5.5 Accessing the Command Port.....................................................................................................................34

Chapter 6: Operation ..........................................................................................................................................41

6.1 LED Indicators.............................................................................................................................................41

6.2 The LCD and the Keypad ...........................................................................................................................43

6.3 Default Configuration Settings...................................................................................................................43

Contents

MULTISERVER 500

6.4 Operating the Multiserver 500 ...................................................................................................................44

6.4.1 Establish a Data Connection .........................................................................................................44

6.4.2 To Make a Telephone Call.............................................................................................................44

6.4.3 To Send a Fax Message ..................................................................................................................47

Chapter 7: Diagnostics and Troubleshooting ....................................................................................................48

7.1 Automatic Self-Test......................................................................................................................................48

7.2 User-Initiated Tests ......................................................................................................................................48

7.2.1 Suggested Test Sequence...............................................................................................................50

7.2.2 EEPROM Test.................................................................................................................................50

7.2.3 Self-Test...........................................................................................................................................50

7.2.4 Local Data Loopback Test .............................................................................................................50

7.2.5 Local Composite Loopback Test...................................................................................................51

7.2.6 Remote Composite Loopback Test...............................................................................................54

7.2.7 Remote Data Loopback .................................................................................................................57

Appendix A: FXS Voice/Fax Interface Module.................................................................................................58

A.1 Connectors on the Back Panel ...................................................................................................................59

A.2 Strapping......................................................................................................................................................61

A.3 Removing or Replacing the Module ..........................................................................................................61

A.4 Specifications ...............................................................................................................................................61

Appendix B: FXO Voice/Fax Interface Module................................................................................................63

B.1 Connectors on the Back Panel ...................................................................................................................64

B.2 Strapping......................................................................................................................................................66

B.3 Removing or Replacing the Module ..........................................................................................................67

B.4 Specifications ...............................................................................................................................................67

Appendix C: E&M Voice/Fax Interface Module...............................................................................................68

C.1 Differences Between Models.......................................................................................................................68

C.2 Telephone-Interface Connectors................................................................................................................69

C.3 Connecting the Telephone-Interface Cable ..............................................................................................69

C.4 E&M Lead States..........................................................................................................................................71

C.5 Connection Diagrams..................................................................................................................................71

C.6 Strapping......................................................................................................................................................75

C.7 Removing or Replacing the Module ..........................................................................................................76

C.8 Specifications ...............................................................................................................................................76

Appendix D: Changing the Data Interface Types..............................................................................................77

D.1 Removing the Top Cover ............................................................................................................................78

D.2 Configuring the Interfaces..........................................................................................................................78

D.3 Replacing the Top Cover.............................................................................................................................80

Appendix E: Agency and Telephone-Company Requirements ........................................................................82

E.1 Requirements for Operation with the Telephone Company....................................................................82

E.2 Equipment Attachment Limitations for Operation in Canada ................................................................82

Appendix F: Cabling and Pin Assignments........................................................................................................84

F.1 Cables for the Composite Interface ...........................................................................................................84

F.2 Data-Channel Interface Cables...................................................................................................................92

CONTENTS

Glossary .................................................................................................................................................................97

Index....................................................................................................................................................................102

Figures

2-1 Typical Multiserver 500 Application...........................................................................................................10

2-2 Multiserver 500, Front and Rear Views ......................................................................................................11

2-3 Multiserver 500 Block Diagram ..................................................................................................................12

3-1 Cable and Power Connectors......................................................................................................................16

3-2 Clocking with Multiserver 500 Connected to a DCE Device ....................................................................17

3-3 Installing or Removing the Voice/Fax Interface Module.........................................................................18

3-4 Setting the Time and Date..........................................................................................................................20

5-1 Reconfiguring the Command-Port Parameters .........................................................................................29

5-2 Connecting the Asynchronous Terminal ...................................................................................................30

5-3 Typical Three-Multiserver Daisychain Topology........................................................................................31

5-4 Setting the Data Rate and Device Number ................................................................................................31

5-5 Location of Command Port Impedance Header E5-on the Serial Interface Module ............................32

5-6 CMD IN CMD OUT Connector Pin Assignments (RS-422 Interface).....................................................33

5-7 Flowchart for Accessing the Command Port .............................................................................................34

6-1 The Front Panel of the Multiserver 500 .....................................................................................................41

6-2 Telephone Calls from Local FXS Interfaces ..............................................................................................45

6-3 Telephone Calls from Local FXO or E&M Interfaces...............................................................................46

7-1 Clocking, with Multiserver 500s Connected in a Back-to-Back Hookup..................................................48

7-2 Tests in the Diagnostics Menu ....................................................................................................................49

7-3 Local Data Loopback Test...........................................................................................................................51

7-4 Local Composite Loopback Test.................................................................................................................52

7-5 FXO and E&M Voice/Fax Connections.....................................................................................................52

7-6 Setting Up a Remote Composite Loopback Test.......................................................................................55

7-7 Setting Up a Remote Data Loopback Test .................................................................................................56

A-1 A Typical FXS Application ..........................................................................................................................58

A-2 Connectors on the Back Panel of the FXS Interface Module ..................................................................59

A-3 Wiring of the Connectors on the Back Panel ............................................................................................59

A-4 Cable Connections ......................................................................................................................................60

B-1 A Typical FXO Application .........................................................................................................................63

B-2 Back Panel of the FXO Analog Interface Module.....................................................................................64

B-3 Wiring of the Connectors on the Back Panel ............................................................................................64

B-4 Cable Connections ......................................................................................................................................65

B-5 Locations of the Straps on the FXO Interface Module.............................................................................66

C-1 Connections for the E&M Voice/Fax Interface Module ..........................................................................68

C-2 Connectors on the Back Panel ...................................................................................................................69

C-3 Connecting the E&M Cable........................................................................................................................70

C-4 Type I Interface Connection.......................................................................................................................72

C-5 E&M Type II Interface Connection............................................................................................................73

C-6 E&M Type V Interface Connection Diagram.............................................................................................74

C-7 Where the Straps Are on the E&M Module...............................................................................................75

D-1 Removing the Top Cover ............................................................................................................................77

D-2 Configuring the Composite Interface........................................................................................................79

D-3 Configuring the Data-Channel Interface...................................................................................................81

F-1 Pin Assignments for the RS-232 COMPOSITE and DATA CHANNEL Connectors ...............................84

MULTISERVER 500

F-2 RS-232-to-RS-232 DCE Crossover Cable (EZ423-0015) .............................................................................85

F-3 Pin Assignments for the V.35 COMPOSITE and DATA CHANNEL Connectors....................................86

F-4 V.35-to-DCE Crossover Cable (EHN070-005M).........................................................................................87

F-5 Pin Assignments for the RS-530 COMPOSITE and DATA CHANNEL Connectors ...............................88

F-6 RS-530-to-RS-530 DCE Crossover Cable .....................................................................................................89

F-7 RS-530-to-RS-449 DCE Crossover Cable .....................................................................................................90

F-8 RS-530-to-X.21 DCE Crossover Cable.........................................................................................................91

F-9 RS-232-to-DTE Straight Cable (EDN16C-xxxx-MF) ..................................................................................92

F-10 V.35-to-DTE Straight Cable (EHN071-005M) ............................................................................................93

F-11 RS-530-to-RS-530 DTE Straight Cable ........................................................................................................94

F-12 RS-530-to-RS-449 DTE Straight Cable ........................................................................................................95

F-13 RS-530-to-X.21 DTE Straight Cable ............................................................................................................96

Tables

1-1 Allowable Rate Combinations.......................................................................................................................8

5-1 Impedance-Strapping Requirements .........................................................................................................32

6-1 LED Indicators.............................................................................................................................................42

C-1 E&M Lead States..........................................................................................................................................71

D-1 List of Configuration Items for the Composite Interface.........................................................................78

D-2 List of Configuration Items for the Data Channel Interface....................................................................80

CHAPTER 1: Specifications

Composite Interface

Type — RS-232 (CCITT V.24/V.28) serial

synchronous, internal/external clocking; fullduplex interfaces to support optional V.35, RS-530, RS-449, and X.21 standards

Connector — DB25 female

Configured as — DCE

Speeds (bps) — 7200, 9600, 14,400, 19,200,

38,400, 56,000, 64,000, 72,000

NOTE: The Multiserver 500 will not operate with

clock rates, internal or external, other than those specified above.

Data-Channel Interface

Number of Channels — 1

Type — RS-232 (CCITT V.24/V.28) serial

synchronous/asynchronous, full-duplex interfaces to support optional V.35, RS-530, RS449 and X.21 standards.

Connector — DB25 female connector

Configured as — DCE

Sync Channel Data Rates — 1200 bps to

72,000 bps

Sync-Channel Bandwidth Allocation — Fixed rate

or dynamic rate

Fixed Rate: Always operates at guaranteed rate

Dynamic Rate: Operates at either a maximum

configured rate or guaranteed configured rate, depending on voice/fax activity and DBA configuration

Dynamic Rate

Switching Status — On-hook/off-hook, or

idle/active voice/fax traffic

Maximum Rate — Composite rate minus

overhead

Async Channel

Data Rates — 1200 bps to 57,600 bps

Data Bits — 7 or 8 data bits plus 1 parity bit

Parity — Space, mark, even, odd, none

Stop Bits — 1, 1.5, and 2 per character

Flow Control — RTS/CTS and X-ON/X-OFF;

must be configured the same way at each end

EIA Controls: — 4 full-duplex control signals

supported

Voice/Fax Channel

Interface Types — E&M, FXS, or FXO, depending

on the type of voice/fax interface card installed

Digitizing Rates — Fixed rates of 4000, 4800,

6400, 7200, 8000, 9600, 12,000, 12,800, 14,400, and 16,000. The voice/fax channel is automatically assigned the highest fixed rate within the available bandwidth. Available bandwidth equals composite rate minus guaranteed sync channel rate minus overhead. Overhead is 400 bps for composite rates of less than 56 Kbps, and 800 bps for composite rates of 56 Kbps and above.

Specifications for Voice/Fax Modules — See

Appendixes A, B, and C

Command Port Interface

Type — RS-232 (CCITT V.24/V.28) serial

asynchronous

Connector — 8-position modular jack wired as RJ-

1D DCE

Speeds — 1200 bps to 19,200 bps

Data Bits — 7 or 8 data bits plus 1 parity bit

Parity — Space, mark, even, odd, none

1. Specifications

MULTISERVER 500

Stop Bits — 1, 1.5, and 2 per character

Flow Control — X-ON/X-OFF

Allowable Rate Combinations

Table 1-1 shows the allowable combinations of composite and data channel rates.

Table 1-1. Allowable Rate Combinations

Composite Sync Data DBA Max Maximum

Rate Rate Sync Rate Async Rate

---------------------------------------------------------------------------7200 1200 6800 3600

2400 6800 3600 6800

---------------------------------------------------------------------------9600 1200 9200 4800

2400 9200 3600 9200 4800 9200

----------------------------------------------------------------------------

14400 1200 14400 9600

2400 14000 3600 14000 4800 14000 7200 14000 9600 14000

----------------------------------------------------------------------------

19200 1200 14000 14000

2400 14000 3600 19200 4800 19200 7200 19200

9600 19200 12000 19200 14400 19200

Composite Sync Data DBA Max Maximum

Rate Rate Sync Rate Async Rate

---------------------------------------------------------------------------38400 1200 14400 28800

2400 14400 3600 19200 4800 19200 7200 19200

9600 19200 12000 28800 14400 28800 19200 33600 28800 38000 33600 38000

---------------------------------------------------------------------------56000 1200 14400 38400

2400 14400 3600 19200 4800 19200 7200 19200

9600 19200 12000 28800 14400 28800 19200 33600 28800 38400 33600 48000 38400 55200 46400 55200 48000 55200 51200 55200

CHAPTER 1: Specifications

Composite Sync Data DBA Max Maximum

Rate Rate Sync Rate Async Rate

---------------------------------------------------------------------------64000 1200 14400 38400

2400 14400 3600 19200 4800 19200 7200 19200

9600 19200 12000 28800 14400 28800 19200 33600 28800 38400 33600 48000 38400 56000 46400 56000 48000 63200 51200 63200 56000 63200 57600 63200

---------------------------------------------------------------------------72000 1200 14400 38400

2400 14400 with 8-bit data 3600 19200 4800 19200 7200 19200

9600 19200 57600 12000 28800 with 7-bit data 14400 28800 19200 33600 28800 38400 33600 48000 38400 56000 46400 56000 48000 64000 51200 64000 56000 71200 57600 71200 64000 71200

Indicators — Self-test, EEPROM test, local and

remote data loopback tests, and local and remote composite loopback tests

Power Requirements — 100-250 VAC, @ 0.9A, 50-

60Hz

Power Supply — External, provided with the

Multiserver

Size — 11.25″L × 8.5″W × 3″H (29 × 22 × 8 cm)

Weight — 3.4 lb. (1.5 kg)

Operating Environment —

Temperature: 32 to 114° F (0 to 45.5° C) operating; -40 to 158° F (-40 to 70° C) storage

Relative Humidity: 25% to 75%

Atmospheric Pressure: 12.47 to 15.37 psi (86 KPA

to 106 KPA)

Agency Compliance

FCC Part 15, Class A

FCC Part 68

C.R.C., C. 13744

VDE 0871 Level B

CSA Standard C.22.2 No. 950 M-89

UL 1950

BABT 340, Issue 6

TÜV/GS-EN 60950/VDE 0805

DOC CS-03

MULTISERVER 500

2.1 Multiplexing and the Multiserver 500

The Multiserver 500 is a standalone voice/fax/data multiplexor. It converts analog voice into low-bitrate digital format, and multiplexes the digitized voice with data into a composite digital stream. The composite stream is transmitted over a leased line to a remote site.

At the remote site, another Multiserver 500 demultiplexes the composite stream into data and digitized voice, and reconverts the digitized voice into analog form.

It’s the low bit rates that allow voice signals to share a leased line with data. When you add digitized voice to an already existing data link, you don’t pay anything more than your existing leasing costs; the voice gets a free ride.

In addition to accepting analog voice signals for digital conversion, the Multiserver 500 can also process analog signals from a fax machine. When the mux detects fax signals, the firmware switches into fax mode. In this mode, signals are demodulated into fax symbols and passed as data to

the remote end. At the remote end the symbols are remodulated to the correct standards.

A typical Multiserver 500 application is shown in

Figure 2-1.

2.2 Description of the Multiserver 500

Physically, the Multiserver 500 is an assembly of printed circuit boards—one data channel/composite channel and one voice/fax module—housed in a rectangular enclosure (see Figure 2-2). The front of the unit includes an LED display, an LCD display, and a keypad.

The LED display monitors power status, self-test results, link conditions, and voice and data channel activities.

The LCD display provides status, events, and messages, and together with the keypad is used for configuration, diagnostics, and administration functions.

The physical ports for connecting the Multiserver 500 to the various interfaces are on the back of the unit.

2. Introduction

Figure 2-1. Typical Multiserver 500 Application.

PBX

MAINFRAME

LOCAL

MULTISERVER 500

COMPOSITE

LINK

REMOTE

MULTISERVER 500

VOICE

CHAPTER 2: Introduction

Figure 2-2. Multiserver 500, Front and Rear Views.

LCD DISPLAY

KEYPAD

FRONT VIEW

REAR VIEW

LED INDICATORS

PO IS TD RD LS RS VA TM

MULTISERVER 500

DC POWER CMD

PORT-IN

EXE

CMD

PORT-OUT COMPOSITE DATA CHANNEL

FXS

SG R T

FXS

MULTISERVER 500

2.3 Block Diagram

Figure 2-3 is a diagram of the basic building blocks that make up the Multiserver 500: the digital processing module, the voice/fax interface module,

and the serial interface module. Attached to the basic building blocks are the LCD display and power-supply unit.

Figure 2-3. Multiserver 500 Block Diagram.

VOICE/FAX

INTERFACE MODULE DIGITAL PROCESSING MODULE

VOICE/FAX

SERIAL INTERFACE

MODULE

LED

DATA

COMPOSITE

COMMAND PORT

POWER

SUPPLY

UNIT

KEYPAD

RIBBON

CABLE

LCD

CHAPTER 2: Introduction

2.3.1 VOICE/FAX INTERFACE MODULE

The main function of the voice/fax interface module is to convert the analog signals from the fax machine or telephone equipment into digital form, so they can be used by the digital processing module. In addition, the voice/fax interface module supplies impedance matching and signaling conversion between the analog interface and the Multiserver 500.

2.3.2 D

IGITAL PROCESSING MODULE

The digital processing module is the main processing unit of the Multiserver 500. Its functions include voice compression and multiplexing. In addition, the LCD display and the keypad form part of the digital processing module.

2.3.3 S

ERIAL INTERFACE MODULE

The serial interface module provides physical connections for the data, composite, and Command Port interfaces. It also contains the clockgenerating circuits derived either from internal or external sources.

2.3.4 LCD

With the keypad, the LCD lets you configure and monitor the Multiserver 500. It physically connects to the digital processing module by a ribbon cable.

2.3.5 P

OWER SUPPLY

Power is supplied from a detachable power supply through a connector at the back of the Multiserver 500.

2.4 Interfaces

There are four interfaces that connect to the Multiserver 500: data channel, voice/fax channel, Command Port, and composite ichannel nterface.

2.4.1 D

ATA CHANNEL

The data channel interface is an RS-232 interface terminated in a DB25 connector wired as DCE. Support for V.35, RS-449/RS-530, and X.21 physical levels is available on an optional basis, implemented by daughterboards that plug into the serial interface module.

The mux can accept both synchronous data

ranging from 1200 bps to 72,000 bps, and

asynchronous data ranging from 1200 bps to 57,600 bps.

2.4.2 VOICE/FAX CHANNEL

Depending on the type of telephone equipment (or other analog equipment) interfacing with the voice/fax channel, the voice/fax channel conforms with one of three common types of signaling conventions:

•FXS (Foreign Exchange Station)—Loop Start

•FXO (Foreign Exchange Office)—Loop Start

•E&M (E-lead and M-lead)—Tie Line Trunk

You can easily match the Multiserver 500 with the correct telephone interface with a set of three optional analog interface modules: FXS, FXO, and E&M.

For more detailed information on the analog

interface modules, refer to Appendixes A, B, and C.

2.4.3 C

OMPOSITE CHANNEL

The composite is a synchronous channel ranging from 7200 bps to 72,000 bps. Physically, the composite channel is an RS-232 port terminated in a DB25 connector wired as DCE. Support for V.35 RS-449/RS-530, and X.21 physical levels is also available, implemented by daughterboards that plug into the serial interface module.

2.4.4 C

OMMAND P

ORT

The Command Port is one way to access the command facility of the Multiserver 500. Use the command facility to issue commands and to monitor status.

Physically, the Command Port is a set of two RJ-45 connectors at the back panel. It’s used to connect an external asynchronous terminal to the Multiserver 500.

In a single Multiserver 500 application, the CMD PORT-IN connector is used for connection to the terminal.

When several muxes are controlled by a single terminal, the CMD PORT-IN connector connects to the previous Multiserver 500 (or terminal, if it is the first unit in line) and the CMD PORT-OUT connector connects to the next Multiserver 500 in

MULTISERVER 500

line.

2.5 Options

As described earlier, the composite port and data channel interface connectors are wired, as standard, for interfacing with RS-232 type devices. You can change the interface with a conversion kit. See the next section for the part numbers.

For additional information, refer to Appendixes D and F.

2.6 Models Covered in This Manual

The basic Multiserver 500 is part number MX400A232/232. You might also have ordered it in any of the optional configurations:

MX400A-35/35: V.35 composite interface, V.35 data interface

• Base unit (MX400A-232/232)

• Two MX410C-35 Interface Cards

MX400A-422/422: RS-422 (X.21) composite interface, RS-422 (X.21) data interface

• Base unit (MX400A-232/232)

• Two MX410C-422 Interface Cards

MX400A-422/35: RS-422 (X.21) composite interface, V.35 data interface

• Base unit (MX400A-232/232)

• MX410C-422 Interface Card

• MX410C-35 Interface Card

MX400A-35/232: V.35 composite interface, RS-232 data interface

• Base unit (MX400A-232/232)

• MX410C-35 Interface Card

MX400A-422/232: RS-422 composite interface, RS-232 data interface

• Base unit (MX400A-232/232)

• MX410C-422 Interface Card

In addition to the Multiserver 500 (MX400), this manual covers the following voice/fax interface card models:

• MX401C: Standard E&M Interface Module

• MX402C: Enhanced E&M Interface Module

• MX403C: Standard FXO Interface Card

• MX404C: Enhanced FXO Interface Module

• MX406C: Standard FXS Interface Card

• MX407C: Enhanced FXS Interface Module

CHAPTER 3: Installation

Use the following procedures as a setup guide.

3.1 Unpacking the Multiserver 500

Unpack and inspect the equipment. Report any physical damage to the shipping carrier. Save the packing material. You may need it if you need to return the unit for repair.

Check the contents of the equipment against the packing slip. Verify that you have received the following:

• The Multiserver 500

• If applicable, one modular cable for connecting your FXS or FXO interface module to telephone equipment

• One RJ-45-to-DB25 adapter

• One 8-conductor modular cable for use with the adapter

• One power supply

Appendix F contains wiring diagrams for the above cables. You may use them to construct your own interface cables. Refer to Appendixes A, B, and C for telephone interface cabling details.

3. Installation

MULTISERVER 500

3.2 Installing the Multiserver

3.2.1 SELECTING AN INSTALLATION SITE

You can place the unit on a tabletop or shelf large enough to accommodate it. Allow enough space to get to the cables easily and remove the cover, and make sure there is unobstructed air flow from the sides of the unit.

3.2.2 C

ABLE AND POWER CONNECTIONS

Figure 3-1 shows the rear panel of the Multiserver 500.

1. Composite Interface

Use a crossover cable appropriate for your installation. (See Section F.1 in Appendix F.) Connect one end to the COMPOSITE connector and the other end to the DCE device.

2. Data Channel Interface

Use a straight cable appropriate for your installation. (See Section F.2.) Connect one end to the DATA CHANNEL connector and the other end to the DTE device.

3. Telephone Interface

Requirements vary with the type of telephone equipment you’re connecting to—and with the type of voice/fax interface module installed in the Multiserver 500. Refer to Appendixes A through C for details.

4. Power Connection

Connect the power supply output directly into the DC POWER connector of the Multiserver 500. Connect the other end to an AC wall outlet.

Figure 3-1 Cable and Power Connectors.

ASYNCHRONOUS

TERMINAL

CONNECT TO

DCE DEVICE

CONNECT TO

DTE DEVICE

DC POWER CMD

PORT-IN

CMD

PORT-OUT COMPOSITE DATA CHANNEL

SG R T

FXS

CHAPTER 3: Installation

WARNING!

Do not use any power supply other than the one provided with your Multiserver 500, as illustrated in Figure 3-1. Any other power supply could damage the Multiserver 500.

5. Connecting a Terminal to the Command Port

See Chapter 6 for information on setting up and using your terminal.

3.3 Setting the Composite Transmit Clock

If your composite interface is connected to a DCE device as in Figure 3-2, verify that the composite clock is set to external. You can do that from the LCD/keypad:

Main Menu

Configure Parameter

Composite Link

External Clock

NOTE: As shown in Figure 3-2, the Multiserver 500

provides transmit and receive clocks to the synchronous data interface.

CAUTION!

Once a pair of Multiserver 500s, configured for external clocking, have established communications, the clocking rate provided from the link DCE device cannot be changed. If the DCE rate is changed you must either cycle the power off and on on the Multiserver 500 or disconnect the link cable and then reconnect.

Once you’ve selected a composite clock rate, you must set both the local and remote muxes to the same rate. The procedure is as follows (see Figure 3-3 ):

2. Set the clock rate (9600) of the local unit to external:

>COM C=EX R=9600 <cr>

Figure 3-2. Clocking with Multiserver 500 Connected to a DCE Device

DATA SOURCE MULTISERVER 500 DCE DEVICE

RxC

RxD

RxC

RxD

Set for

External

TxD

TxC

Clock

TxD

TxC

Figure 3-3. Installing or Removing the Voice/Fax Interface Module.

MULTISERVER 500

3. Save the clock rate:

>SA

4. At the remote unit, repeat steps 2 and 3.

NOTE: Both the local and the remote Multiserver

500s must be set to the same composite clock rate. Otherwise, the system will lock up.

3.4 Installing the Voice/Fax Interface Module

Normally, the Multiserver 500 is shipped with the voice/fax interface module already installed. If it was shipped separately, or if you need to change the existing module, see Figure 3-3 and proceed as follows:

Tool Required: Medium-sized flat-head screwdriver.

To install:

1. Facing the rear of the Multiserver 500, place the voice/fax interface module in the card guides, then slide it toward the rear until it is firmly seated in its mating connector in the digital module.

DC POWER CMD

PORT-IN

CMD

PORT-OUT COMPOSITE DATA CHANNEL

FXS

SG R T

VOICE/FAX

INTERFACE MODULE

SCREW (2)

FXS

CAPTIVE

CHAPTER 3: Installation

2. Secure the module with the two spring-loaded captive screws. For further information, including cable installation, refer to Appendix A, B, or C.

To remove:

1. Using a medium-sized flat-head screwdriver, unscrew the two spring-loaded captive screws.

2. Grasp the interface module firmly and slide it slowly toward you until it’s free of its mating connector, then slide it out of the Multiserver 500.

3.5 Setting the Time and Date

To set the time of day and date from the Command Port terminal, enter:

>U T=hh:mm:ss (set)

>U D=dd/mm/yy (set)

Note that time and date are not stored in EEPROM (non-volatile memory), and must be set again each time the Multiserver is powered up.

See Chapter 6 for additional Command Port

details.

To set the time of day and date from the

LCD/keypad, follow the diagram in Figure 3-4.

MULTISERVER 500

Refer to Chapter 4 for additional LCD/keypad details.

Multiserver 500

Time 00:00:00

MAIN MENU

CONFIGURE PARAM

VOICE CHANNEL

SET TIME AND DATE

SET TIME

SET DATE

DATE: 01/01/00

SET YEAR DIGITS LAST

SET MONTH DIGITS NEXT

SET DAY DIGITS FIRST

TIME: 00:00:00

Set hours digits first. Use up arrow to go forward, use the down arrow to go backward. When you’re finished, press right arrow to advance to minutes.

Set minutes digits next. Use up/down arrows. Press right arrow to advance to seconds.

Set seconds digits last. Use right arrow to return to main menu.

press down arrow

press left arrow twice

press down arrow

Figure. 3-4. Setting the Time and Date.

CHAPTER 4: Using the LCD and Keypad

One of the ways to configure and monitor the Multiserver 500 is to use the LCD/keypad. For the Command Port method, see Chapter 5.

* NLP = Non-linear processing, which suppresses residual echo. In E&M 4-wire applications, voice quality

may be improved by disabling NLP.

Parameters shown in bold are default values.

4. Using the LCD and Keypad

Main Menu

Status Diagnostics Reset Configure

Voice

Channel

Interface

Analog

Busy

State

Composite

Link

Data

Channel

Background Fax

Param

Command

Port

Factory

Default

Load From

Mode

Save

EEPROM

Set

Password

Set Time and Date

NLP Mode*

Silence

Disable EnableOn SystemOff

Regenerated Disable Enable

MULTISERVER 500

* If you operate your equipment in the U.S.A. or Canada, input gain and output attenuation levels must be set to 0 dB. In other countries, follow the standards of the country where the equipment is being used. If there are no specific standards, set the input and output levels of your equipment to match the interfacing telephone equipment.

Parameters shown in bold are default values.

Configure Param (cont.)

Analog Interface

Ringing

Frequency

Signalling

Format

DC Pulsed

AC-15

Input Gain* Output

3 2 1 0 -1 -2 -3

9 10 19 20

Operation Extra Gain

2-Wire 4-Wire None 7

-4

-5

-6

25_Hz 50_Hz

Attenuation*

Interrupted

3 2 1 0 28 27 26

Ring Type Impedance

2-4

Interrupted

Repeated

1-2

600 Ohms Complex

9 10 19 20

CHAPTER 4: Using the LCD and Keypad

NOTE: When you change these Command Port parameters, they become effective after you select a Save

and then a Reset.

* Does not include parity bit.

Parameters shown in bold are default values.

Configure Param (cont.)

Command Port

Parity Stop

Bits

1 21.5

Auto

1200

Data*

Bits

2400

4800

9600

Data Rate

19200

Flow

Control

None Xon/Xoff 0........8

Enable Disable7 8

Local Echo

Device

Number

None Even Odd Mark Space

MULTISERVER 500

* Does not include parity bit.

Parameters shown in bold are default values.

(see next page for

parameters)

Configure Param (cont.)

Data Channel

Echo Flow

None Even Odd Mark Space

Enable Disable

1200

2400

1 1.5

3600

2 7 8

4800

7200

Asynchronous Synchronous

Data RateData Bit*Stop BitsParity

Control

Xon/Xoff

None

9600

14400

19200

28800

38400

EIA

Signal

CTS/

RTS

57600

RI DSR Control DCD Control CTS Control CTS

Off

Link

Off

Status

Remote

DTR

Off

Remote

RTS

Delay

Off

Local

RTS

125 ms 150 ms100 ms75 ms50 ms25 msNone

CHAPTER 4: Using the LCD and Keypad

NOTE: The Multiserver 500 will not operate with clock rates, internal or external, other than those specified

above.

* Refer to Section 6.4.1 for a definition of Dynamic Bandwidth Allocation.

Parameters shown in bold are default values.

Configure Param (cont.)

Data Channel (cont.)

Synchronous

Rate Max

1200

(rate)

2400

3600

4800

7200

Transmit

Rate

12000

14400

9600

Internal Clock External Clock

28800

19200

Clock

Internal External

46400

33600

38400

Composite Link

48000

Off

56000

51200

Dynamic*

Bandwidth

Silence

57600

64000

Hook

72000

(maxrate)

9600

7200

14400

Clock Rate

19200

38400

56000

72000

64000

MULTISERVER 500

* Shows status of all configuration parameters, as selected.

Main Menu (cont.)

Status

self test passed self test active checksum failed ram failed eeprom passed eeprom failed

Analog

Interface

H/W Rev.

Dash No.

Configuration

Type

S/W Rev.

Dash No.

Remote Comp. Local Comp. Remote Data Local Data Comp. Loop Data Loop

DSP

Dash No.

H/W

Rev.

Serial

Board

H/W Rev.

SystemDiagnosticsCurrent*

Type

Voice

Channel

I/F

Link

Status

CompositeSelf Test Analog

Clock

Rate

Data

Channel

Out

Level

Algorithm

Verification

I/F Type

Rate

PROM

Algorithm

Ver.

PROM

I.D.

Local

On/Off

Hook

Remote

On/Off

Hook

Level

Receive

Clock

Transmit

Clock

EIA

Signal

B0=

CTS RTS DCD DTR RI DSR UNA

Flow

Control

= = = = = = =

CHAPTER 4: Using the LCD and Keypad

Main Menu (cont.)

Diagnostics

Composite

Remote

Composite

Local

Data

Remote

Data

Self

Test

TerminateLocal

EEPROM

MULTISERVER 500

In addition to performing all of the functions from the LCD/keypad, you can also do the same thing with an asynchronous terminal connected to the Command Port (with the exception of setting the device number). This section describes how to configure and strap the Command Port and how to connect the asynchronous terminal to the Command Port.

Once you’ve configured the Command Port and connected the asynchronous terminal, you can use the Command Port to configure and monitor the Multiserver 500. See Section 6.3 for default details.

5.1 Factory Defaults

The factory defaults of the Command Port are as follows:

Data Rate: Automatic Baud Rate

(ABR)

Number of Data Bits: 8

Parity: None

Number of Stop Bits: 1

Flow Control: None

Device Number: 0

Local Echo: Enabled

If your terminal meets all of the above parameters (with the exception of device number), including any of the compatible ABR rates, your Command Port is ready for operation. ABR is compatible with 1200, 2400, 4800, 9600, and 19,200 bps.

Otherwise, the Command-Port parameters must be reconfigured from the LCD/keypad, as shown in Figure 5-1.

5. Using the Command Port

CHAPTER 5: Using the Command Port

Main Menu

Figure 5-1. Reconfiguring the Command-Port Parameters.

Configure Parameter

Analog

I/F

Voice

Channel

Parity Stop Bit

121.5

Composite

Link

Data

Bits

Data

Channel

Command

Port

Data Rate

Save

Load

From

Set Time

& Date

Flow

Control

None Xon/Xoff 0........8

Enable Disable8 7

Local Echo

Set

Password

Device

Number

None Even Odd Mark Space

Auto

1200 2400 4800 9600 19200

MULTISERVER 500

5.2 Connecting Asynchronous Terminals

The Command Port includes an interface connector, so you can connect an asynchronous terminal. The interface connector also lets you control multiple Multiserver 500s from a single terminal in a daisychain fashion.

5.2.1 C

ONNECTING A

SINGLE MULTISERVER 500

As shown in Figure 5-2, there are two RJ-45-type Command Port connectors located on the rear panel of the Multiserver 500: CMD IN and CMD OUT. Cable requirements and pinouts are detailed

in Section 5.4. If your installation includes a single Multiserver 500, connect the asynchronous terminal to CMD IN. You will need an RJ-45 to DB25 adapter to connect the cable to the asynchronous terminal.

NOTE: In a single-unit installation, the device

number must be left at its default value of 0, and you must strap the Multiserver 500 for the low-impedance position. Strapping details are covered in Section 5.3.

5.2.2 C

ONNECTING MULTIPLE MULTISERVER 500S

Figure 5-2. Connecting the Asynchronous Terminal.

DC POWER CMD

PORT-IN

CMD

PORT-OUT COMPOSITE DATA CHANNEL

SG R T

FXS

CHAPTER 5: Using the Command Port

You can connect up to eight Multiserver 500s in a daisychain and control the chain from a single asynchronous terminal. Figure 5-3 shows the topology for a typical three-Multiserver 500 local installation. Before connecting them, you must configure each Multiserver 500 with a fixed data rate and then with a device number from the LCD and keypad. (See Figure 5-4.) The default values are

8 data bits, 1 stop bit, no parity, autobaud, no flow control, and local echo enabled.

At least one unit must be set to 1; each of the other units may be set randomly to any number in the range of 2 through 8, as long as no two units have the same number.

5.3 Impedance Strapping

Multiserver 500

Figure 5-3. Typical Three-Multiserver Daisychain Topology.

Figure 5-4. Setting the Data Rate and Device Number.

Unit 1

Strap

for High Impedance

Multiserver 500

Strap

for High Impedance

Multiserver 500

Strap

for Low Impedance

Main Menu

Cmd

Out

Unit 2

Cmd

Out

Unit 3

Cmd

Out

Async

Terminal

Configure Parameter

Command Port

Device Number

0.............8

Auto

Data Rate

1200 4800 9600 19200

MULTISERVER 500

You can strap the Command Port receiver for either high-impedance (30K Ω) or low-impedance (5K Ω) termination, implemented by a three-position header E5 and a 2-position jumper. Figure 5-5 shows the location E5 on the serial interface module. See Section D.1 for accessing the serial interface module.

• To strap for low-impedance termination,

position the jumper over pins 2 and 3.

• To strap for high-impedance termination, position the jumper over pins 1 and 2.

Impedance requirements are as listed in Table 5.1.

Figure 5-5. Location of Command-Port Impedance Header E5 on the Serial Interface Module.

Table 5-1. Impedance-Strapping Requirements

Number of Multiserver 500s Strapping Requirements

---------------------------------------------------------------------------------------------------------------------------------------------------------------1 Strap E5 for low impedance.

----------------------------------------------------------------------------------------------------------------------------------------------------------------

2 through 4 Strap E5 on end unit for low impedance. Strap E5 on all other

units for high impedance.

----------------------------------------------------------------------------------------------------------------------------------------------------------------

5 through 8 Strap E5 on all units for high impedance.

J9 J8

Low

3 2 1

J11 J10

E11

Impedance

High

3 2

Impedance

CHAPTER 5: Using the Command Port

5.4 CMD IN and CMD OUT Connectors

Figure 5-6 shows the pin assignments for the CMD IN and CMD OUT connectors.

Figure 5-6. CMD IN and CMD OUT Connector Pin Assignments (RS-422 Interface).

Multiserver 500

PIN 1

n/c

force to mark

n/c

Ground

Command Data Out

Command Data In

force to mark

n/c

Ground

Daisy-chain Data In

CMD Port-In

Connector

RLSD

DTR

Ground

Modular

Cable

RJ-45 to

DB25 Adapter

CTS

RTS

Terminal

To CMD Port-in of next Multiserver 500 in daisy-chain

Daisy-chain Data Out

n/c

Legend:

= Input to Multiserver 500

= Output from Multiserver 500

CMD Port-Out

Connector

Modular

Cable

MULTISERVER 500

5.5 Accessing the Command Port

To access the Command Port from the asynchronous terminal, follow the flowchart in Figure 5-7.

Figure 5-7. Flowchart for Accessing the Command Port.

Power Up

Daisy Chain

Command

Port

ABR

Enter

in quick succession

Password

Configured

Enter

<Ctrl> C

Enter Device Number

Multiserver 500 Display

Enter

Password

1 2 3

CHAPTER 5: Using the Command Port

Figure 5-7. Flowchart for Accessing the Command Port (continued).

* If daisychaining or reconfiguring Command Port, enter <Ctrl> C to end session. Otherwise, enter <exit>.

Start

Session

To Change to Remote

Command Port,

enter <Remote> command

To Return to Local

Command Port,

enter <Exit> command

Session

Completed

2 3

Either* Or*

Enter

<Ctrl> C

Enter

<Exit>

MULTISERVER 500

When you type a command, you need only type the first few unique letters. In the lists of commands in this manual, the capitalized part of a command is the minimum you must type for the Multiserver to recognize it.

Configuring the Prompt

When you first turn on the Multiserver 500, the following prompt will appear on the terminal screen: >.

You can change the prompt to whatever you like. To change it to “Multiserver 500>,” enter:

UNit PRompt = Multiserver 500 <CR>

The prompt will change to:

Multiserver 500>

The prompt thus configured becomes automatically active for the duration of the session. You can make this permanent by issuing a SAve command.

List of Commands

To get a list of commands, enter a question mark (?) followed by a <cr>.

Multiserver 500>?<cr>

The following list will appear:

Command Function

AInterface* Configures the analog interface

portion of the voice/fax parameters.

ASyncport* Configures the async data port

parameters.

CMDport* Configures the Command Port’s

parameters.

COMPositelink* Configures the composite link

parameters.

<Ctrl>C Terminates all command sessions.

DAtaport* Configures the data port type and

controls.

Command Function

DIagnostics* Performs diagnostic tests.

Exit Terminates the current command

session.

LOAd Sets parameters to factory-default

values or last saved configuration values.

Remote Accesses remote Command Port.

SAve Command to save modified

configuration in EEPROM (nonvolatile memory), replacing the default parameters. Command will take effect after unit is reset.

SHow* Displays selected information such

as status and statistics.

SYncport* Configures parameters for the sync

data port.

Unit* Changes system-level parameters.

Voiceport* Configures the digital portion of the

voice/fax parameters.

How to Enter Commands and Set Parameters

There are no menus when you use the command port. Instead, you enter a command or a string of commands that are specific to the parameter (or parameters) you intend to set or change, bypassing all intermediate steps.

• Commands are not case-sensitive.

• The upper-case letters shown in the list of commands are for your information only. They indicate the minimum number of characters required to execute that command.

• Commands that require parameters are followed by an asterisk (*). For more information about a specific command’s parameters, type the command name, followed by a space, followed by a ?.

Example: >DA ? (Data port).

• A command without an asterisk will not display

* For these commands, you must enter parameters. To get a display of parameters available under each

command, type in the command name, followed by a space, followed by a question mark (?), followed by <cr>. For example, to get the sync port parameters, type SY ?<cr>.

CHAPTER 5: Using the Command Port

more information, but will be executed when entered.

• Parameters of the same command may be chained together as a single entry, with each parameter separated by a space. The chain cannot exceed 80 characters, including spaces.

Example: to configure CTS and DSR in the data port async channel, you could enter the following string: data=as cts=on dsr=on. (NOTE: The equal sign = may be replaced by a space.)

List of Parameters

Following is a list of parameters associated with each of the commands marked with an asterisk in the list of commands.

AInterface

INput_gain (dB) -6 through 22

Output_Attn (dB) 0 through 28

OPeration (E&M) 2_wire, 4_wire

Signalling_format (E&M) DC, AC-15, Pulsed_DC

IMpedance 600 ohms, Complex

RINGTYPE (FXS) 2-4_interrupted,

1-2_interrupted

RINGFreq (FXS) 25_Hz, 50_Hz

Extra_gain (E&M 4-wire) None, 7 dB

Example: >AI IN=-6 OUT=4 RING T=2-4 IMp=600<cr> will set the FXS input gain to -6 dB, the output attenuation to 4, the ringing type to 2-4, and the line impedance to 600 Ω

NOTE: If your equipment is operated in the U.S.A.

or Canada, input and output levels must be set to 0 dB. In other countries, follow the standards of the country wherein the equipment is used. If there are no specific standards, set the input and output levels of your equipment to match the interfacing telephone equipment.

Be sure to separate each command in the string by

a space.

The parameters above become effective immediately when entered, but are not stored in EEPROM (nonvolatile memory) until saved. To save the newly set parameters in EEPROM, type >SA

<cr>.

ASyncport

Rate (bps) 1200, 2400, 3600, 4800,

7200, 9600, 14400, 19200, 28800, 38400, 57600

Data_bit 8, 7

Stop 1, 1.5, 2

Parity None, Even, Odd,

Mark, Space

Flow_control None, Xon/Xoff,

CTS/RTS

Echo Disable/Enable

Example: >AS RA=7200 D=7 P=O <cr> will set the async channel rate to 7200 bps, the number of data bits 7, and parity to odd.

Be sure to separate each command in the string with a space.

To save the newly set parameters in EEPROM, type >SA <cr>.

CMD port

Rate (bps) AUTO*, 1200, 2400,

4800, 9600, 19200

Data_bit 8, 7 (Does not include

parity bit)

Stop 1, 1.5, 2

Parity None, Even, Odd,

Mark, Space

Flow_control None, Xon/Xoff

Echo Enable, Disable

* The Automatic baud rate option is available only to terminals that use an 8-bit, no parity, 1 stop bit format.

MULTISERVER 500

Device Number: 0 through 8

Example: >CMD RA=9600 will set the Command Port rate to 9600.

Be sure to separate each command in the string by a space. To save the newly set parameters in EEPROM, type >SA <cr>.

COMpositelink

Clock External, Internal

Rate (bps) 7200, 9600, 14400,

19200, 38400, 56000, 64000, 72000

Example: >COM CL=EX RA=56000 <cr>, will set the composite port clock to external, and the rate to 56,000 bps. Rate selection applies to internal clock only.

Be sure to separate each command in the string by a space. To save the newly set parameters in EEPROM, type >SA <cr>

DAtaport

Use this command to select the data port type and parameters that are common to both the synchronous and asynchronous data channels. Parameters that are unique to the synchronous and asynchronous channels are set by separate commands for each type.

Type Asynchronous,

Synchronous

CTS ON, OFF, Local

(Follows local RTS)

CTSDelay None, 25, 75, 100, 125,

150 in msec

DCD ON, OFF, Remote

(follows remote RTS)

DSR ON, OFF, Remote

(follows remote DTR)

RI ON, OFF, Link (follows

link status)

Example: >DA TY=SY RI=OFF will set the data port type to synchronous, and the ring indicator to off.

Be sure to separate each command in the string

by a space. To save the newly set parameters in EEPROM, type >SA <cr>.

DIAgnostics

SElftest Initiates a self-test

EEprom Initiates a nonvolatile

RAM check

LOCComp Initiates a local

composite loopback

REMComp Initiates a remote

composite loopback

LOCDat Initiates a local data

channel loopback

REMDat Initiates a remote data

channel loopback

TErminate Terminates test in

progress, such as selftest or loopback

Example: To initiate a remote-data-channel loopback test, type: >DI REMD <cr>.

SHow

DATE Displays today’s date

Example: >SH DATE 03/11/94

Status Displays Multiserver

500’s current general status, including selftest, loopback, and hardware type and revision.

Example: >SH S

System Status: 20 MHz DSP, 64K RAM, no download capability

Main module 001 Voice & Data

Revision Level: B

Voice/Fax Interface Module: 002

Revision Level: 03

Interface Type: Enhanced FXS, Loop start.

CHAPTER 5: Using the Command Port

Serial Module 001 Voice & Data

Revision Level: B

Serial Module Type: Standard

Self-Test passed, EEPROM passed, No active loopback

COMposite Displays the current

status of the composite link, including rate, clock, and link.

Example: >SH COMP

COMPOSITE LINK STATUS

Link Up, External Clock Rate = 19200

VOice Displays the current

status of the voice/fax channel, including rate, on-hook/off-hook, input/output levels, etc.

Example: >SH VO

Voice Channel Status

Local = on-hook, Remote = on-hook,

Level In = 0, Level Out = 0

Algorithm rate = 16000,

Algorithm ver. = 0,

Analog interface Status:

Interface Type = Enhanced FXS,

PROM version = 2A, PROM I.D. = 2196

DATA Displays the current

EIA status of the data channel, including type, rate, flow control and EIA signal status.

Example: >SH DATA

Data Channel Status:

EIA SIGNAL

Input:

UNA = OFF, B0 = OFF, RTS = OFF,

DTR = OFF

Output:

DCD = OFF, RI = OFF, CTS =ON

DSR = OFF, for Synchronous Data:

Synchronous Tx Data Rate = 56000,

Rx Data Rate = 56000 for Asynchronous Data:

Asynchronous data rate = 9600, flow control = OFF

Time Displays current time

Example: >SH T

02:59:37

VErsion Displays the current

software revision.

Example: >SH VE

Software Revision: 907-2200-0

CONfiguration Displays the current

configuration of the data channel, Command Port, composite link, voice/fax channel, and the analog interface portion of the voice/fax channel. See the explanation below.

Example: >SH CON

Data Channel configuration

Type = Asynchronous, CTS = ON, CTSDelay = None, DCD = Remote rts, DSR = Remote dtr, RI = Link status, Rate = 9600, Data_bit = 8, Stop = 1, Parity = None, Flow_control = None, Echo = Disable

Command port configuration

device number = 1, Rate = 9600, Data_bit = 8, Stop = 1, Parity = None, Flow_control = None, Echo =

MULTISERVER 500

Enable

Voice Channel configuration

BUSYstate = SYStem,

BACKground = Silence, FAX = Disable, NLP = Enable

Composite Link configuration

Clock = External, Rate = 9600

Analog Interface configuration

INput_gain(dB) = 0, Output_attn

(dB) = 0, RINGType = 2-4_interrupted,

RINGFreq = 25_Hz,

IMpedance = 600 Ohms

Unlike SHow CONfiguration, SHow DATA always displays the parameters currently stored in EEPROM (nonvolatile memory).

To activate the newly set configuration, type >U R <cr> (unit reset).

This message might appear:

Data and composite parameters effective after unit reset.

When that message appears, the data and composite parameters displayed have been recently modified but not made effective. After you use the save command and reset the unit, the modified parameters will be stored in EEPROM (nonvolatile memory) and the message above will disappear. Unlike data and composite parameters, voice and analog parameters take effect immediately when you enter them.

SYnc port

Rate* or Maxrate (bps): 1200, 2400, 3600, 4800,

7200, 9600, 12000, 14400, 19200, 28800, 33600, 38400, 46400, 48000, 51200, 56000, 57600, 64000, 72000

Tx clock Internal/External

DBA OFF, SILENCE, HOOK

Example: >SY RA=38400 MAX=56000 DBA=HOOK <cr> will set the sync channel minimum rate to 38,400 bps, maximum rate to 56,000 bps, and DBA (dynamic bandwidth allocation) will follow the on-hook/off-hook state of the voice/fax channel.

Be sure to separate each command in the string

by a space.

To save the newly set parameters in EEPROM, type >SA <cr>. To activate the newly set parameters, type: >U R <cr> (unit reset).

Unit

Available parameters are:

Date, Reset, Time, PAssword, PRompt

When you enter the parameters listed above, they take effect immediately. Date and time cannot be saved and will be lost when power is disconnected. You must save password and prompt in order for them to remain in effect after a power off/on cycle.

VOice Port

BUsy State OFF, ON, SYstem

BAckground Silence, Regenerated

Fax Disable, Enable

NLP† Disable, Enable

Example: >BUsy SY will set the busy state to system-controlled.

Be sure to separate each command in the string by a space. The above parameters become effective immediately when entered, but are not stored in EEPROM (nonvolatile memory) until saved. To save the newly set parameters in EEPROM, type >SA <cr>.

*Guaranteed rate. †NLP = Non-Linear Processing.

CHAPTER 6: Operation

This section describes how the Multiserver 500 works. Indicators are described first, followed by procedures for transmitting data, making telephone calls, and sending fax messages.

6.1 LED Indicators

LED indicators are on the front panel of the Multiserver 500, as shown in Figure 6-1. Their functions are summarized in Table 6-1.

6. Operation

Figure 6-1. The Front Panel of the Multiserver 500.

MULTISERVER 500

PO IS TD RD LS RS VA TM

EXE

KEYPAD LED INDICATORSLCD DISPLAY

MULTISERVER 500

Table 6-1. LED Indicators

Indicator State Meaning

----------------------------------------------------------------------------------------------------------------------------------------------------------------

PO (Power On) On Unit is powered up and has passed the self-test.

Off Power is off. Flashing Self-test failed.

----------------------------------------------------------------------------------------------------------------------------------------------------------------

IS (In Sync) On The local Multiserver 500 is in sync with the remote

Multiserver 500.

Off The local and remote Multiserver 500s are out of

sync.

----------------------------------------------------------------------------------------------------------------------------------------------------------------

TD (Transmit Data) Flickering Data channel is transmitting data.

Off Data channel is not transmitting.

----------------------------------------------------------------------------------------------------------------------------------------------------------------

RD (Receive Data) Flickering Data channel is receiving data.

Off Data channel is not receiving data.

----------------------------------------------------------------------------------------------------------------------------------------------------------------

LS (Local Speech) On Speech signal from local telephone interface present.

Off No local speech present.

----------------------------------------------------------------------------------------------------------------------------------------------------------------

RS (Remote Speech) On Speech signal from remote telephone interface

present.

Off No remote speech present.

----------------------------------------------------------------------------------------------------------------------------------------------------------------

VA (Voice Active) On Voice channel is active.

Off Voice channel is idle. Flashing Voice channel is busy.

----------------------------------------------------------------------------------------------------------------------------------------------------------------

TM (Test Mode) On Multiserver 500 is in test mode.

Off Multiserver 500 is not in test mode. Flashing Test failure.

CHAPTER 6: Operation

6.2 The LCD and the Keypad

The two-line LCD (Liquid-Crystal Display) shows configuration menus, diagnostic test menus and results, time of day, and system status. A keypad lets you cycle through the LCD menu and make configuration selections. Chapter 5 explains how to use the LCD and keypad.

6.3 Default Configuration Settings

When the Multiserver 500 is first turned on, the interfaces are configured with the following default values:

Analog Interface

Input Gain: 0 dB*

Output Attenuation: 0 dB*

Operation (E&M): 4-wire

Signaling Format (E&M) DC

Impedance: 600 Ohms

Ringing Type (FXS) 2-4 interrupted

Ringing Frequency (FXS): 25 Hz

Extra Gain (E&M 4-wire): None

CMDport

Rate AUTO

Data bit 8

Stop 1

Parity None

Flow control None

Echo Enable

COMpositelink

Clock External

Rate 9600

DAtaport

Type: Synchronous

CTS: ON

CTSDelay: None

DCD: ON

DSR: ON

RI: Link status

ASyncport

Rate: 1200 bps

Data bit: 8

Stop: 1

Parity: None

Flow control: None

Echo: Disable

SYncport

Rate: 1200 bps

Maxrate: 72,000 bps

Txclock Internal

DBA OFF

* If you operate your equipment in the U.S.A. or Canada, input gain and output attenuation levels must be set

to 0 dB. In other countries, follow the standards of the country where the equipment is used. If there are no specific standards, set the input and output levels of your equipment to match the interfacing telephone equipment.

MULTISERVER 500

Voiceport

BUSYstate SYStem

BACKground Silence

FAX Enable

NLP Enable

You can change the default values either from the LCD/keypad (refer to Chapter 5) or from the Command Port (refer to Chapter 6).

6.4 Operating the Multiserver 500

NOTE: If link rate is less then the configured max rate, the maxrate need not be reconfigured.

6.4.1 ESTABLISH A DATA CONNECTION

1. Connect a synchronous or asynchronous terminal, as applicable, to the DATA CHANNEL connector at the rear of the Multiserver 500. Use the appropriate straight cable as described in Section F.2 in Appendix F.

2. Make sure that the Multiserver 500 is configured to meet the requirements of the data source. If not, reconfigure from either the LCD/keypad (refer to Chapter 5) or the Command Port (refer to Chapter 6). You can check the current configuration values with a SHow CONfiguration command from the Command Port terminal, or by entering the STATUS CONFIGURATION menu from the LCD/keypad.

3. Enter data from the keypad on the data terminal.

Notes About the Data Channel

When the data channel is synchronous, you may configure it for either fixed or dynamic bandwidth allocation.

Fixed bandwidth allocation means that the channel always operates at a fixed rate as specified by the configured “rate” parameter.

In dynamic bandwidth allocation, two rate parameters are specified: “rate” and “maximum rate.” “Maximum rate” is the amount of link bandwidth allocated to the synchronous data channel when the voice channel is not in use. When the voice channel is in use, the synchronous data channel automatically drops down to the “rate” value, a guaranteed value of bandwidth allocation. Once the voice channel is no longer in use, datachannel bandwidth allocation returns to the maximum value.

There are two ways to define when the voice channel is in use: silence and hook.

When you select hook, the voice channel is considered to be in use as soon as a voice (or fax) connection is established, and will continue to be in use until both sides hang up.

When you select silence, the voice channel is considered to be in use only while voice or fax traffic is in progress, and only in the direction of the traffic. In that direction the bandwidth of the synchronous data channel will drop from the “maximum rate” to the guaranteed “rate” speed.

6.4.2 T

O MAKE A TELEPHONE CALL

Your Multiserver 500 voice/fax channel is dedicated for operation with a compatible voice/fax channel installed at the remote Multiserver 500. Making a telephone call depends on the type of voice/fax interface module installed at each end. It may be as simple as lifting the telephone off-hook (FXS-toFXS) and waiting until the other party answers, or lifting the telephone and dialing if either end is fitted with an FXO or E&M voice/fax interface module.

Figure 6-2 shows the steps involved in making a telephone call when the Multiserver 500 at the local end is fitted with an FXS voice/fax interface module. Figure 6-3 shows the steps involved when the Multiserver 500 at the local end is fitted with either an FXO or E&M interface module.

CHAPTER 6: Operation

Figure 6-2. Telephone Calls from Local FXS Interfaces.

Lift telephone and speak when other party answers.

Lift telephone. Wait for dial tone from PBX. Dial 456, speak when other party answers.

Lift telephone. Wait for dial tone from PBX. Dial 456. Speak when other party answers.

LOCAL

MULTISERVER 500

FXS

I/F

Module

Digital

Proc

Module

FXS-TO-FXO

LOCAL

MULTISERVER 500

FXS-TO-FXS

FXS

I/F

Module

Digital

Proc

Module

Trunk

Side

REMOTE

MULTISERVER 500

Digital

Proc

Module

REMOTE

MULTISERVER 500

Digital

Proc

Module

PBX

Station

Side

FXS

I/F

Module

FXO

I/F

Module

ST 123

ST 456

FXS-TO-E&M

LOCAL

MULTISERVER 500

FXS

I/F

Module

Digital

Proc

Module

ST 456

PBX

Station

Side

REMOTE

MULTISERVER 500

Digital

Proc

Module

Trunk

Side

E&M

I/F

Module

MULTISERVER 500

Figure 6-3. Telephone Calls from Local FXO or E&M Interfaces.

Lift telephone at local station 123. Wait for dial tone from PBX. Dial 456. Speak when other party answers.

Lift telephone at local station 123. Wait for dial tone. Dial access code 8. Speak when other party answers.

Lift telephone at local station 123. Wait for dial tone from local PBX. Dial access code 8. Wait for dial tone from remote PBX. Dial station 456. Speak when the other party answers.

Trunk

Side

FXO-TO-FXS

PBX

ST 456

Station

Side

ST 123

LOCAL

MULTISERVER 500

FXO

I/X

Module

MULTISERVER 500

FXS

I/X

Module

Digital

Proc.

Module

REMOTE

Digital

Proc.

Module

ST 123

Station

Side

E&M-TO-FXS

PBX

Trunk

Side

LOCAL

MULTISERVER 500

E&M

I/X

Module

MULTISERVER 500

Digital

Proc.

Module

REMOTE

FXS

I/X

Module

Digital

Proc.

Module

E&M-TO-E&M

LOCAL PBX

ST 123

ST 456

Station

Side

REMOTE PBX

Station

Side

Trunk

Side

Trunk

Side

LOCAL

MULTISERVER 500

E&M

I/X

Module

MULTISERVER 500

E&M

I/X

Module

Digital

Proc.

Module

REMOTE

Digital

Proc.

Module

CHAPTER 6: Operation

Notes About Voice/Fax Channel Parameters

• Voice/fax channel parameters are configured using two separate commands (from the Command Port) or two separate menus (from the LCD/keypad): Voice Channel and Analog Interface.

• The voice/fax channel digitization rate is determined by the setting of the data channel rate. It is assigned the highest fixed rate within the available bandwidth. Available bandwidth equals composite rate minus guaranteed sync channel rate minus overhead. Overhead is 400 bps for composite rates of less than 56 Kbps, and 800 bps for composite rates of 56 Kbps and above.

6.4.3 TO SEND A FAX MESSAGE

Any voice application shown in Figures 6-1 and 6-2 works for fax transmission simply by replacing the telephone sets with fax machines. Make sure both fax machines are powered up and programmed for auto-answer. Then:

1. At the end from where you intend to initiate the fax message, insert the paper, place the fax machine off-hook, dial the number of the remote fax machine (if applicable), and press the START (or SEND) button on the fax machine. Send the fax as you normally would.

2. At the completion of the fax transmission, the voice/fax channel will return to the voice mode.

MULTISERVER 500

You can use two Multiserver 500s as a diagnostics tool. Simply connect two Multiserver 500s back to back and bench-test them. To do this, set both muxes to internal clock and select a composite clock rate. Once you’ve selected a composite clock rate, you must set both the local and remote muxes to the same rate. The procedure is as follows (see Figure 7-1):

1. Connect a crossover cable between the COMPOSITE connectors of the two units.

2. Set the clock rate (9600) of the local unit:

>COM C=I R=9600 <cr>

3. Save the clock rate.

>SA

4. At the remote unit, repeat steps 2 and 3.

NOTE: Both Multiserver 500s must be set to the

same composite clock rate. Otherwise, the system will lock up.

Other diagnostic tests are built into the Multiserver. In addition to the user-initiated tests, the Multiserver 500 undergoes an automatic self-test during power-up.

7.1 Automatic Self-Test

This is a series of tests performed in the following sequence:

• DSP Test

• Checksum Test

• RAM Test

• Composite Loopback Test

• Data Channel Loopback Test

If the DSP test fails, all LEDs will turn on and the unit will remain in this loop. If any other test fails, the TM indicator will flash, and the nature of the problem will be displayed on the LCD.

7.2 User-Initiated Tests

As an aid to installation and fault isolation, the Multiserver 500 incorporates a set of user-initiated diagnostic tests: self-test, local and remote data loopback, local and remote voice/fax loopback, and local and remote composite loopback. You can start these tests either from the LCD/keypad or from an asynchronous terminal connected to the CMD IN (Command Port) connector.

7. Diagnostics and Troubleshooting

Figure 7-1. Clocking, with Multiserver 500s Connected in a Back-to-Back Hookup.

DATA SOURCE

RxC

RxD

TxD

TxC

LOCAL

MULTISERVER 500

Set for

Internal

Clock

RxC

RxD

TxD

TxC

REMOTE

MULTISERVER 500

Set for

Internal

Clock

CHAPTER 7: Diagnostics and Troubleshooting

From the LCD/keypad, follow the path in Figure 7-2 to get the available options and select the appropriate test:

From the Command Port terminal, enter:

>DI=? <cr>

A help screen will appear:

SElftest Perform built in self

test.

EEprom Check NV RAM (active

parameters are saved)

LOCComp Set up for Local

Composite Loopback test.

REMComp Set up for Remote

Composite Loopback test.

LOCDat Set up for Local Data

Loopback test.

REMDat Set up for Remote Data

Loopback test.

TErminate Terminate current test.

NOTE: If you have selected the self-test, local and

remote data loopback tests, or local composite loopback test, the test will stay on until you terminate it. EEPROM and remote composite loopback are timercontrolled tests, and will terminate automatically when the time expires. You cannot initiate another test while the present test is in progress.

To terminate a test from the Command Port, enter:

>DI TErminate.

To terminate a test from the LCD/keypad, follow this path:

Main Menu

Diagnostics

Terminate

Main Menu

Figure 7-2. Tests in the Diagnostics Menu.

Diagnostics

Local

Composite

Remote

Composite

Local

Data

Remote

Self

Data

Test

EEPROM Terminate

MULTISERVER 500

7.2.1 SUGGESTED TEST SEQUENCE

This is a suggested sequence for testing the Multiserver 500.

1. Perform the EEPROM test. If it passes, it verifies that the Multiserver 500 can store and retrieve data from the EEPROM.

2. Perform the Self-Test. If this test passes, the internal circuits of the local Multiserver 500 are operating properly.

3. Perform the Local Data Loopback Test. If this test passes, the data portion of the local serial interface module is operating properly.

4. Perform the Local Composite Loopback Test. This test verifies that the Multiserver 500 can digitize voice as well as multiplex data and voice.

5. Perform the Remote Composite Loopback Test. If this test passes, it verifies that the link is operational, that the local and remote Multiserver 500s can sync up, and that the remote Multiserver 500 responds to commands issued by the local Multiserver 500.

6. Perform the Remote Data Loopback Test. With the link up and running, this test can be used any time if a problem is encountered along the data channel. Since this test does not interfere with normal voice traffic, the voice/fax channel may be used by the operators at each end to compare test results.

7.2.2 EEPROM T

EST

To perform the EEPROM test from the asynchronous terminal connected to the Command Port connector, enter:

>DI EE <cr>.

To perform the EEPROM test from the LCD/keypad, follow this path.

Main Menu

Diagnostics

EEPROM

NOTE: Do not invoke any commands until the

EEPROM test is completed.

The test will last approximately 5 seconds, and the TM LED will be on for the duration of the test.

7.2.3 S

ELF-TEST

You can initiate the self-test from the Command Port menu. Its structure is similar to the automatic self-test, except that it runs in the background.

To perform the self-test from the asynchronous

terminal connected to the Command Port, enter:

>DI SELftest <cr>.

To perform the self-test from the LCD/keypad, follow this path.

Main Menu

Diagnostics

Self Test

Test results are evaluated as follows:

If the DSP test fails, the TM LED will flash. For other test results, access the self-test portion of the STATUS menu from the LCD/keypad, or enter the command SH S from the Command Port terminal.

7.2.4 L

OCAL DATA LOOPBACK TEST

The local data loopback verifies that the serial interface module circuits are capable of bidirectionally processing user data. There is no internal data source included and the remote data channel is not operational during this test.

To run the test, see Figure 7-3 and proceed as follows:

1. Connect an asynchronous terminal to the DATA CHANNEL connector of the Multiserver 500.

CHAPTER 7: Diagnostics and Troubleshooting

2. Configure the asynchronous channel to match your terminal equipment. Refer to Chapter 4 or Chapter 5 for configuration details.

3. Put the Multiserver 500 into local data loopback:

a. From the Command Port, enter:

>DI LOCD <cr>

b. From the LCD/keypad, select from the

diagnostic menu:

Main Menu

Diagnostics

Local Data

4. Verify that the TM indicator light goes on.

5. Type any data on the terminal connected in step 1, and verify that the data is echoed back as typed.

6. Terminate the local data loopback test as described in Section 7.2. Verify that the TM indicator light goes off.

7.2.5 L

OCAL COMPOSITE

LOOPBACK TEST

The main purpose of the local composite loopback test is to verify that the Multiserver 500 is capable of multiplexing voice and data—and to produce a composite stream for transmission to the remote end.

In addition, the local composite loopback test verifies the proper operation of the local voice/fax digitizer.

Test Setup and Signal Flow

Depending on the voice/fax interface module type installed in your Multiserver 500, the local composite loopback test may involve three different setups: FXS, E&M, and FXO. Figure 7-4 shows the test setup and signal flow in a local composite loopback test for a Multiserver 500 fitted with an FXS type voice/fax interface module. See “Notes on FXO and E&M Interfaces” (page 53).

Procedure

1. Connect an asynchronous terminal to the DATA CHANNEL connector of the Multiserver 500.

2. Configure the data channel for asynchronous. Configure the asynchronous channel to match your terminal equipment. Refer to Chapter 4 or Chapter 5 for configuration details.

3. Connect a telephone set to the FXS connector on the voice/fax interface module.

4. Put the Multiserver 500 into local composite loopback:

Figure 7-3. Local Data Loopback Test.

Multiserver 500

Serial

I/F

Module

MULTISERVER 500

Figure 7-5. FXO and E&M Voice/Fax Connections

Figure 7-4. Local Composite Loopback Test.

Voice/Fax

Interface

Module

(FXS)

Multiserver 500

Digital

Processing

Unit

Mux

Serial

Interface

Module

Composite

Driver

PBX

Multiserver 500 with FXO

Access

Trunk

Side

Station

Side

Code

Interface Module

Station

Side

PBX

Trunk

Side

Multiserver 500 with E&M

Interface Module

Access

Code

CHAPTER 7: Diagnostics and Troubleshooting

a. From the Command Port, enter:

>DI LOCComp <cr>

b. From the LCD/keypad, select from the

diagnostic menu as shown below:

Main Menu

Diagnostics

Local Composite

5. Verify that the TM indicator light goes on.

6. Type any data on the terminal connected in step 1, and verify that the data is echoed back as typed.

7. Speak into the telephone. You should hear your own voice echoed back.

8. Terminate the local composite loopback test as described in Section 7.2. Verify that the TM indicator light goes off.

Notes on FXO and E&M Interfaces

Figure 7-5 shows the voice/fax connections for FXO and E&M type voice/fax interface modules; data connections are not repeated. If your Multiserver 500 is fitted with an FXO type voice/fax interface module, you must first dial the station number that connects to the Multiserver 500 in order to perform a voice test.

Similarly, if your Multiserver 500 is fitted with an E&M type voice/fax interface module, you must first dial the access code assigned to the Multiserver 500 in order to perform a voice test.

MULTISERVER 500

7.2.6 REMOTE COMPOSITE LOOPBACK TEST

The main purpose of the Remote Composite Loopback Test is to verify that the link is up and that the local and remote Multiserver 500s can synchronize and communicate. It is a timercontrolled test and will terminate automatically after approximately 30 seconds.

Test Setup and Signal Flow

Figure 7-6 shows the test setup and signal flow for Multiserver 500s with FXS interface in a Remote Composite Loopback Test. See Figure 7-5 for FXO and E&M voice/fax circuit details.

Procedure

1. Connect an asynchronous terminal to the DATA CHANNEL connector of the local Multiserver

500.

2. Configure the data channel for asynchronous. Configure the asynchronous channel to match your terminal equipment. Refer to Chapter 4 or Chapter 5 for configuration details.

3. Connect a telephone set to the FXS connector on the voice/fax interface module.

4. Put the Multiserver 500 into remote composite loopback. To do that,

a. From the Command Port, enter:

>DI REMComp <cr>

b. From the LCD/keypad, select from the

Diagnostics menu as shown below:

Main Menu

Diagnostics

Remote Composite

5. Verify that the TM indicator light goes on.

6. Type any data on the terminal connected in step

1. Verify that the data is echoed back as typed.

7. Speak into the telephone. You should hear your own voice echoed back.

8. The test will expire in approximately 30 seconds and the TM indicator light will go off. If you need additional time to test the voice/fax and or the data channel, repeat step 4.

7.2.7 R

EMOTE DATA LOOPBACK

CHAPTER 7: Diagnostics and Troubleshooting

Voice/Fax

Figure 7-6. Setting Up a Remote Composite Loopback Test.

Interface

Module

(FXS)

Local Multiserver 500

Digital

Processing Module

Mux

Serial

Interface

Module

Composite

Driver

Remote Multiserver 500

Digital

Processing Module

Mux

Composite

Driver

MULTISERVER 500

Figure 7-7. Setting Up a Remote Data Loopback Test.

Voice/Fax

Interface

Module

Local Multiserver 500

Digital

Processing Module

Mux

Serial

I/F

Module

Voice/Fax

Interface

Module

Serial

Interface

Module

Composite

Driver

Remote Multiserver 500

Digital

Processing Module

Mux

Composite

Driver

CHAPTER 7: Diagnostics and Troubleshooting

The remote data loopback test examines the integrity of the data channel across the link. While this test is in progress, it does not affect the normal operation of the voice/fax channel, so you can use the voice/fax channel to talk about the quality of the data channel with someone at the other end. To run the test, see Figure 7-7 and proceed as follows:

1. Connect an asynchronous terminal to the DATA CHANNEL connector of the local Multiserver

500.

2. Configure the local data channel for asynchronous, and configure the asynchronous channel to match your terminal equipment. Refer to Chapter 4 or Chapter 5 for configuration details.

3. Have the remote operator configure his data channel and asynchronous channel.

4. Put the Multiserver 500 into remote data loopback. To do this,

a. From the Command Port, enter

>DI REMD <cr>

b. From the LCD/keypad, enter through the

Diagnostics menu as shown below:

Main Menu

Diagnostics

Remote Data

5. Type any data on the terminal connected in step 1 and verify that the data is echoed back as typed.

6. Terminate the remote data loopback test as described in Section 7.2. Verify that the TM indicator light goes off.

MULTISERVER 500

The FXS Voice/Fax Interface Module provides ringing voltage and battery to the attached telephone equipment. It is normally used to connect the voice/fax channel directly to a telephone instrument or to the line side of a Key Telephone System or fax machine.

NOTE: The FXS voice/fax interface card is not

registered with the FCC, so it cannot be connected to a public network.

Figure A-1 shows a typical FXS application. For clarity, the Multiserver 500 is represented by the FXS voice/fax interface cards.

There are two versions of the FXS Interface Card:

• MX406C—FXS Standard Loop Start. This model meets the safety requirements of North American regulatory agencies.

• MX407C—Enhanced FXS Loop Start. This model meets the safety requirements of all European and North American regulatory agencies.

A.1 Connectors on the Back Panel

Appendix A:

FXS Voice/Fax Interface Module

Figure A-1. A Typical FXS Application.

LOCAL

MULTISERVER 500

FXS

REMOTE

MULTISERVER 500

FXS

APPENDIX A: FXS Voice/Fax Interface Module

There are two connectors on the back panel of the FXS interface card: J2 and TB1 (see Figure A-2). J2, labeled “FXS,” is an RJ-11 modular connector used in most FXS-type applications. TB1 is an 4-pin terminal block that connects to a punch block. Both J2 and TB1 are shielded by a protective cover.

Connectors J2 and TB1 terminate the Tip (T) and Ring (R) leads in parallel, so that pins 2 and 3 of J2 are connected, respectively, to pins 1 and 2 of TB1 (see Figure A-3).

In most applications, use a modular cable (supplied) to connect the voice/fax channel to

telephone equipment. Connect one end of the cable to the FXS connector on the voice/fax interface card. Connect the other end to the telephone equipment.

If you are connecting to a punch block, use the terminal block (TB1). Use a cable with bare-wire leads (not included) to connect the terminal block and the punch block. The terminal block is fitted with a female plug that serves as a receptacle for the individual cable leads.

CAUTION!

Wiring to the trunk terminal block must

Figure A-2. Connectors on the Back Panel of the FXS Interface Module.

Figure A-3. Wiring of the Connectors on the Back Panele.

SG — R T

Legend:

TB1

321

FXS

SG — R T

—

Tip

Ring

No Connection

Signal Ground

SG — R T

TB1

321

FXS

Legend:

Tip

Ring

—

No Connection

Signal Ground

SG — R T

MULTISERVER 500

be carried out by a qualified technician. Wires used for this purpose must be UL

type CM, 22/24 AWG, 4-conductor.

Insert each cable lead into the cutout at the front of the plug and secure it at the top with a small flathead screwdriver. We recommend that you colorcode the cable leads for easy identification.

To make the connection, first remove the female plug. Then insert each cable lead into the cutout on the opening at the front of the plug, and secure it at the top with a screwdriver (see Figure A-4). Finally, reinsert the plug in the terminal block.

After you make the connection, install the connector cover: Insert the right tab of the cover in the retaining slot of the voice/fax interface card’s

Figure A-4. Cable Connections.

Terminal

Block

Back Panel of

Interface Module

Insert Cable

Lead Here

4SG3—2R1

Connector Cover

Modular

Cable

Secure Cable

Leads

Here (4 Places)

Terminal

Block Plug

Right

Tab

APPENDIX A: FXS Voice/Fax Interface Module

back panel, then secure it on the left side with a Phillips-head screw.

A.2 Strapping

Do not alter any of the movable straps on the FXS Interface Module. They are set at the factory to match the type of memory installed, and changing the configuration could easily cause the Card to stop working altogether.

A.3 Removing or Replacing the Module

See Section 3.4 for removal/replacement of the Multiserver 500 interface modules, including the FXS interface card.

A.4 Specifications

Signals Supported — Analog voice and Group 3

facsimile (fax)

Fax Signal Types: — V.21 channel 2, V.27 ter 2400,

V.27 ter 4800, V.29 7200, and V.29 9600

Port Impedance —

Enhanced Model (software-selectable):

600 Ω (Default): Matches line impedance of 600 Ω in series with a 2.15-µf capacitor

Complex: Matches line impedance of 370 Ω in series with a parallel network of a 0.31-µf capacitor and a 620-Ω resistor

220 Ω in series with a parallel network of a 0.12µf capacitor and an 820-Ω resistor

Standard Model:

Fixed at 600 Ω in series with a 2.15-µf capacitor

Insertion Loss — 2 dB nominal @ 1000 Hz (End-

to-End) between Transmit and Receive of Port 1 and Transmit and Receive of Port 2. Example: Port 1 is FXS LS port and Port 2 is FXO LS port.

Port Return Loss — Echo: ≥22 dB; Singing: ≥18

dB; 200 to 3400 Hz: ≥16 dB

Longitudinal Balance — 200 to 1000 Hz: ≥58 dB;

1000 to 3400 Hz: ≥48 dB

Input and Output Level Adjustments — If you

operate your equipment in the U.S.A. or

Canada, input gain and output attenuation are set at the factory to 0/0 dBm, and must not be changed. In other countries, follow the standards of the country where the equipment is used.

Maximum Input and Output Levels — 0 dBm

Frequency Response Over the Range of 300 Hz to

3400 Hz — +1 dB/-2 dB with respect to 1000 Hz

Idle Channel Noise — Inband, “C” Message: ≥20

dBrnc; Psofometric: ≥60 dBmpo; Out of band, 10 KHz to 10 MHz Transverse or Longitudinal Noise: ≤-70 dBm (enhanced models only)

Non-Linear Distortion (Multitone Signal) —

Second Harmonic: ≥40 dB below signal; Third Harmonic: ≥40 dB below signal

Signal-to-Noise Ratio — ≥37 dB @ 1000 Hz

Echo Suppression — ≥35 dB

Echo Canceling — ≤16 ms (≤1000 km or

600 miles)

Crosstalk (near/far end) Between Channels —

≤75 dB

Signaling — Battery current into 130-W load: ≥36

milliamperes; Battery current into 900-W total loop: 20 milliamperes minimum

DC Loop Range — ≤900 Ω

DTMF Distortion (AC) — ≤1.5 %

DP Distortion — ≤2 %

Ringing Tone (Software Selectable) — 20 Hz, 25

Hz (default), or 50 Hz

Ringing Voltage (AC load of 2 ringers [4000 W]

and zero line) — 25-Hz Tone:≥54 Vrms ; 20- and

50-Hz Tones: ≥50 Vrms

Ringing Current — ≤15 milliamperes into 5000-Ω

load

Ring Cadence — Repeated ring (matches ringing

cadence from remote voice/fax channel), interrupted ring 2/4 (2 seconds on, 4 seconds off), or interrupted ring 2/5 (ring two times for

0.4 separated by 0.2 second, then off for two seconds)

MULTISERVER 500

Size — 6.5"W × 6"D (16.5 × 15.2 cm)

APPENDIX B: FXO Voice/Fax Interface Module

The FXO Voice/Fax Interface Module normally attaches to the station side of a PBX or Central Office loop start equipment. It lets the PBX station or central office extend over the Multiserver 500 network to a remote site. Figure B-1 shows a typical FXO application. For clarity, the Multiserver 500 equipment is represented by the interface modules.

There are two versions of the FXO Voice/Fax

Interface Module:

• MX403C—FXO Standard Loop Start. This model meets North American regulatory agency safety requirements.

• MX404C—Enhanced FXO Loop Start. This model meets all European and North American regulatory agency safety requirements.

B.1 Connectors on the Back Panel

Appendix B:

FXO Voice/Fax Interface Module

Figure B-1. A Typical FXO Application.

PBX

Trunk

Side

Station

Side

LOCAL

MULTISERVER 500

FXO

REMOTE

MULTISERVER 500

FXS

MULTISERVER 500

There are two connectors located on the back panel of the FXO: J2 and TB1 (see Figure B-2). J2, labeled FXO, is an RJ-11 modular connector used in most FXO-type applications. TB1 is a 4-pin terminal block used to connect to a punch block. Both J2 and TB1 are shielded by a protective cover.

Connectors J2 and TB1 terminate the Tip (T)

and Ring (R) leads in parallel, so that pins 2 and 3

of J2 are connected, respectively, to pins 1 and 2 of TB1 (see Figure B-3).

In most applications, use a modular cable (included) to connect the voice/fax channel to telephone equipment (see Figure B-4). Connect one end of the cable to the FXO connector on the voice/fax interface module. Connect the other end to your telephone equipment.

Figure B-3. Wiring of the Connectors on the Back Panel.

Figure B-2. Back Panel of the FXO Analog Interface Module.

TB1

SG — R T

Legend:

321

FXO

—

Tip

Ring

No Connection

Signal Ground

SG — R T

J2 (FXO)

TB1

CGND (Chassis Ground)

APPENDIX B: FXO Voice/Fax Interface Module

CAUTION!

Wiring to the terminal block must be carried out by a qualified technician. Wires used for this purpose must be UL type CM, 22/24 AWG, 4-conductor.

Insert each cable lead into the cutout at the front of the plug and secure it at the top with a small flat-

head screwdriver. We recommend that you color code the cable leads for easy identification.

Make the connection by first removing the female plug, inserting each cable lead into the cutout on the opening at the front of the plug, and securing it at the top with a screwdriver (see Figure B-4). Finally, reinsert the plug in the terminal block.

After you make the connection, install the connector cover. To do this, simply insert the right tab of the cover in the retaining slot of the voice/fax interface module back panel. Then secure on the left side with a Phillips-head screw.

B.2 Strapping

Figure B-4. Cable Connections.

Terminal

Block

Back Panel of

Interface Module

Insert Cable

Lead Here

4SG3—2R1

Connector Cover

Modular

Cable

Secure Cable

Leads

Here (4 Places)

Terminal

Block Plug

Right

Tab

MULTISERVER 500

Enhanced FXO Interface Module

There are 12 movable straps located on the enhanced FXO interface module: E1 through E5 and E7 through E13 (see Figure B-5). Their functions are as follows:

1. E1 through E5. These straps are reserved for internal use and are preset at the factory to match the type of memory installed. You must not alter them.

2. Dial Pulse Shaping. Dial pulse shaping is

implemented by an RC network connected across the dial pulse relay U9. To disconnect the RC network, remove strap E7.

3. Dial Pulse Series Resistance. This option selects one of two values of the series resistance in the dial pulse circuit: 150 Ω or 50 Ω (nominal). The default value is 50 Ω. To select the 150-Ω value, move the strap from E9 to E8.

4. Line Impedance Selection. This option selects one of two line-impedance values: 600-Ω resistive and 600-Ω in series with a 2.15-µf

Figure B-5. Locations of the Straps on the FXO Interface Module.

E2 E1

E13

E10

E11

E12

Strapping

600+2.15µf

(Default)

Block

600

APPENDIX B: FXO Voice/Fax Interface Module

capacitor (default). To select 600 Ω resistive, place the strapping block over the right twothirds of E10, E11, and E12 as shown in Figure B-5. To select 600 Ω in series with a 2.15 µf capacitor, place the strapping block over the left two-thirds.

5. E13. This strap is reserved for use in internal tests. Do not alter it.

Standard FXO Interface Card

Do not alter any of the straps on the standard FXO interface module. E1 through E5 have the same function as E1 through E5 in the enhanced model. E11 has the same function as E13 in the enhanced model.

B.3 Removing or Replacing the Module

See Section 3.4 for removing or replacing the Multiserver 500 interface modules, including the FXO interface module.

B.4 Specifications

Signals Supported — Analog voice, Group 3

facsimile (fax), and modem

Fax Signal Types — V.21 channel 2, V.27 ter 2400,

V.27 ter 4800, V.29 7200, and V.29 9600

Port Impedance —

Enhanced Model (Software-selectable)

600 Ω (Default); may be strapped one of two ways: 1. Matches line impedance of 600 Ω resistive; 2. Matches line impedance of 600 Ω in series with a 2.15-µf capacitor (default)

Complex: Matches line impedance of 370 W in series with a parallel network of a 0.3-µf capacitor and a 620-Ω resistor

220 Ω in series with a parallel network of a 0.12µf capacitor and an 820-Ω resistor

Standard Model

Fixed at 600 Ω in series with a 2.15-µf capacitor

Insertion Loss — 2 dB nominal @ 1000 Hz (End-

to-End) between Transmit and Receive of Port 1 and Transmit and Receive of Port 2.

Example: Port 1 is FXO LS port and Port 2 is

FXS LS port.

Port Return Loss — Echo Return Loss: ≥22 dB;

Singing Return Loss: ≥18 dB 200 to 3400 Hz: ≥16 dB

Longitudinal Balance — 200 Hz to 1000 Hz: ≥58

dB; 1000 Hz to 3400 Hz: ≥48 dB

Input and Output Levels: — If you operate your

equipment in the U.S.A or Canada, input gain and output attenuation are set at the factory to 0/0 dBm, and must not be changed. In other countries, follow the standards of the country where the equipment is used.

Maximum Input andOutput Levels — 0 dBm

Idle Channel Noise — Inband, “C” Message: ≥20

dBrnc; Psofometric: ≥60 dBmpo; Out of band, 10 KHz to 10 MHz, Transverse or Longitudinal Noise: ≤70 dBm (enhanced models only)

Non-Linear Distortion, Second and Third

Harmonics (Multitone Signal) — ≥40 dB below

signal level

Signal-to-Noise Ratio — ≥37 dB @ 1000 Hz

Echo Suppression — ≥35 dB

Echo Canceling — ≤16 ms (≤1000 Km or

600 miles)

Crosstalk (near/far end) Between Channels —

≤75 dB

Signaling — DC Pulse Distortion Make/Break: ≤3

%; AC DTMF, Transparently Passed: ≤1.5%

DC Loop Range — 48 V Battery: ≤1750 W; 42.5 V

Battery: ≤1500 W

Off-Hook DC V/I Characteristics at Tip-Ring —

≤300 W

Ringing Voltage Input 18 to 53 Hz — Detect: ≥25

Vrms; Not Detect: ≤ 20 Vrms

Ringing Cadence Repeat Distortion — ≤2 %

Size — 6.5"W × 6"D (16.5 × 15.2 cm)

MULTISERVER 500

The E&M Voice/Fax Interface Card interfaces the voice/fax section of the Multiserver 500 with the trunk side of a Private Branch Exchange (PBX) as shown in Figure C-1. This type of telephone interface breaks out the audio signal and status control (or signaling) on separate wires.

Audio is transmitted on either a single pair (2-wire operation) of wires labeled T/R, or on two pairs (4-wire operation) of wires labeled T/R and T1/R1, as configured. When configured for 2-wire operation, the T/R pair transmits and receives communications. When configured for 4-wire operation, the T/R pair transmits and the T1/R1 pair receives.

Signaling consists of an M lead and an E lead. In the E&M interface module the M lead is defined as the input or receive lead and the E lead is defined as the output or transmit lead. In some cases added return leads termed SB and SG are used.

There are five E&M signaling formats defined: Types I, II, III, IV, and V. However, only three formats are in common use today: Types I, II, and V.

Type I is the most common type used in the United States, while Type V is common throughout the rest of the world. Type II was designed for compatibility with some AT&T

PBX types.

C.1 Differences Between Models

There are two versions of the E&M Voice/Fax Interface Card:

• MX401C—E&M Standard. This model meets all North American regulatory-agency safety requirements. It uses the Type I signaling convention.

• MX402C—E&M Enhanced. This model meets all European and North American regulatoryagency safety requirements. You may strap it one of three ways to match the signaling convention of the interfacing PBX equipment: Type I, II, or V.

Unless specified otherwise, information in this appendix applies to both models.

Appendix C:

E&M Voice/Fax Interface Module

Figure C-1. Connections for the E&M Voice/Fax Interface Module.

PBX

Trunk

Station

Side

R T1 R1

MULTISERVER 500

E&M

Interface

Module

T1 R1

APPENDIX C: E&M Voice/Fax Interface Module

C.2 Telephone-Interface Connectors

The telephone interface signals are terminated in an 8-pin tie trunk terminal block on the back panel (see Figure C-2). This connector is fitted with a female plug.

C.3 Connecting the Telephone-Interface Cable

To connect to the telephone interface (PBX), see Figure C-3 (page 70) and proceed as follows:

WARNING!

Remove the power plug from the power socket BEFORE you make any connections to the telephone interface.

CAUTION!

Wiring to the tie trunk terminal block must be carried out by a qualified technician. Wires used for this purpose must be UL type CM, 22/24 AWG, 8-conductor.

1. Remove the plug from the 8-pin terminal block.

2. Use a cable with bare-wire leads (not included). Insert each cable lead into the cutout at the front of the plug and secure it with a small flathead screwdriver at the top. We recommend that you color-code the cable leads for easy identification.

3. Insert the plug, which now includes the cable leads, in the terminal block.

4. After you make the connection, install the connector cover: Insert the right tab of the cover in the retaining slot of the voice/fax interface module back panel; then secure it on the left side with a Phillips-head screw.

C.4 E&M Lead States

Figure C-2. Connectors on the Back Panel.

SB E M SG

8 765

SB E M SG

R T R1 T1

4 321

R T R1 T1

MULTISERVER 500

Figure C-3. Connecting the E&M Cable.

Terminal

Block

87654321

SB M E SG R1 T1 R T

Back Panel of

Interface Module

Insert Cable

Lead Here

M E SG R1 T1 R T

Connect to PBX

(Figures C-4 through C-6)

Connector Cover

Secure Cable Leads

Here (8 Places)

Terminal

Block Plug

Right

Tab

APPENDIX C: E&M Voice/Fax Interface Module

Table C-1 is a summary of the E and M idle and active lead states for signaling Types I, II, and V.

C.5 Connection Diagrams

Figures C-4 through C-6 are simplified connection diagrams between the E&M voice/fax interface module and the PBX for signaling types I, II, and V. As discussed earlier, Types II and V are supported only by the MX402C.

Table C-1. E&M Lead States

Lead State Type I Type II Type V

E (output) Idle Open Open Open

Active SG Close (SG) SG

M (input) Idle SG Open Open

Active -48 V Close (SB) SG

SG = Signal Ground SB = Signal Battery

MULTISERVER 500

Figure C-4. Type I Interface Connection.

PBX

E&M Interface Module

Strapped for Type I

-48V

4-wire

Operation

Detector

2-wire

Operation

GND

R T1

Detector

E14

E15

1µf

C36

E17

APPENDIX C: E&M Voice/Fax Interface Module

PBX

Figure C-5. E&M Type II Interface Connection.

E&M Interface Module

Strapped for Type II

E16

SB SB

-36V

-48V

4-wire

Operation

Detector

2-wire

Operation

GND

R T1

Detector

E14

E15

1µf

C36

E17

MULTISERVER 500

Figure C-6. E&M Type V Interface Connection.

E&M Interface Module

Strapped for Type V

PBX

SB SB

E&M Interface Module

Strapped for Type II

E16

-48V

4-wire

Operation

Detector

2-wire

Operation

GND

R R1

Detector

-36V

E14

E15

1µf

C36

E17

APPENDIX C: E&M Voice/Fax Interface Module

C.7 Strapping

Enhanced E&M Voice/Fax Interface Card

The functions of straps E1 through E22 on the enhanced E&M interface card (see Figure C-7) are as follows:

1. E1 through E5. These straps are preset at the factory to match the type of memory installed. Do not alter them.

2. E6, E7, and E9 through E13. These straps are used to select signaling types I, II, and V (MX402C only).

3. Straps E8 and E17 are normally installed to shunt out DC blocking capacitors C36 and C38. Remove them if there are DC voltages present in

the R and R1 leads.

4. Strap E14 is used to shunt out the series resistor in the E lead in case the loop resistance is too high to trip the detector inside the PBX.

5. Strap E15 is used for dial-pulse correction; it connects a 1-µF filter capacitor between the SG lead and ground.

6. Strap E16 is used to shunt out the series resistor in the SB lead in case the loop resistance is too high to trip the detector inside the interface module.

7. Straps E18 and E19 are reserved for use in internal tests. Do not alter them.

8. Straps E20, E21, and E22 are spares.

Figure C-7. Where the Straps Are on the E&M Module.

S/N

E2 E1

E5E4E3

E17C38

E18

TYPE I

E14 E15

E9 E10

E11

TYPE II

E12

E13

C36

E16

E19

E20 E21 E22

TYPE V

MULTISERVER 500

Standard E&M Voice/Fax Interface Card

The functions of the straps on the standard E&M voice/fax interface module are as follows:

1. E1 through E-5 have the same functions as E1 through E5 in the enhanced model.

2. E9 has the same function as E14 in the enhanced model.

3. E6 and E7 have the same functions as E18 and E19 in the enhanced model.

4. E8 is a spare in the standard model.

C.7 Removing or Replacing the Module

See Section 3.4 for removal/replacement of the Multiserver 500 interface modules, including the E&M interface module.

C.8 Specifications

Signals supported — Analog voice and Group 3

facsimile (fax)

Fax Signal Types — V.21 channel 2, V.27 ter 2400,

V.27 ter 4800, V.29 7200, and V.29 9600

Port Impedance —

4-wire, and 2-wire Standard Models: Matches line

impedance of 600 Ω resistive.

2-wire (Enhanced model only, software selectable: 600

Ohms (Default): Matches line impedance of 600 Ω resistive; Complex: Matches line impedance of 370 Ω in series with a parallel network of a

0.31-µf capacitor and a 620W resistor, or 220 Ω in series with a parallel network of a 0.12-µf capacitor and a 620 Ω resistor

Port Return Loss — Echo Return Loss: ≥22 dB;

Singing Return Loss: ≥18 dB; 200 to 3400 Hz: 16 dB

Longitudinal Balance — Up to 1000 Hz: ≥58 dB;

1000 Hz to 3400 Hz:≥48 dB

Input and Output Level Adjustments — If you

operate your equipment in the U.S.A. or Canada, input gain and output attenuation are

set at the factory to 0/0 dBm, and must not be changed. In other countries, follow the standards of the country where the equipment is used.

Maximum Input Level — 0 dBm

Maximum Output Level (Enhanced Model) — 4-

wire: + 7 dBm; All others: 0 dBm

Insertion Loss at 1000 Hz — 2-wire T/R of Port 1

to 2-wire T/R of Port 2: 2 dB nominal; 4-wire T/R of Port 1 to 4-wire T1/R1 of Port 2: 2 dB nominal

Frequency Response Over the Range of 304 Hz to

3404 Hz — +1 dB/-2 dB with respect to 1004 Hz

Idle Channel Noise — Inband “C” Message: ≤ 20

dBrnc/65 dBmpo; Psofometric: ≤ 65 dBrnc/65 dBmpo; Out of band, 10 KHz to 10 MHz

Transverse or Longitudinal Noise — ≤-70 dBm

(enhanced models only)

Non-Linear Distortion (Multitone Signal), Second

and Third Harmonics — ≥40 dB below signal

level

Signal-to-Noise Ratio at 1004 Hz — ≥37 dB

Echo Suppression (2-wire) — ≥35 dB

Echo Canceling (2-wire) — ≤16 ms (≤1000 km or

600 miles)

Loop Range Including Instrument — ≤900 ohms;

1372 m (4500 feet) on 24 AWG wire pair

Signaling — E-Lead Current Limit: ≤ 25 ma; M-

Lead Sensitivity: ≤1400 ohms DC Pulse Distortion: ≤2%

Signaling Formats — AC: DTMF @ 2280 Hz

(AC15, 4-wire); DC: Steady or Pulsed

Types — Enhanced Model: Types I, II, and V;

Standard Model: Type I only

Size — 6.5"W × 6"D (16.5 × 15.2 cm)

APPENDIX D: Changing the Data Interface Types

You can configure the DATA CHANNEL and COMPOSITE interface connectors to give one of three types of signal levels: RS-232, V.35, or RS-530. Configuration is implemented by a set of daughterboards and jumper blocks.

A fourth interface type, RS-449, can be derived from an RS-530 interface type using special converter cables. A fifth composite interface type, X.21, may be derived from an RS-530 type using X.21 special converter cables. Refer to Appendix F for cabling details.

Both interface connectors are configured at the factory to signal-level types specified with the order. If you need to change the interface type of either or both connectors, read the rest of this appendix.

WARNING!

To change interface types, you must remove the top cover in order to gain access to the interior of the Multiserver

500. Do NOT attempt to remove the top cover while the Multiserver 500 is connected to the power source.

Appendix D:

Changing the Data Interface Types

Figure D-1. Removing the Top Cover.

MULTISERVER 500

EXE

(4 Places)

MULTISERVER 500

CAUTION!

Observe standard industry practices concerning the handling of staticsensitive electronic components. Use suitable grounding for the unit, in your work area, and on your person.

D.1 Removing the Top Cover

Items used to configure the interface types are located on the top module and are accessible when the top cover is removed. The top cover is fastened by four screws, two on each side. Remove and save the four screws, using a number 1 or number 2 Phillips-head screwdriver; then lift off the cover. See Figure D-1.

D.2 Configuring the Interfaces

Composite Interface

Table D-1 is a configuration matrix for the composite interface. The column headings in Table D-1 relate to items highlighted in Figure D-2. To configure an interface type, first consult Table D1 to determine the requirements for that interface. Then, find the locations of the items associated with that interface and install (or remove) as necessary.

For example, to configure the composite interface for V.35, move down the Interface Type column in Table D-1 to V.35, and check all columns along that row. You will note that the Model MX410C-V.35 daughterboard must be installed, headers X3 and X4 must be removed, and jumper E11 and E4 must be installed on pins 1-2. You will also find that the interface cable number required for this interface is EHN070.

Finally, install or remove the applicable items, using Figure D-1 as a guide.

Data Channel Interface

Table D-1. List of Configuration Items for the Composite Interface

Interface Daughterboard Cable Headers Jumper Jumper Type A B X3 and X4 E11 E4

RS-232 None EZ423 Installed Installed Installed

crossover on pins on pins

2-3 1-2

V.35 Model EHN070 Removed Installed Installed

MX410C-V.35 crossover on pins on pins

1-2 1-2

RS-530 Model EHN077-005M Removed Installed Installed

MX410C-422 crossover on pins on pins

2-3 1-2

RS-449 Model EHN075-005M Removed Installed Installed

MX410C-422 crossover on pins on pins

2-3 1-2

X.21 Model EHN073-005M Removed Installed Installed

MX410C-422 crossover on pins on pins

2-3 2-3

APPENDIX D: Changing the Data Interface Types

Figure D-2. Configuring the Composite Interface.

J11 J10

E11

X3 and X4

3 2

3 2 1

E11

123

E11

MULTISERVER 500

To configure the data channel interface, consult Table D-2 and Figure D-3 and follow the guidelines given for the composite interface.

Interface Daughterboard Cable D Headers Jumper Type C X2 and X5 E10

RS-232 None EDN16C Installed Installed on pins 2-3

straight

V.35 Model EHN071 Removed Installed on pins 1-2

MX410C-V.35 straight

RS-530 Model EHN076-005M Removed Installed on pins 2-3

MX410C-422 straight

RS-449 Model EHN074-005M Removed Installed on pins 2-3

MX410C-422 straight

X.21 Model EHN072-005M Removed Installed on pins 2-3

MX410C-422 straight

Table D-2. List of Configuration Items for the Data Channel Interface

D.3 Replacing the Top Cover

After you configure the interface connectors, replace the top cover and secure it with the four screws removed in Section D.1.

APPENDIX D: Changing the Data Interface Types

Figure D-3. Configuring the Data-Channel Interface.

X2 and X5

123

E11

J11 J10

123

E11

E10

MULTISERVER 500

Information provided in the following paragraphs is applicable only to Multiserver 500 units installed in the U.S.A. and Canada. If your installation is located outside of the U.S.A. and Canada, you must meet the requirements of the country where the equipment is operated.

E.1 Requirements for Operation with the Telephone Company

If your equipment causes harm to the telephone network, the telephone company may temporarily discontinue your service. If possible, the company will notify you in advance. But if advance notice is not practical, you will be notified as soon as possible. You will be given the opportunity to correct the situation and you will be informed of your right to file a complaint with the FCC.

Your telephone company may make changes in its facilities, equipment, operation, or procedures that could affect the proper functioning of your equipment. If it does, you will be notified in advance to give you an opportunity to maintain uninterrupted service.

If you experience any operational problems while you’re using your equipment, determine whether the problem is due to a malfunction in your equipment or in the telephone interface.

WARNING!

Do not attempt to repair the Multiserver

500. Attempts to repair the Multiserver 500 may cause injury, and may also damage equipment on the telephone network.

Attempts to repair the Multiserver 500 are violations of FCC rules. Repair to the Multiserver 500 can only be made by the manufacturer, its authorized agents, and by others who may be authorized by the FCC. Please contact our Technical Support Staff for further information.

1. The problem may be in the telephone interface. If the Multiserver 500 works in some interfaces

but not in others, the problem is due to the telephone interface.

2. The problem may be in your equipment. If the Multiserver 500 does not work with any telephone interface, then it is most likely that the problem is in your Multiserver 500. To check your Multiserver 500, follow the test procedures outlined in Chapter 7.

E.2 Equipment Attachment Limitations for

Operation in Canada

CP-01, Part I

Section 10.1

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

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

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

Users should ensure for their own protection that the electrical ground connections of the power utility, telephone lines and internal metallic water pipe system, if present, are connected together. This

Appendix E: Agency and

Telephone-Company Requirements

APPENDIX E: Agency and Telephone-Company Requirements

precaution may be particularly important in rural areas.

CAUTION!

You should NOT attempt to make such connections yourself, but should contact the electric inspection authority or electrician, as appropriate.

CP-01, Part I,

Section 10.2

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

MULTISERVER 500

IMPORTANT!

The composite and data channel connectors require shielded cables in order to maintain compliance with Title 47 of the Code of Federal Regulations, Federal Communications Commission’s Rules and Regulations, Part 15, Subpart J.

This Appendix contains cabling diagrams and pin assignments for the COMPOSITE, DATA CHANNEL, and CMD PORT interface connectors. Refer to the diagrams if you intend to construct your own cables. Cable length must not exceed 50 feet (15 meters).

Cabling for the voice/fax channel depends on the type of interface module installed in the Multiserver 500, and is given in Appendixes A, B, and C.

F.1 Cables for the Composite Interface

RS-232-to-RS-232 DCE

Pin assignments for the COMPOSITE and DATA CHANNEL connectors configured for RS-232 signal levels are shown in Figure F-1. Use a crossover cable (order code EZ423-0015), with male terminations at each end, for connection to a DCE device. See Figure F-2.

Appendix F: Cabling and Pin Assignments

Figure F-1. Pin Assignments for the RS-232 COMPOSITE and DATA CHANNEL Connectors.

GROUND

RTS

CTS

DSR

SIGNAL GROUND

RLSD

UNASSIGNED

TX CLOCK

RX CLOCK

EXTERNAL RX CLOCK

DTR

EXTERNAL TX CLOCK

BUSY

PIN 13

PIN 25

PIN 1

DCE

PIN 14

APPENDIX F: Cabling and Pin Assignments

PIN 1

Figure F-2. RS-232-to-RS-232 DCE Crossover Cable (EZ423-0015).

25-PIN CONNECTOR

(MALE)

25-PIN CONNECTOR

(MALE)

GROUND

RTS

CTS

DSR

SIGNAL GROUND

RLSD

UNASSIGNED

TX CLOCK

RX CLOCK

EXTERNAL RX CLOCK

DTR

EXTERNAL TX CLOCK

BUSY

TO MULTISERVER

COMPOSITE CONNECTOR

TO DCE

DEVICE

MULTISERVER 500

V.35-to-DCE

Pin assignments for the COMPOSITE and DATA CHANNEL connector configured for V.35 signal levels are shown in Figure F-3 Use a crossover cable with male terminations at each end. See Figure F-4.

RS-530-to-RS-530 DCE

Figure F-3. Pin Assignments for the V.35 COMPOSITE and DATA CHANNEL Connectors.

RD A

RD B

SER. CLK. RX EXT A

SER. CLK. RX EXT B

TD A

TD B

SER. CLK. TX EXT A

SER. CLK. TX EXT B

SER. CLK. RX A

SER. CLK. TX B

DTR

DSR

RLSD

UNASSIGNED

RTS

PIN 13

PIN 25

PIN 1

DCE

PIN 14

BUSY IN

CTS

SER. CLK. TX A

SER. CLK. TX B

SIGNAL GROUND

APPENDIX F: Cabling and Pin Assignments

PIN 1

Figure F-4. V.35-to-DCE Crossover Cable (EHN070-005M).

DB25 CONNECTOR

RD A

RD B

SER. CLK. RX EXT. A

SER. CLK. RXEXT. B

TD A

TD B

SER. CLK. TX EXT. A

SER. CLK. TX EXT. B

SER. CLK. RX A

SER. CLK. RX B

DTR

DSR

RLSD

UNASSIGNED

RTS

P1 (MALE)

V.35 CONNECTOR

P2 (MALE)

TD A

TD B

SER. CLK. TXA

SER. CLK. TXB

RD A

RD B

SER. CLK. RX A

SER. CLK. RX B

SER. CLK. TX EXT. A

SER. CLK. TX EXT. B

DSR

DTR

RTS

UNASSIGNED

RLSD

BUSY IN

SIGNAL GROUND

TO MULTISERVER

COMPOSITE CONNECTOR

BUSY IN

TO DCE INTERFACE

SIGNAL GROUND

MULTISERVER 500

Pin assignments for the COMPOSITE and DATA CHANNEL connectors configured for RS-530 signal levels are shown in Figure F-5. Use a crossover cable (order code TC) with male terminations at each end to connect to an RS-530 DCE device. See Figure F-6.

RS-530-to-RS-449 DCE Crossover Cable

Figure F-5. Pin Assignments for the RS-530 COMPOSITE and DATA CHANNEL Connectors.

TD A

TD B

RD A

RD B

RLSD A

RLSD B

RTS A

RTS B

DTE TSET A

DTE TSET B

DTE TSET A

DTE TSET B

DCE RSET A

DCE RSET B

DTER A

PIN 13

PIN 25

PIN 1

DCE

PIN 14

DTER B

DCER A

DCER B

DCE TSET A

DCE TSET B

SIGNAL GROUND

SHIELD

APPENDIX F: Cabling and Pin Assignments

Figure F-6. RS-530-to-RS-530 DCE Crossover Cable.

PIN 1 PIN 1

DB25 CONNECTOR

P1 (MALE)

TD (A)

TD (B)

RD (A)

RD (B)

RLSD (A)

RLSD (B)

RTS (A)

RTS (B)

DTE-RSET (A)

DTE-RSET (B)

DTE-TSET (A) DCE-RSET (A)

DTE-TSET (B)

DCE-RSET (A)

DCE-RSET (B)

DTER (A)

DB25 CONNECTOR

P2 (MALE)

RD (A)

RD (B)

TD (A)

TD (B)

RTS (A)

RTS (B)

RLSD (A)

RLSD (B)

DCE-TSET (A)

DCE-TSET (B)

DCE-RSET (B)

DTE-RSET (A)

DTE-RSET (B)

DCER (A)

DTER (B)

DCER (A)

DCER (B)

SIGNAL GROUND

SHIELD

COMPOSITE CONNECTOR

TO MULTISERVER

DCER (B)

TO DCE

INTERFACE

DTER (A)

DTER (B)

SIGNAL GROUND

SHIELD

MULTISERVER 500

Pin assignments for the COMPOSITE and DATA CHANNEL connectors configured for RS-530 signal levels are shown in Figure F-5. Use a crossover cable (order number EHN075-005M) with male

terminations at each end to connect to an RS-449 DCE device. See Figure F-7.

RS-530-to-X.21 DCE Crossover Cable

Figure F-7. RS-530-to-RS-449 DCE Crossover Cable.

PIN 1

DB25 CONNECTOR

P1 (MALE)

TD (A)

TD (B)

RD (A)

RD (B)

RTS (A)

RTS (B)

DCER (A)

DB37 CONNECTOR

P2 (MALE)

RD (A)

RD (B)

SD (A)

SD (B)

RR (A)

RR (B)

TR (A)

DCER (B)

RLSD (A)

RLSD (B)

DTE-RSET (B) TT (A)

DCE-RSET (B)

DTE-RSET (A)

DTE-RSET (B)

DTER (A)

DTER (B)

DTE-TSET (A)

DTE-TSET (B)

SHIELD

SIGNAL GND

TM.

TR (B)

RS (A)

RS (B)

TT (B)

ST (A)

ST (B)

DM (A)

DM (B)

RT (A)

RT (B)

SHIELD

SIGNAL GROUND

TO MULTISERVER

COMPOSITE CONNECTOR

TO DTE

INTERFACE

APPENDIX F: Cabling and Pin Assignments

Pin assignments for the COMPOSITE connector configured for RS-530 signal levels are shown in Figure F-5. Use a crossover cable (order code EHN073-005M) with male terminations at each end to connect to an X.21 DCE device. See Figure F-8.

Figure F-8. RS-530-to-X.21 DCE Crossover Cable.

PIN 1

DB25 CONNECTOR

TD (A)

TD (B)

RD (A)

RD (B)

RLSD (A)

RLSD (B)

RTS (A)

RTS (B)

DTE-TST (A)

DTE-TST (B)

SIGNAL GROUND

SHIELD

TO MULTISERVER

COMPOSITE CONNECTOR

P1 (MALE)

DB15 CONNECTOR

P2 (FEMALE)

RD (A)

RD (B)

TD (A)

TD (B)

RTS (A)

RTS (B)

RLSD (A)

RLSD (B)

DCE-RST (A)

DCE-RST (B)

SIGNAL GROUND

SHIELD

TO DCE

INTERFACE

MULTISERVER 500

F.2 Data-Channel Interface Cables

RS-232 to DTE

Pin assignments for the DATA CHANNEL connector configured for RS-232 signal levels are shown in Figure F-1. Use a straight cable (order code EDN16C-xxxx-MF) with male-to-female terminations. See Figure F-9.

Figure F-9. RS-232-to-DTE Straight Cable (EDN16C-xxxx-MF).

PIN 1

25-PIN CONNECTOR

(MALE)

25-PIN CONNECTOR

(FEMALE)

GROUND

RTS

CTS

DSR

SIGNAL GROUND

RLSD

UNASSIGNED

TX CLOCK

RX CLOCK

EXTERNAL RX CLOCK

DTR

EXTERNAL TX CLOCK

GROUND

RTS

CTS

DSR

SIGNAL GROUND

RLSD

UNASSIGNED

TX CLOCK

RX CLOCK

EXTERNAL RX CLOC

DTR

EXTERNAL TX CLOC

BUSY

TO MUTISERVER

DATA CHANNEL CONNECTOR

TO DTE

INTERFACE

BUSY

APPENDIX F: Cabling and Pin Assignments

V.35 to DTE

Pin assignments for the DATA CHANNEL connector configured for V.35 signal levels are shown in Figure F-3. Use a straight cable (order code EHN071-005M) with male-to-female terminations. See Figure F-10.

Figure F-10. V.35-to-DTE Straight Cable (EHN071-005M)

PIN 1

DB25 CONNECTOR

TD A

TD B

SER. CLK. TX A

SER. CLK. TX B

RD A

RD B

SER. CLK. RX A

SER. CLK. RX B

SER. CLK. TX. EXT A

SER. CLK. TX. EXT B

DSR

DTR

RTS

CTS

RLSD

P1 (MALE)

V.35 CONNECTOR

P2 (FEMALE)

TD A

TD B

SER. CLK. TX A

SER. CLK. TX B

RD A

RD B

SER. CLK. RX A

SER. CLK. RX B

SER. CLK. TX. EXT A

SER. CLK. TX. EXT B

DSR

DTR

RTS

CTS

RLSD

BUSY

SIGNAL GROUND

TO MULTISERVER

DATA CHANNEL CONNECTOR

BUSY

TO DTE

INTERFACE

SIGNAL GROUND

MULTISERVER 500

RS-530-to-RS-530 DTE

Pin assignments for the DATA CHANNEL connector configured for RS-530 signal levels are shown in

Figure F-5. Use a straight cable (order code EHN076-005M) with male-to-female terminations, to connect to an RS-530 DTE device. See Figure F-11.

Figure F-11. RS-530-to-RS-530 DTE Straight Cable.

PIN 1

DB25 CONNECTOR

P1 (MALE)

TD (A)

TD (B)

RD (A)

RD (B)

RTS (A)

RTS (B)

CTS (A)

CTS (B)

PIN 1

DB25 CONNECTOR

P2 (FEMALE)

TD (A)

TD (B)

RD (A)

RD (B)

RTS (A)

RTS (B)

CTS (A)

CTS (B)

DCER (A)

DCER (B)

RLSD (A) RLSD (A)

RLSD (B)

DCE-RSET (A)

DCE-RSET (B)

DCE-TSET (A)

DCE-TSET (B)

DTER (A)

DTER (B)

DTE-TSET (A)

DTE-TSET (B)

DTE-RSET (A)

DTE-RSET (B)

SIGNAL GROUND

SHIELD

DCER (A)

DCER (B)

RLSD (B)

DCE-RSET (A)

DCE-RSET (B)

DCE-TSET (A)

DCE-TSET (B)

DTER (A)

DTER (B)

DTE- TSET (A)

DTE-TSET (B)

SIGNAL GROUND

SHIELD

TO MULTISERVER

DATA CHANNEL CONNECTOR

TO DTE

INTERFACE

APPENDIX F: Cabling and Pin Assignments

RS-530-to-RS-449 DTE

Pin assignments for the DATA CHANNEL connector configured for RS-530 signal levels are

shown in Figure F-5. Use a straight cable (order code EHN074-005M) with male-to-female terminations, to connect to an RS-449 DTE device. See Figure F-12.

DB25 CONNECTOR

P1 (MALE)

DB37 CONNECTOR

P2 (FEMALE)

RLSD (A) RR (A)

RLSD (B)

DCER (B)

DCER (A)

CTS (B)

CTS (A)

RTS (B)

RTS (A)

RD (B)

RD (A)

TD (B)

TD (A)

DM (B)

DM (A)

CS (B)

CS (A)

RS (B)

RS (A)

RD (B)

RD (A)

SD (B)

SD (A)

RR (B)

TO MULTISERVER

DATA CHANNEL CONNECTOR

SIGNAL GROUND

TO DTE

INTERFACE

DTE-RSET (B)

DTE-RSET (A)

DTE-TSET (B)

DTE-TSET (A)

DTER (B)

DTER (A)

DCE-RSET (B)

DCE-RSET (A)

DCE-TSET (B)

DCE-TSET (A)

TT (B)

TT (A)

TR (B)

TR (A)

RT (B)

RT (A)

ST (B)

ST (A)

SIGNAL GROUND

GROUND

SHIELD

PIN 1

Figure F-12. RS-530-to-RS-449 DTE Straight Cable.

MULTISERVER 500

RS-530-to-X.21 DCE Straight Cable

Pin assignments for the DATA CHANNEL connector configured for RS-530 signal levels are shown in Figure F-5. Use a straight cable (order code EHN072-005M) with male/female terminations to connect to an X.21 DTE device. See Figure F-13.

Figure F-13. RS-530-to-X.21 DTE Straight Cable.

PIN 1

DB25 CONNECTOR

P1 (MALE)

TD (A)

TD (B)

RD (A)

RD (B)

RTS (A)

RTS (B)

RSLD (A)

RLSD (B)

DCE-RSET (A)

DCE-RSET (B)

SIGNAL GROUND

SHIELD

TO MULTISERVER

DATA CHANNEL CONNECTOR

DB15 CONNECTOR

P2 (FEMALE)

TO DTE

INTERFACE

T (A)

T (B)

R (A)

R (B)

C (A)

C (B)

I (A)

I (B)

S (A)

S (B)

SIGNAL GROUND

SHIELD

GLOSSARY

AC-15

A variation of the E&M signaling format used in Great Britain. See definition under tone signaling. For other options, see DC signaling and pulsed DC.

Attenuation

Decrease or deterioration of signal strength. Within the Multiserver 500, attenuation is a configurable option for output signal levels in 1-dB increments. See also maximum output level.

Bit

Contraction of binary digit. The smallest unit of information and the basic unit in digital data communications. A bit can have a zero or a one value (mark or space in data communications terminology).

Buffer

A temporary storage area to absorb the difference in either the rate of data flow or the time of occurrence of events in transmissions from one device to another.

Busy state

One of three configuration options that selects the way the Multiserver 500 controls the busy state of the voice/fax channel: always off, always on, or system-controlled.

Composite

The multiplexed output of the Multiserver 500 that includes voice or fax and synchronous or asynchronous data.

Composite loopback

A diagnostic test that loops back the composite data. May be local or remote.

Daisychaining

A topology for connecting Multiserver 500 Command Ports together. It allows multiple local Multiserver 500s to be controlled from a single asynchronous terminal.

Data loopback

A diagnostic test that loops back the data portion of the signal but does not affect voice/fax operation. May be local or remote.

dB, decibel

A relative measure (logarithmic) of change in signal power.

DBA

Dynamic Bandwidth Allocation, a method used to allocate additional bandwidth to the synchronous data channel when the voice/fax channel is not in use.

dBm

An absolute measure of signal power, where 0 dBm equals 1 milliwatt into 600 ohms.

DC signaling

A configurable option in the Multiserver 500 fitted with an E&M-strapped voice/fax interface module. With this option, the channel senses the idle/active status by the DC condition of the M-lead, and indicates the idle/active status to the remote end by the DC condition on the E-lead. See AC-15 and pulsed DC.

Decading pulsing

See pulse dialing.

Glossary

MULTISERVER 500

DID

Direct Inward Dialing, a service offered by the telephone company. It lets you dial an internal extension without passing through the operator. Billing does not start until the extension answers.

DISA

Direct Inward System Access, a service offered by a PBX. It lets incoming calls to the PBX have dialing access within the private network. May often be protected by a dialed password. Billing starts at the time when the PBX provides the dial tone.

DIT

Direct In Termination, a service offered by a PBX. It lets incoming calls to the PBX be routed directly to a selected telephone or group of telephones without operator intervention. Billing does not start until the telephone answers.

DSP

Digital Signal Processor, a microprocessor incorporated in the Multiserver 500 and used for voice compression and fax demodulation.

DTMF

Dual Tone Multifrequency, used for call addressing in pushbutton telephones. Also known as Multifrequency Push-Button (MFPB) in Europe.

Dynamic bandwidth allocation

See DBA.

E&M

In industry usage, a signaling convention between voice PBXs. As related to the Multiserver 500, an interface module compatible with the tie-trunk side of a voice PBX.

Extra gain

See maximum output level.

Fax, facsimile

Transmission of hardcopy images (written, typed, or drawn material) through the voice/fax channel.

FX, foreign exchange service

A telephone service provided to a subscriber from a central office which is located outside the subscriber’s exchange area.

FXO, foreign exchange office

A voice/fax interface module that connects to the station side of the local PBX or central office.

FXS, foreign exchange station

A voice/fax interface module that connects to the telephone equipment at the subscriber’s foreign exchange station.

Guaranteed rate

A Multiserver 500 configuration option (“rate” in the configuration menus) that specifies the amount of link bandwidth allocated to the synchronous data channel when the voice/fax channel is in use.

Header

Pins on a circuit board onto which a jumper can be installed for purposes of hardware configuration.

Hook

One of the Multiserver 500 options controlling Dynamic Bandwidth Allocation (DBA). When selected, it provides indication when the voice/fax channel is in use.

Host

The central computer (or computer systems) that provides primary data processing functions or data base access.

Hz, Hertz

A measure of frequency or bandwidth equal to one cycle per second.

Indicator lights

The light-emitting diodes (LEDs) on the front of the Multiserver 500.

GLOSSARY

Input level

A level of relative analog signal strength obtained from the attached telephone equipment.

Interrupted ring

A configuration option for the Multiserver 500 voice/fax channel fitted with an FXS interface module. When the channel is configured for interrupted ring, it rings the attached telephone set in a fixed cadence. See repeated ring.

Jumper

A miniature connector or wire that fits over, and electrically connects, two pins. A jumper either opens or shorts the electrical connection between the two pins.

Key telephone system

A telephone system in which the telephones have multiple pushbuttons to allow call out directly, without dialing an access number such as 9, and select incoming calls by pushing a button. Generally, a key telephone system has limited internal telephone-to-telephone capacity.

Link

A communications circuit or transmission path connecting two Multiserver 500s.

Loopback

A diagnostic feature used to test Multiserver 500s and related equipment either locally or from end to end over the link and back.

Maximum bandwidth

The amount of bandwidth allocated to the asynchronous data channel when the voice channel is not in use.

Maximum output level

A configuration option for an E&M 4-wire voice/fax channel. Allows for a maximum output level of +7 dBm.

NLP

Nonlinear processing, a method used to suppress residual echo.

Off-hook

A line condition caused when a telephone handset is removed from its cradle.

On-hook

A line condition that exists when a telephone handset is resting in its cradle.

PBX, private branch exchange

A privately owned phone system installed within the premises of an organization. It allows communication among users within the organization, as well as between those users and the outside world. It differs from a key telephone system, in that the user must dial an access number such as 9 to get an outside line.

Pulse dialing

Method used for call addressing in rotary telephones by short pulses of on-hook/off-hook. Also known as decadic pulsing in Europe.

Pulsed DC

A variation on the E&M signaling format, also known as Ron-Tron, used in France. A call connect request is made by sending a pulse of a medium duration on the transmit or “Tron” lead, and the call request is acknowledged by a return pulse of the same duration on the receive or “Ron” lead. See DC and AC-15.

RAM

Random access memory. A storage device into which data can be entered or read from.

Repeated ring

A configuration option for a Multiserver 500 voice/fax channel fitted with an FXS interface module. When so configured, causes the local

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