Black Box MD885A-R3, 34336, MD885C-R2, MD885AE-R2 User Manual

CUSTOMER

SUPPORT

INFORMATION

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

AUGUST 1999

MD885A-R2 MD885A-R3

MD885AE-R2

MD885C-R2

Modem 34336

MODEM

34336

ENT

601745301 Rev. A

NOTE

All models include the modem, (1) leased line cable, (1) dialup phone cable and this user manual. The MD885A-R2, MD885AE-R2, and MD885A-R3 include a power supply. The MD885A-R3 also includes (1) 10-ft. RS-232 cable and (1) DB9 F to DB25 M adapter.

FCC Information

FEDERAL COMMUNICATIONS COMMISSION

AND

INDUSTRY CANADA

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 Industry Canada.

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 Industrie Canada.

TRADEMARKS USED IN THIS MANUAL

Hayes®is a registered trademark of Hayes Microcomputer Products, Inc.

Microcom Networking Protocol

and MNP®are registered trademarks of

Microcom Systems, Inc.

Any trademarks mentioned in this manual are acknowledged to be the property of the trademark owners.

Modem 34336

Table of Contents

1.0 Specifications .....................................................................................6

2.0 Quick Start ..........................................................................................8

2.1 Installation ..................................................................................8

2.1.1 Unpacking ................................................................................8

2.1.2 Package Contents......................................................................8

2.1.3 What You Will Need..................................................................8

2.1.4 Connections ..............................................................................8

2.1.5 Jumpers....................................................................................10

2.2 Front Panel LCD And Controls ..............................................11

2.2.1 Power-On Screen ...................................................................11

2.2.2 EIA Status Screen ...................................................................12

2.3 Quick Setup ..............................................................................13

2.4 Basic Operation .......................................................................16

2.4.1 2-Wire Dial (Hayes) Mode .....................................................16

2.4.2 2-Wire Dial (V.25 bis) Mode ..................................................18

2.4.3 2-Wire Dial (Dumb) Mode ....................................................19

2.4.4 Leased Line (2- or 4-Wire) Mode .........................................21

2.4.5 V.33 Leased Line Operation .................................................22

2.4.6 2-Wire Dial (Bell 208) Operation .........................................22

2.4.7 4-Wire Leased Line V.29 Mode ..............................................23

2.4.8 V.29 Fast Master and Slave Modes .........................................24

2.5 Problem Solving .......................................................................25

3.0 Modem Setup Options ..................................................................27

3.1 Methods For Selecting Options ..............................................27

3.2 Selecting Options From The Front Panel ..............................28

3.2.1 Pushbuttons And The LCD ...................................................28

3.2.2 How To Select Options...........................................................29

3.3 Options .....................................................................................32

Table of Contents

3.3.1 V.42 Error Correction Options .............................................35

3.3.2 Dialer Mode ...........................................................................41

3.3.3 Data Format Options .............................................................42

3.3.4 Disconnect Options ...............................................................43

3.3.5 Test Options ...........................................................................44

3.3.6 EIA Options ............................................................................44

3.3.7 Modem Setups .......................................................................46

3.3.8 V.33 and BELL 208A/B Options ..........................................49

3.3.9 Options Accessible With Summary Setup Only ...................50

4.0 General Operation and Special Features...................................54

4.1 Quick Reset ..............................................................................54

4.2 Phone Number Storage ...........................................................54

4.3 Leased Line Auto-Recovery .....................................................55

4.3.1 Autodial Backup .....................................................................57

4.3.2 Exit From Leased Line Auto-Recovery .................................57

4.3.3 Leased Line Auto-Recovery Options ....................................58

4.4 Dial Line Auto-Recovery ..........................................................58

4.4.1 Setting Up The Modem For Dial Line Auto-Recovery .........58

4.4.2 Recovery Procedure ...............................................................58

4.5 DTR Dialing .............................................................................60

4.5.1 Dialing A Stored Number ......................................................60

4.5.2 Answer Mode Operation .......................................................60

4.6 Dumb Mode And Bell 208 Operation ....................................60

4.7 Modem Security Operation .....................................................62

4.8 Modem-Controlled Remote Control .......................................66

4.8.1 Direct Modem-to-Modem Remote Control ..........................66

4.8.2 Remote Control through a Rack Controller .........................67

4.9 Diagnostic Interface Control ..................................................71

4.9.1 Diagnostic Port .......................................................................71

4.9.2 Diagnostic Port Commands ..................................................71

4.9.3 Responses To Diagnostic Port Commands ...........................73

4.9.4 DTE Displays ..........................................................................75

4.9.5 Disconnecting From A Diagnostic Link ...............................75

Modem 34336

4.10 Automatic Fallback ..................................................................76

4.10.1 Operating Mode Fallback ......................................................76

4.10.2 V.32 Speed Fallback ...............................................................78

4.11 V. 13 Operation ........................................................................80

5.0 Hayes Emulation Mode .................................................................81

5.1 Hayes Mode Autodialer ...........................................................81

5.1.1 Enabling The Hayes Mode Autodialer .................................81

5.1.2 Command Guidelines ............................................................81

5.1.3 Result Codes ...........................................................................84

5.1.4 Transmission Speed ...............................................................84

5.2 Hayes Compatible Commands ................................................84

5.3 S Registers ................................................................................90

5.3.1 Reading And Setting Registers ..............................................86

5.3.2 S Register Functions ..............................................................86

5.4 Selecting Options In Hayes Mode ..........................................94

5.4.1 Saving Option Selections .......................................................94

5.4.2 Profile 0 and Profile 1.............................................................94

5.5 Hayes Mode Reference Tables ................................................95

6.0 V.25 bis Autodialer .......................................................................107

6.1 Enabling The V.25 bis Autodialer .........................................107

6.2 V.25 bis Autodialer Commands ............................................108

6.3 Dialing Parameters ................................................................112

6.4 V.25 bis Result Codes .............................................................112

6.5 DTR Dialing In V.25 bis Mode ..............................................112

7.0 Diagnostics ......................................................................................113

7.1 When And Why To Test ........................................................113

7.2 Symptoms And Scope Of The Problem ...............................113

7.3 Physical Inspection ................................................................114

7.4 Overview Of Modem Diagnostics ..........................................114

7.5 How To Select And Activate Tests ........................................115

7.5.1 Front-Panel Control .............................................................115

7.5.2 Running Tests In Hayes Mode .............................................115

7.5.3 Remote Test Control ...........................................................115

Table of Conents

7.6 Diagnostic Monitoring: Status Screens .................................115

7.6.1 EIA Status Screen .................................................................115

7.6.2 Other Status Screens.............................................................116

7.7 Local Modem Diagnostics ......................................................118

7.7.1 Analog Loopback (ALB) Test .............................................118

7.7.2 Analog Loopback Self Test (ALBST) .................................119

7.7.3 Analog Loopback Self Test With Errors (ST/E) ...............120

7.7.4 External Analog Loopback (ALBX) Test ...........................121

7.7.5 External Analog Loopback Self Test (ALXST)...................123

7.7.6 Digital Loopback Test (DLB) .............................................124

7.8 Remote Modem Diagnostics......................................................126

7.8.1 Remote Digital Loopback (RDL) Test ...............................126

7.8.2 Remote Digital Loopback Self Test (RDLST) ....................127

Appendix A: DB25 Pin Assignments..........................................................129

Appendix B: Quick Setup Configurations .............................................130

Appendix C: Summary Setup .......................................................................135

Appendix D: Jumpers ......................................................................................144

Appendix E: LCD Flow Charts ....................................................................147

Modem 34336

1.0 Specifications

Available Configurations — Stand-alone or rack-mount Compatibility —

V.29 9600, 7200, 4800 V.32 terbo 19.2 or 16.8 kbps V.33 14.4 or 12.0 kbps V.32 bis 14.4, 12.0, 9.6, 7.2, or 4.8 kbps V.32 9.6 or 4.8 Kbps V.34+ 33.6, 31.2, 28.8, 26.4, 24, 21.6, 19.2,

16.8, 14.4, and 12 kbps, 9600, 7200, 4800, and 2400 bps

V.34 28.8, 26.4, 24, 21.6, 19.2, 16.8, 14.4,

and 12 Kbps, 9600, 7200, 4800, and

2400 bps V.22 bis 2.4 kbps, V.21 300 bps Bell 208A/B 4.8 kbps Bell 212A 1.2 kbps Bell 103 0 to 300 bps

Data Rates — Asynchronous: 300 to 19,200 bps

Synchronous: 600 to 19,200 bps

Data Format — Asynchronous: 9, 10, or 11 bits, serial, binary

Synchronous: Serial, binary

Operation — Full duplex over dialup or leased line

Simulated half duplex V.13 operation

Fallback — Data Rates: 16.8, 14.4, 12.0, 9.6, 7.2, 4.8,

2.4, 1.2, or 0.3 kbps

Operation: V.22 bis, V.22, V.21, or V.23

Supported DTE Speeds — 300 to 115,200 bps Modes — V.34+ 33.6, 31.2, 28.8, 26.4, 24, 21.6, 19.2, 16.8,

14.4, and 12 kbps, 9600, 7200, 4800, and 2400 bps; full duplex over 2-wire line (Trellis coded)

V.34 QAM at 28.8, 26.4, 24, 21.6, 19.2, 16.8,

14.4, and 12 kbps, 9600, 7200, 4800, and 2400 bps; full duplex over 2-wire line

(Trellis coded) V.34 Extended AT: 33.6 Kbps, TR-301 proposed V.32 terbo QAM at 19.2 and 16.8 Kbps; V.32bis

fallback at 14.4 Kbps and lower V.33 QAM Trellis coded at 14.4 and 12.0 Kbps V.32 bis QAM at 14.4, 12.0, 9.6, 7.2, and 4.8

V.32 Kbps; echo cancel, full duplex over

2-wire line (Trellis coded at 7.2 Kbps and

higher, or non-coded at 9.6 Kbps)

1.0 Specifications

V.29 QAM at 9600, 7200, and 4800 bps V.27 8-phase DPSK at 4800 and 2400 bps V.26 4-phase DPSK at 2400 and 1200 bps V.23 FSK at 1200/75 bps, full duplex V.22 bis: QAM at 2400 bps; bandsplit, full duplex V.22: DPSK at 1200 bps; bandsplit, full duplex V.21: PSK at 0 to 300 bps; bandsplit, full duplex

Autodialer — Automatic dialing using rotary pulses or tone

signaling; supports Hayes AT commands or V.25 bis commands

Answer Modes — Automatic and manual answer Equalization — Receiver: Automatic adaptive equalization

Transmitter: Selectable compromise equalization (4 types)

Line Requirement — Unconditioned Transmit Timing — Internal, external, or slaved to receive clock Transmit Level — Leased: Selectable, 0 to -15 dBm

Dial: Permissive or programmable

Interface — Terminal: RS-232C/D, CCITT V.24/V.28

Dialup Line: 8-pin RJ-45 modular connector with

A/A1 and MI/MIC control Leased Line: 6-pin RJ-11 modular connector Diagnostic: 8-pin RJ-45 modular connector

Carrier Detect Threshold — Leased line: -26, -33, or -43 dBm; selectable

Dial line: -34, 41, or -51 dBm; selectable

Test Capabilities — Analog loopback, analog loopback self-test,

self-test with errors, digital loopback, remote digital loo.pback self-test, external analog loopback (4-wire), external analog loopback self-test (4-wire); front-panel TIA/EIA or frontpanel Hayes control

AC Power — Stand-alone: 90-132 VAC, 60 Hz ±5%

Rackmount: 117/220 VAC

Power Consumption — 13 watts Heat Generation — 44 BTU/hr Ringer Equivalence — 0.7 B Environment — Ambient temp: 32 to 120°F (0 to 49°C)

Storage temp.: 20 to 180°F (-7 to 82°C) Relative humidity: 5 to 90% at 24°C (75°F)

non-condensing

Size (stand-alone unit) — 2.5"H x 9.7"W x 10.1"D (6.4 x 24.6 x 25.7 cm) Weight — Stand-alone: 4.1 lb (1.9 kg)

Rackmount: 2 lb. (0.9 kg)

Modem 34336

2.0 Quick Start

All information in this manual applies to both the stand-alone and rackmount versions of the Modem 34336.

UICKSETUPS FOR AQUICKSTART

The simplest and fastest way to set up the Modems for immediate use is to select one of the factory-preset Quick Setup configurations.

Quick Setups are explained in Section 2.3, following installation instructions (Section 2.1) and a brief introduction to the Modem’s front-panel display and controls (Section 2.2).

2.1 Installation

2.1.1 U

NPACKING

Many early modem failures are a result of damage done during shipping. Visually inspect your modem. Keep the original shipping carton in case you have to return the modem for any reason.

2.1.2 P

ACKAGECONTENTS

All models include the following cables:

• A two-conductor crossover cable for a dial-line connection.

• A four-conductor cable for a leased-line connection.

Both cables have an eight-pin modular connector (RJ-45) on one end and a six-pin modular connector (RJ-12) on the other end. You will need to use both of the supplied cables if you want to use the Modem for Leased-Line Auto Recovery, which requires both a leased-line and dial-line connection.

The MD885A-R2, MD885AE-R2, and MD885A-R3 include a power supply.

The MD885A-R3 package also includes additional cables:

• (1) 10-ft. RS-232 cable

• (1) DB9 F to DB25 M adapter

2.1.3 W

HATYOUWILLNEED

• You will need an EIA RS-232 interface cable (supplied with the MD885AR3, not supplied with the MD885A-R2, MD885AE-R2, or MD885C-R2) to connect the Modem to a DTE (data terminal equipment, usually a computer).

2.0 Quick Start

• If you are operating the Modem in a manual dial mode, you also need a standard telephone set.

2.1.4 C

ONNECTIONS

Figure 2-1 shows how the Modem is connected to the computer or terminal,

AC power supply, phone lines, and handset.

Do not install the modem more than 50 feet (15.2m) from the DTE (the EIA standard maximum length for interface cable). For DTE speeds greater than 19.2 Kbps, a shorter low-capacitance DTE interface cable should be used. Call technical support for information on which cable will support your application.

For all applications:

• Connect your RS-232 cable to the rear-panel DB25 connector labeled DTE. Connect the other end to your computer or other DTE.

• Attach the power transformer cable (included) to the rear-panel connector labeled POWER. Plug the other end into an AC outlet.

Figure 2-1. Modem 34336 Connections.

DTE

DIAG

DIALRXDIAL

LEASED

LINE

PHONE

POWER

DTE

AC outlet

Telephone

Dialup

Line

Leased

Line

RS-232

cable

Power

trans-

former

Modem 34336

For dialup applications:

• Use the supplied two-conductor crossover cable to connect the Modem to the telephone-line modular wall jack. Plug the eight-pin connector (RJ-45) of the cable into the rear-panel jack labeled TX DIAL. Then, plug the six-pin connector (RJ-12) into the telephone jack.

NOTE

Do not bundle the telephone and RS-232 cables together.

• Optional: For manual-dial operation, or if you want to use the telephone line for voice transmissions (when the Modem is not operating in data mode), connect a standard telephone into the rear-panel jack labeled PHONE.

For leased-line applications:

• Use the supplied four-conductor cable to connect the Modem to your leased-line modular wall jack. Attach the six-pin modular connector (RJ-12) to the rear-panel jack labeled LEASED LINE. Attach the eight-pin connecter (RJ-45) of the cable into the line’s terminal block.

The same cable is used whether you have a 4-wire or 2-wire leased line. In a 4-wire application, the green and red wires are the TRANSMIT pair, and the yellow and black wires are the RECEIVE pair. When the cable is connected to a 2-wire line, only the green and red wires are used.

NOTE

Do not bundle the telephone and RS-232 cables together.

2.1.5 J

UMPERS

For most applications, you will not need to reset internal jumpers. However, jumpers must be reset for the following situations:

• If you are connecting frame ground to signal ground.

• If you are switching from A/A1 control to MI/MIC control.

• Change the function of TIA/EIA pin 25 (the default is test mode indicator).

• If you use the Modem in a DC rack enclosure.

For detailed jumper information, see Appendix D.

2.0 Quick Start

2.2 Front-Panel LCD and Controls

To select a Quick Setup configuration, you will need to use the pushbuttons and liquid-crystal display (LCD) on the modem’s front panel. These features are shown in Figure 2-2. For a detailed explanation of the front panel controls, see Chapter 3.

2.2.1 P

OWER-ONSCREEN

When the Modem is powered on, the LCD momentarily displays the power-on screen. The top line identifies the modem type. The lower line indicates the software revision level.

NOTE

The software revision level of your modem may be different from the

number shown above.

The Modem spends about two seconds checking the ROM checksum and doing self-tests, and then displays the EIA status screen.

Figure 2-2. Front-Panel LCD and Controls.

LIQUID CRYSTAL DISPLAY (LCD)

PUSHBUTTONS

FRONT PANEL

2 3 ENT

123

V.34/33.6

Version 3.01

Modem 34336

2.2.2 EIA S

TATUSSCREEN

The EIA status screen indicates the operational status of the Modem as well as the condition of certain EIA RS-232 leads. The abbreviations that may appear are identified below. Typically, only a few of these abbreviations will be displayed during actual operation.

D = Dial line occupied.

R = Ringing (R appears in same position as D).

S = Connection secured by security handshake. (S appears in same

position as D. S and D may flash alternately).

TR = Data Terminal Ready.

MR = Data Set Ready.

RS = Request to Send.

CS = Clear to Send.

TD = Transmit Data.

14.4, 9600, 4800, etc. = Data speed in Kbps (thousand bits per second)

or bps (bits per second) (“idle” or H-01, H-14, etc. may also be displayed in the data speed position; see text below).

TM = Test mode.

ER = Error (poor signal quality).

CD = Carrier Detect.

RD = Receive Data.

Codes beginning with H (such as H-01) in the lower left corner of the status screen indicate that the Modem is handshaking with another modem (attempting to establish a connection).

When the modem is off-line, the word “idle” is displayed in the lower left corner of the status screen.

D TR MR RS CS

9600 CD

2.0 Quick Start

2.3 Quick Setup

To set up the Modem for immediate use (or to quickly change the modem’s configuration for an alternate mode of operation), select one of the factorypreset Quick Setup configurations (see Table 2-1). Your Modem will be ready for operation. You will not need to make further adjustments.

When you select a Quick Setup, the Modem uses internal memory to automatically set all of its options to the chosen configuration. All previously-stored option settings are overwritten. The Quick Setup does not affect telephone numbers stored in the modem’s memory.

You can customize a Quick Setup configuration by changing specific option settings (see 3.0 Modem Setup Options).

HOWTOS

ELECT

A Q

UICKSETUP

To activate a Quick Setup configuration, follow the steps below. As you do, you may find it helpful to refer to the LCD flow chart at the back of this manual.

1. Press the ENT (enter) pushbutton on the modem’s front panel. Screen 1 of the MAIN MENU is displayed:

2. Press pushbutton 2. Screen 1 of the QUICK SETUP menu appears:

3. Use the front-panel arrow pushbuttons to move through the QUICK

SETUP menu. There are 12 QUICK SETUP configurations. Each configuration is discussed in Table 2-1.

4. When the LCD shows the Quick Setup configuration you want, press pushbutton 2. The bottom line of the display will flash.

5. Press ENT. You will see SETUP screen 1. Press ENT a second time. The modem resets and the selected Quick Setup takes effect.

MAIN MENU <1>

TALK QUICK DIAL

QUICK SETUP <01>

2-W DIAL (Hayes)

Modem 34336

All options for each Quick Setup configuration are listed in Appendix B. If you want to customize your Quick Setup configuration, see 3.0, Modem Setup Options. For Hayes®mode options, see 5.0, Hayes Emulation Mode.

Table 2-1. Available Quick Setup Configurations.

QUICK SETUP IDENTIFIED ON LCD DESCRIPTION

QUICK SETUP <01> 2-WIRE DIAL HAYES EMULATION MODE— This 2-W DIAL (Hayes) dial mode (for use over ordinary phone lines) allows the

Modem to automatically dial (autodial) a previously stored phone number and respond to Hayes commands. This mode is compatible with communication software packages that use Hayes-style AT commands. The Hayes mode Quick Setup is the factory default configuration for the Modem.

QUICK SETUP <02> 2-WIRE DIAL V.25 bis MODE, V25 DIAL (Async) ASYNCHRONOUS—In V.25 bis mode, the Modem

operates in conformance with CCITT recommendation V.25 bis, allowing you to store and direct dial or autodial phone numbers from the DTE. Use Quick Setup 2 if the DTE connected to the modem is asynchronous.

QUICK SETUP <03> 2-WIRE DIAL V.25 bis MODE, SYNCHRONOUS- V25 DIAL (Syn_c) CHARACTER ORIENTED— Same as Quick Setup 2

except for data protocol. Use Quick Setup 3 if the DTE is synchronous-character oriented (bisynchronous).

QUICK SETUP <04> 2-WIRE DIAL V.25 bis MODE, V25 DIAL (Syn_b) SYNCHRONOUS BIT ORIENTED—Same as Quick

Setup 2 except for data protocol. Use Quick Setup 4 if the DTE is synchronous bit-oriented (SDLC/HDLC).

QUICK SETUP <05> 2-WIRE DIAL DUMB MODE—When the Modem is in

2-W DIAL (DUMB) Dumb mode, you can use it for dial-line answer-only

applications, dial a previously stored telephone number from the front panel, or dial telephone numbers via an external source (telephone).

QUICK SETUP <06> 2-WIRE LEASED-LINE ORIGINATE MODE— 2-W LEASED (ORG) In Leased-Line mode, the Modem connects to the leased

line and stands ready to send and receive data. Use Quick Setup 6 if the leased line is a 2-wire line and you want to configure the Modem as the originate modem.

2.0 Quick Start

Table 2-1 (continued). Available Quick Setup Configurations.

QUICK SETUP <07> 2-WIRE LEASED-LINE ANSWER MODE— 2-W LEASED (ANS) Same as Quick Setup 6 except for modem answer/ originate

status. Use Quick Setup 7 if the leased line is a 2-wire line and you want to configure the Modem as the answer modem.

QUICK SETUP <08> 4-WIRE LEASED LINE ORIGINATE MODE— 4-W LEASED (ORG) Same as Quick Setup 6 except for line type. Use Quick

Setup 8 if the leased line is a 4-wire line and you want to configure the Modem as the originate modem.

QUICK SETUP <09> 4-WIRE LEASED LINE ANSWER MODE— 4-W LEASED (ANS) Same as Quick Setup 6 except for line type and modem

answer/originate status. Use Quick Setup 9 if the leased line is a 4-wire line and you want to configure the Modem as the answer modem.

QUICK SETUP <10> V.33 LEASED LINE OPERATION— 4-WLL V.33 This Quick Setup configures the Modem for V.33

operation. This provides compatibility with V.33 modems.

QUICK SETUP <11> 2-WIRE DIAL BELL 208 OPERATION— 2-W DIAL (208) This Quick Setup configures the Modem for 2-wire dial

operation compatible with Bell standard 208B.

QUICK SETUP <12> 2-WIRE DIAL V.32/208 AUTO-DETECT MODE— 2-W DIAL V32/208 This Quick Setup configures the Modem to automatically

select V.32 bis (V.13) or Bell 208 operation, depending on the mode of the originating modem.

QUICK SETUP <13> 4-WIRE LEASED LINE V.29 MODE— This Quick Setup 4-WLL V.29 configures the modem for V.29 operation, for

compatibility with V.29 modems.

QUICK SETUP <14> V.29 FAST MASTER MODE— This Quick Setup con- V.29 FAST MASTER figures the modem for V.29 fast train master operation, for

use in a multidrop network where multiple remote (slave) modems share the master Modem as the host modem.

QUICK SETUP <15> V.29 FAST SLAVE MODE — This Quick Setup configures V.29 FAST SLAVE the modem for V.29 fast train slave operation, for use in a

multidrop network where multiple remote (slave) modems share the same host (master) modem.

Modem 34336

2.4 Basic Operation

This section provides basic information for each of the modem’s primary operating modes. If you encounter difficulty, refer to Section 2.5, Problem

Solving.

2.4.1 2-W

IREDIAL(HAYES

) M

ODE

UICKSETUP

Two-Wire Dial (Hayes) mode is the factory-default configuration for the Modem. Hayes mode operation and commands are explained in detail in 5.0,

Hayes Emulation Mode.

Dialing a Phone Number. To dial a telephone number in Hayes mode,

type the Hayes command AT D on your computer or terminal keyboard, followed by the number you want to call and <cr>. Example:

AT D 5551212 <cr>

Dashes or spaces may be included for clarity, but they are not necessary. The Modem ignores them.

A carriage return (<cr>) is required at the end of each command. On most keyboards, the carriage return (<cr>) key is labeled Enter or Return.

In response to the command line shown above, the Modem will dial the number 555-1212.

If you need an access code (such as 9) to dial out of your building, insert the access code and a comma in the dial string:

AT D 9,5551212 <cr>

The Modem pauses for 2 seconds at the comma. This allows the Modem to wait for a second dial tone (after the access code) before dialing the number.

2.0 Quick Start

Dialing Mode. The default dialing mode is tone dialing. To change to pulse dialing, insert a P after AT D:

AT DP

To change from pulse dialing to tone dialing, insert a T after AT D:

AT DT

The specified dialing mode remains active until the alternate mode is specified or the modem is reset.

Connected. When a phone number is successfully dialed, a CONNECT message appears on the computer screen and the LCD on the Modem displays a status screen similar to the one shown below.

TD and RD flash to indicate that the modem is transmitting and receiving data. The speed may be other than 9600 bps. The Modem automatically adjusts to the speed of the remote modem, provided the remote unit is a compatible modem.

Terminating a Call. To terminate a call, first enter the escape sequence, +++. When the OK response appears on the DTE screen, enter the command AT H. An alternate method is to drop the DTR signal from the DTE. If you are using a computer with a communication software program, follow the program’s instructions for initiating and terminating calls.

2.4.2 2-W

IREDIAL

(V.25

BIS

) M

ODE

UICKSETUPS

2, 3,

AND

The Modem supports three types of V.25 bis operation: asynchronous, character-oriented synchronous, or bit-oriented synchronous. There is a Quick Setup for each V.25 bis type.

D TR MR RS CS TD

9600 CD RD

Modem 34336

For V.25 bis operation, the Modem must be configured to use the same data protocol as the attached DTE. V.25 bis mode operation and commands are explained in detail in Chapter 6.0, V.25 bis Audodialer.

Asynchronous V.25 bis Operation.

The data format of the DTE should be set to 7 data bits with even parity and one stop bit. The default DTE interface rate is 38,400 bps in asynchronous mode.

V.25 bis commands can be entered from the DTE keyboard. Example:

CRN 5551234

In response to this command, the Modem sends a VAL result code back to the DTE (indicating that the command is accepted), dials the telephone number 555-1234, and then waits for an answer tone from the remote modem. If no carrier is detected within a given time (default is 45 seconds), the modem automatically releases the line and sends a CFI NT result code to the attached DTE.

Spaces entered in the command line for clarity are ignored: CRN 555 1212 has the same effect as CRN5551212.

When a phone number is successfully dialed, the EIA status screen on the Modem looks like the one shown below.

Synchronous V.25 bis Operation

The data format of the DTE should be set to 7 data bits with odd parity.

In synchronous applications, the V.25 bis commands can be used to facilitate computer-controlled operations.

Synchronous bit-oriented operation uses High-Level Data Link Control (HDLC) formatting.

Synchronous character-oriented operation uses synchronous start-of-text and end-of-text characters to frame messages. The start-of-text character is preceded by two synchronous (SY) characters.

D TR MR RS CS

9600 CD

2.0 Quick Start

2.4.3 2-W

IREDIAL(DUMB

) M

ODE

UICKSETUP

Dumb mode is used primarily for manual call origination, answer-only applications, and in conjunction with certain dial back security systems that utilize MI/MIC signals to place the modem on-line. (If you need to configure the modem for MI/MIC use, refer to Appendix D.) For additional information on Dumb-mode operation, refer to Chapter 4.0, General

Operation and Special Features.

Answering a Call Automatically. After the Quick Setup for 2-Wire Dial

(Dumb) mode is selected, the Modem will automatically answer incoming calls. The only other requirement is that either (1) the DTE must provide the DTR signal (TR on the LCD status screen) to the modem, or (2) DTR must be set to TRUE (using the modem’s DTR from EIA option screen).

Originating a Call from the Front Panel. Before you can originate a call from the front panel, you must store the number to be dialed in the modem.

From the Set-up <5> screen, access the PHONE screen by pressing the following pushbuttons in sequence:

Pushbutton 1 (Phone) Pushbutton 2 (Prog)

The abbreviations DEC, CTRL, and INC are displayed on the bottom line of the LCD, indicating that you located the PHONE screen.

Follow the steps below to store the phone number:

1. Use the right and left arrow pushbuttons to go to the digit you want to change. The cursor causes the character at that digit location to blink, indicating that the digit or character can be changed.

2. Use pushbutton 1 to decrease numbers, and pushbutton 3 to increase them.

3. Use pushbutton 2 (CTRL) to sequence through the dialing control characters (explained in Chapter 3).

4. Use the arrow pushbuttons to move on to the next digit or character you want to change. (The characters that can be stored are listed in Chapter 3.)

5. The phone number is saved when you return to the MAIN MENU. To return to the EIA status screen, press ENT three times.

Modem 34336

Autodialing the Stored Number. To autodial the stored number from the EIA status screen, press the following pushbuttons in sequence:

ENT Pushbutton 3 (to select DIAL from MAIN MENU screen 1) Pushbutton 1 (to select DIAL from the AUTO-DIAL screen)

When the local modem successfully establishes a connection with the remote unit, the EIA status screen should be present. This screen looks like the one shown below.

If the modem’s LCD displays an AUTO-DIAL FAILURE message, refer to Table 2-2.

Terminating a Data Call. Normal termination of a data call is processed through communication software. An alternate method is switching the HANGUP option on the AUTO-DIAL screen. Another method is to drop the DTR signal from the DTE (by software control or by turning the DTE off). For manual originate/answer operation, see Chapter 4.

2.4.4 L

EASEDLINE

(2- OR4-W

IRE

) M

ODE

UICKSETUPS

6, 7, 8,

AND

This section does not apply to V.33 leased line operation. For V.33 leased line operation, see the next section.

Table 2-2. Auto-Dial Failure Messages.

FAILURE MESSAGE EXPLANATION

LINE OCCUPIED The data line is already in use.

DIAL NOT ALLOWED Modem is not configured for dial

backup.

NO DTR DTR is not present.

NO LINE CURR Loss of line current.

D TR MR RS CS TD

9600 CD RD

2.0 Quick Start

The following information applies to both 2-wire and 4-wire leased-line operation:

• The modem must be configured for the correct line type –– 2-wire

or 4-wire. If you select the correct Leased Line Quick Setup, the line type is automatically set to the correct setting.

• One modem must be set to originate mode and the other to answer mode.

If you select the correct Leased Line Quick Setup, the answer/originate status is automatically set to the correct setting.

• Leased line operation is restricted to data rates of 4800 bps or higher.

• Lines can be conditioned or unconditioned.

After the appropriate Leased Line Quick Setup is selected, the answer unit immediately begins the training sequence. It is ready to handshake with the originate modem.

When the local modem establishes a connection with the remote unit, the EIA status screen should be present. This screen should look like the one shown below.

TR MR RS CS TD

9600 CD RD

Modem 34336

2.4.5 V.33 L

EASED-LINEOPERATION

UICKSETUP

10)

V.33 operation is available on the Modem at speeds of 12,000 and 14,400 bps. V.33 leased-line operation provides compatibility with V.33 modems (synchronous operation only).

A 4-wire line must be used (conditioned or unconditioned), and both connected modems must be set for V.33 operation.

After the V.33 Leased-Line Quick Setup is selected, the answer unit immediately begins the training sequence, meaning it is ready to handshake with the originate modem.

When the local modem successfully establishes a connection with the remote unit, the EIA status screen is present. This screen looks like the one shown below:

Three options are intended for V.33 (and Bell 208A/B) operation exclusively. These options are listed in Section 3.3.8.

2.4.6 2-W

IREDIAL(BELL

208) O

PERATION

UICKSETUPS

AND

12)

The Bell 208 Quick Setup, available on the Modem only, configures the modem for 2-wire dial synchronous operation compatible with Bell standard 208B. The data rate is fixed at 4800 bps, and the data format is set to synchronous. Both connected modems must be set for 208B operation. For additional information on Bell 208 operation, see Chapter 4.

Beginning with the section titled Answering a Call Automatically, all information in Section 2.4.3 also applies to Bell 208 operation.

Three options are intended for Bell 208 (and V.33) operation exclusively. These options are listed in Section 3.3.8.

TR MR RS CS TD

9600 CD RD

2.0 Quick Start

2.4.7 4-W

IRELEASEDLINE

V.29 M

ODE

UICKSETUP

13)

The 4-Wire Leased Line V.29 Mode configures the modem for V.29 operation, for compatibility with V.29 modems. Keep these guidelines in mind when using this mode:

• The modem must be configured for use with a 4-wire line.

• Operation is restricted to data rates of 4800, 7200, and 9600 bps.

• Lines can be conditioned or unconditioned.

After you select this Quick Setup mode, the modem will send a training sequence and wait for a training response from the remote modem. The modem will repeat the training sequence every 1.2 seconds until the remote modem responds.

When the local modem has established a connection with the remote unit, the TIE/EIA status screen will appear.

NOTE

For point-to-point 4-wire leased-line V.29 operation, the Auto-Retrain option should be enabled on both modems. (Auto-Retrain is enabled by default if you select the 4-wire Leased Line V.29 Quick Setup.) If the Auto-Retrain option is disabled, the modem will not transmit a training sequence and will instead train on the data stream from the remote modem. Disabling Auto-Retrain in 4-wire leased line V.29 mode is recommended for test purposes only. If Auto-Retrain is disabled, it should be disabled on both modems.

V.34/V.32 Dial Backup

NOTE

Dial backup can only be used in point-to-point applications.

To prevent service interruption in the event of poor leased line conditions, the modem can be configured for V.29 leased line operation with V.34/V.32 dial backup. This means the modem will use dial lines to automatically restore operation when conditions on the leased lines deteriorate. (Use V.34 or V.32 modulation for dial backup.) To set up the Modem for V.29 leased line operation with dial backup, follow these steps:

1) Select the 4-wire leased line V.29 (4-WLL V.29) Quick Setup on both the local and remote modem.

2) One modem must be set to originate mode and the other to answer mode. To make this selection, use the ANS/ORG DEFAULT screen on the front panel LCD.

3) Configure the modems for leased line auto-recovery.

Modem 34336

2.4.8 V.29 F

ASTMASTER ANDSLAVEMODES

UICKSETUPS

AND

15)

In multidrop operation, the master modem transmits to all of the slave (remote) modems. When the DTE at a slave site recognizes its own address in the polling protocol, it raises RTS to the slave transmitter. The slave responds by transmitting a special training sequence, then raising CTS and transmitting the data from the DTE. When the DTE has completed transmission, it lowers RTS and the modem will drop carrier to let the next modem on the poll list use the channel.

The V.29 Fast Master and Fast Slave modes support data rates of 4800, 7200, and 9600 bps. The leased lines can be conditioned or unconditioned. The master modem must be set to originate mode, and the slave modem must be set to answer the mode. (The Answer/Originate option is automatically set to these settings when the V.29 Fast Master and Fast Slave Quick Setups are used.)

Slave-to-Master (Inbound) Transmission

When the remote modems come on-line, they automatically synchronize to the incoming carrier and train on the data stream from the master modem. Slave-to-master transmission is always switched carrier operation under control of the RTS signal from the DTE. An anti-streaming timer built into the modem will (if enabled) halt transmission if the DTE holds RTS on for more than 30 seconds. The assumption is that if RTS is held on for more than 30 seconds, there is a fault in the DTE.

If you access the TIA/EIA status screen on the LCD display when a slave modem is transmitting to the master modem, the status screen will typically look like this:

TR MR RS CS TD

9600 CD RD

Typically TD, CD, and RD will flash on the master modem, and RS, CS, TD, and RD will flash on the slave modems.

2.0 Quick Start

2.5 Problem Solving

If you encounter difficulties in setting up or using the modem, try the remedies described below. If you suspect a system malfunction, follow the diagnostic procedures described in Chapter 7. If you cannot resolve the problem, call your supplier.

1. ALLM

ODES

Make sure all cables are properly connected to the back of the modem.

2. ALLD

IALMODES(HAYES

, V.25

BIS

, D

UMB

, B

ELL

208,

AND

V.32/208)

DTR (Data Terminal Ready) must be ON if you want to use the modem’s autodial or auto-answer features. (If DTR is ON, the TR indicator is present on the EIA status screen.)

3. ALLA

SYNCHRONOUSMODES

The modem’s default DTE speed is 38.4 Kbps in asynchronous mode. If the local DTE does not support this speed, change the modem’s DTE Speed option setting. In Hayes mode, the default DTE speed is automatically overridden when the Modem is autobauded (the Hayes mode AT attention code is sent to the Modem).

4. H

AYESMODE

In Hayes mode with default settings in effect, the Modem transmits result codes (messages) to the DTE. In some instances, this may cause undesirable interaction with the attached DTE. If such interaction occurs, use the AT Q2 command to suppress result codes for incoming calls.

5. ALLL

EASED-LINEMODES

(2-W

IRE

, 4-W

IRE, AND

V.33)

DTR (Data Terminal Ready) must be ON for the units to train on the leased line. (If DTR is ON, the TR indicator is present on the EIA status screen.)

Four types of compromise equalization are available to compensate for distortion. If the signal quality appears to be inadequate (see Quality Screen in Section 7.6.2), or if the modems are frequently retraining, try changing the equalization option. See Compromise Equalizers in Section 3.3.6.

6. L

EASED-LINE(EXCLUDING

V.33 O

PERATION

)

Make sure one modem is set to originate mode and that the other is set to answer mode. (If the correct Quick Setup is selected, and not incorrectly modified, the answer/originate status should be correct.)

Modem 34336

NOTE

This page is intentionally left blank.

3.0 Modem Setup Options

3.1 Methods For Selecting Options

The Modem allows you to easily select options for tailoring the modem’s operation to suit a particular application. You can be select options in the following ways:

• Quick Setup — the easiest way to set up the Modem. Quick Setup (explained in Chapter 2) automatically sets all options according to a preset configuration.

• Front-panel selection — the easiest and most commonly used method for selecting individual options. You can select an overall configuration via Quick Setup, and then change selected options from the front panel to suit your application. To make changes, access individual option screens on the front panel LCD. Make selections using the control pushbuttons.

• Summary Setup — the fastest way to selectively change options. All options are accessed using a few of the LCD screens. These screens show numerical codes with very little explanation. Therefore, Summary Setup is recommended for experienced users only. Summary Setup is explained in Appendix C.

Figure 3-1. LCD Pushbuttons.

TRANSMITTER

PATTERN

GENERATOR

RECEIVER

PATTERN

DETECTOR

Modem 34336

3.2 Selecting Options from the Front-Panel

3.2.1 P

USHBUTTONS AND THE

LCD

Options are selected from the front panel by pressing the front panel pushbuttons (Figure 3-1). The possible choices for each option are shown on the liquid crystal display (LCD) and on the flow chart at the back of this manual.

1. Arrow Pushbuttons. Use the left arrow and right arrow pushbuttons to display additional or previous pages (screens) of a menu. The right arrow pushbutton displays an additional menu page (if there is one); the left arrow pushbutton displays the previous page of a menu. With respect to how the LCD flow chart is set up, the arrow pushbuttons move you either right or left within the chart.

If the menu has more than one screen, each screen is numbered. This number appears in the upper right corner of the LCD display. If there is no page number, the menu has only one screen. Additional pages of a menu show additional option selections. In the example below, the screen number (or page number) is 2.

2. Numbered Pushbuttons. Pushbuttons 1, 2, and 3 correspond to segments 1, 2, and 3 of the LCD screen. These segments (left, middle and right positions of the LCD screen) are numbered on the modem’s front panel.

With respect to how the LCD flow chart is organized, pushbuttons 1, 2, and 3 either take you to a lower level or allow you to select an option when there is no route to a lower level.

3. ENT Pushbutton. To exit from a displayed screen, press the ENT pushbutton. With respect to how the LCD flow chart is set up, pushing ENT moves you upward through the chart (toward the MAIN MENU).

Pressing ENT repeatedly will return you to screen 1 of the MAIN MENU.

Pressing ENT repeatedly after arriving at the MAIN MENU screen 1 causes the LCD to alternate between the EIA status screen and the MAIN MENU.

In the case of most tests, ENT cannot be used to exit the test screen once the test is activated. To exit a test, first press ENT, and then select OFF to end the test.

MAIN MENU <2>

SETUP TEST RMT

3.0 Modem Setup Options

NOTE

If you have selected a Quick Setup or have changed certain options settings, pressing the ENT pushbutton to exit the SETUP menu will cause the modem to reset.

3.2.2 HOWTOS

ELECTOPTIONS

Options are configured from the SETUP menu.

To access the SETUP menu, press the right-arrow pushbutton at page 1 of the MAIN MENU. This will take you to page 2 of the MAIN MENU. Press push button 1 to select SETUP.

The SETUP menu has six screens. Use the arrow pushbuttons until the option you wish to configure is displayed on the bottom line of the LCD window. Select the option you wish to configure by pressing the pushbutton that corresponds to the number on the front panel.

When you select an option, the option flashes on the LCD. The option will not take effect until you leave the SETUP menu. Simply accessing an option screen does not change the option, so not hesitate to move through the various LCD screens in the SETUP menu.

Note the following points:

• Selected options do not become active until you leave the SETUP menu.

• Changing some options causes the modem to automatically reset.

• The options you select are automatically saved by the Modem when you leave the SETUP menu.

1. DEC/INC (Decrease/Increase) Screens. Several option screens show the abbreviations DEC and INC on the bottom line of the LCD display. The abbreviations mean the numerical value shown on the top line (e.g., a stored phone number) can be changed. Selecting DEC (pushbutton 1) decreases the value; selecting INC (pushbutton 3) increases it.

Front panel LCD

SETUP <1>

TYPE LINE SPEED

+ 120 hidden pages