Multitech MMH900 Bedienungsanleitung

MMH900 Series Statistical

Multiplexer

User Guide

S000315A Revision A

MultiMux (#MMH904Ca) (#MMH908Ca)

This publication may not be reproduced, in whole or in part, without prior

expressed written permission from Multi-Tech Systems, Inc. All rights

reserved.

Multi-Tech Systems, Inc. makes no representations or warranties with

respect to the contents hereof and specifically disclaims any implied

warranties of merchantability or fitness for any particular purpose.

Furthermore, Multi-Tech Systems, Inc. reserves the right to revise this

publication and to make changes from time to time in the content hereof

without obligation of Multi-Tech Systems, Inc. to notify any person or

organization of such revisions or changes.

Record of Revisions

Revision Date Description

A 11/01/03 Initial release of MultiMux MMH904/908C for

publication on CD.

TRADEMARK

Trademark of Multi-Tech Systems, Inc. are as follows: MultiMux,

MultiModem and the Multi-Tech logo.

Multi-Tech Systems, Inc.

2205 Woodale Drive

Mounds View, Minnesota 55112

(763) 785-3500 or (800) 328-9717

Fax (763) 785-9874

Tech Support (800) 972-2439

Internet Address: http://www.multitech.com

Contents

Chapter 1 - Introduction & Description ................................ 8

1.1 Introduction.................................................................................... 9

1.2 About This Manual......................................................................... 9

1.3 Background ................................................................................... 11

1.3.1 Description of Statistical Multiplexing ................................... 12

1.3.1.1 StatisticalMultiplexing .......................................................... 12

1.4 Product Description ....................................................................... 14

1.5 System Features ........................................................................... 17

1.5.1 Response Time Control........................................................ 17

1.5.2 Dynamic Buffering ................................................................ 17

1.5.3 Flow Control ......................................................................... 18

1.5.4 Diagnostics .......................................................................... 18

1.5.5 Downline Parameter Loading ............................................... 18

1.5.6 Operational Statistics andAuto-Reporting............................ 19

1.5.7 Parameter Memory .............................................................. 19

1.5.8 Channel Flexibility ................................................................ 19

1.5.9 Command Modem................................................................ 19

1.5.10 Composite Link .................................................................... 20

1.6 FCC Regulations for Telephone Line Interconnection ................... 21

1.7 DOC Terminal Equipment .............................................................. 23

1.8 Specifications ................................................................................ 24

1.8.1 Channels .............................................................................. 24

1.8.2 System Control..................................................................... 24

1.8.3 Composite LInk .................................................................... 25

1.8.4 33,600 bps Link Modem ....................................................... 25

1.8.5 56,000 bps DSU.................................................................. 25

1.8.6 ISDN TerminalAdapter......................................................... 26

1.8.7 Command Modem................................................................ 26

1.8.8 Electrical/Physical ................................................................ 26

Chapter 2 - Configuration ..................................................... 27

2.1 Introduction.................................................................................... 28

2.2 Configuration 1 .............................................................................. 29

2.3 Configuration 2 .............................................................................. 31

2.4 Configuration 3 .............................................................................. 32

Chapter 3 - Front & Rear Panel Descriptions..................... 34

3.1 Introduction.................................................................................... 35

3.2 Front Panel .................................................................................... 35

3.3 LED Indicators .............................................................................. 36

3.4 Back Panel .................................................................................... 40

3.4.1 ON/OFF Switch .................................................................... 40

3.4.2 Power Connector ................................................................. 40

3.4.3 COMMAND MODEM DIAL-UP Connector .......................... 40

3.4.4 COMMAND PORT Connector .............................................. 40

3.4.5 COMPOSITE LINK INTERNAL MODEM DIAL-UP Connector40

3.4.6 COMPOSITE LINK INTERNAL MODEM LEASED Connector41

3.4.7 COMPOSITE LINK INTERNAL DIGITAL DSU Connector.... 41

3.4.8 COMPOSITE LINK EXTERNAL RS232C/V.35 Connector ... 41

3.4.9 CHANNEL 1 - CHANNEL 8 Connectors............................... 41

3.5 Switches/Jumper/Shunt................................................................. 42

3.5.1 8-Position DIP Switch........................................................... 42

3.5.2 4-Position DIP Switch........................................................... 43

3.5.3 144RKWL/OtherJumper ....................................................... 44

3.5.4 V.24/V.35 Shunt.................................................................... 44

3.5.5 V.29/V.33 Shunt and 2834 Shunt.......................................... 44

Chapter 4- Installation........................................................... 45

4.1 Introduction.................................................................................... 46

4.2 Safety Warnings ............................................................................ 46

4.3 Unpacking...................................................................................... 46

4.4 Installation ..................................................................................... 47

Chapter 5 - Commands ......................................................... 52

5.1 Introduction.................................................................................... 53

5.2 Command Description ................................................................... 58

5.2.1 General Commands ............................................................. 58

5.2.2 Channel Parameter Commands ........................................... 65

5.2.3 Composite Link Commands ................................................. 74

5.2.4 Composite Link Format Commands ..................................... 78

5.2.5 Internal 9600/14.4K Composite Link Modem Commands..... 81

5.2.6 Internal MMH2834 Modem Configuration Commands.......... 84

5.2.7 Internal Composite Link DSU Commands ............................ 86

5.2.8 Test Commands ................................................................... 87

5.2.9 Command Modem commands ............................................. 89

Chapter 6- Operating Procedures ....................................... 90

6.1 Introduction.................................................................................... 91

6.2 MultiMux Operating Procedures .................................................... 91

6.3 Command Modem Operating Procedures ..................................... 95

Chapter 7 - Troubleshooting ................................................ 97

7.1 Introduction.................................................................................... 98

7.2 Importance of Composite Statistics ............................................... 98

7.3 Test Cables.................................................................................... 99

7.4 Troubleshooting Guide .................................................................. 101

7.5 Channel Device Testing ................................................................. 107

7.6 Local Modem and Communications Line Testing .......................... 108

7.7 MultiMux Functional Testing Procedures ....................................... 110

Chapter 8- Service, Warranty, & Technical Support ......... 112

8.1 Introduction.................................................................................... 113

8.2 Warranty ........................................................................................ 113

8.3 Repair Procedures for U.S. and Canadian Customers.................. 114

8.4 Repair Procedures for International Customers (Outside U.S.A. and

Canada) ............................................................................................ 115

8.5 Repair Procedures for International Distributors............................ 116

8.6 Online Warranty Registration......................................................... 116

Appendices.......................................................................... 117

AppendixA .............................................................................................. 118

Ascii Character Code/Hex/Decimal Conversion Chart ...................... 118

Appendix B

RS232C Interface Specification ........................................................ 119

Appendix C.............................................................................................. 121

Cabling Diagrams.............................................................................. 121

Appendix D.............................................................................................. 125

Command Modem Commands ......................................................... 125

Appendix E Command Modem S-Register Function.............................. 138

Appendix F .............................................................................................. 143

Flow Control Background.................................................................. 143

Appendix G ............................................................................................. 146

MMH2834 S-Registers...................................................................... 146

Appendix H.............................................................................................. 149

Dial Back-up...................................................................................... 149

Appendix I ............................................................................................... 150

Testing Your MMH2834 ..................................................................... 150

I.1 Introduction ................................................................................ 150

I.2 LocalAnalog Loopback Test/V.54 Loop 3 .................................. 151

I.3 Digital Loopback Test/V.54 Loop 2 (Loc/Man)...................... 152

I.4 Digital Loopback Test/V.54 Loop (Rem/Auto) ............................ 154

I.5 Synchronous Mode Testing ................................................. 156

I.6 Local Analog Loopback Test (Sync Mode)........................... 157

I.7 Digital Loopback Test (Loc/Man) Sync Mode ...................... 158

I.8 Digital Loopback Test (Rem/Auto)(Sync Mode)................... 159

Appendix J - Internal MMH2834 Composite Link Modem Commands.... 160

J.1.1 DialingAction Commands ........................................................ 163

J.1.2 Dial Modifier Commands ...................................................... 165

J.1.3 Phone Number Memory Commands .................................... 168

J.1.4 Configuration and Default Storage Commands .................... 170

J.1.5 Command Response (Result Code) Commands..................... 172

J.1.6 Phone Line Conditioning Commands ...................................... 176

J.1.7 RS232C Interface Control Commands ..................................... 177

J.1.8 Error Correction Commands ................................................ 178

J.1.9 Compression and Maximum Block Size Commands ............ 180

J.1.10 Speed Conversion Commands............................................. 181

J.1.11 ImmediateAction Commands............................................... 183

Glossary............................................................................... 185

Index..................................................................................... 195

Chapter 1 - Introduction &

Description

Chapter 1 - Introduction & Description

1.1 Introduction

Congratulations! Your new MultiMux MMH900 series is one of the finest

statistical multiplexers on the market today. The MultiMux is completely

software driven and is controlled by you through its command port. This

gives you great flexibility and ease of operation. This Owner’s Manual

will help you to install and use your MultiMux, and also provide you with

a valuable information resource in the future.

DTR

Statistical Multiplexer

IT 123

BUFFER

FULLNESS

LEVEL

MultiMux

Internal Composite Link

MMH2834 CD RCV XMT CTS 28.8 24.0 19.2 14.4 OH TR EC DBUP

DSU CD RCV XMT CTS 56 19.2 RTS NS OOS TM

V29/V33 CD RCV XMT CTS

External Composite Link

Channel Two Channel Three Channel Four

Command Modem

Channel Five

Channel Six Channel Seven Channel Eight

XMTRCV XMTRCV XMTRCV

RCV

Channel one

RCV XMT

CD RCV XMT CTS V.35

XMTRCV

XMT RCV XMTXMTRCV

XMT

RCV

INTERNAL LINK DEVICE

(Modems)

Systems

MultiTech

ISDN

Figure 1-1. MultiMux MMH900 Series

1.2 About This Manual

eThis manual is comprised of eight chapters. There are also several

appendices at the end of the manual, most of which is a condensed

version of the information contained in the chapters. These appendices

can be used as a quick reference. The information contained in each

chapter is as follows:

Chapter 1 - Introduction

This chapter is an introduction to the world of multiplexing. Since you

have already acquired the MultiMux, you may have an extensive

background in multiplexing. In which case, this introduction will provide a

good review.

Chapter 2 - Configuration

This chapter defines the configurations of the MMH900 series and

provides some typical examples of how the MultiMux is configured. The

MMH900 series is available in two models; the four and eight channel

units with an internal command modem, various composite link modems

supporting synchronous or asynchronous communications. The typical

examples explain how the MultiMux can be used in various

environments.

Chapter 1 - Introduction & Description

Chapter 3 - Front and Rear Panel Descriptions

Chapter 3 describes the front panel indicators, the switches and jumpers

within the cabinet and the rear panel connections. The front panel

indicators are described in the various groups depending on the

configuration of the MultiMux. Indicator groups are active depending on

how the MultiMux is used. The front panel is the same for all models

and contains some indicators for future enhancements. The back panel

provides all the cable connections for the early released models with the

addition of cable connections for future releases.

Chapter 4 - Installation

Chapter 4 provides the procedures for unpacking, installing and cabling

your MultiMux.After your MultiMux is cabled, an initial power on

procedure is provided for you to display and modify the channel and link

parameters to fit your configuration.

Chapter 5 - Commands

The MultiMux is software-driven and controlled through its command port

and the supervisory console. This chapter describes theAT commands

and the impact each has on your system’s operation.

Chapter 6 - Operating Procedures

Chapter 6 provides the operational information for your MultiMux. The

MultiMux operating procedures address the channel and composite link

parameters. The command modem operating procedures address the

command modem access, dialing, and remote access procedures.

Chapter 7 - Troubleshooting Procedures

This chapter is a guide to troubleshooting your MultiMux. It contains a

listing of error conditions, probable causes and suggested fixes or steps

designed to isolate the failing unit in your communications network.

Chapter 8- Service, Warranty and Tech Support

Chapter 8 provides instructions on getting service for the MultiMux at the

factory, a statement of the limited warranty, information about our user

bulletin board service, and space for recording information about your

multiplexer prior to calling Multi-Tech's Technical Support.

Chapter 1 - Introduction & Description

1.3 Background

Any data communications environment that has more than one

asynchronous line going between common locations can probably

benefit by installing a pair of statistical multiplexers (stat muxes). A stat

mux performs the function of combining several asynchronous data

communication channels into one composite signal that can be

transmitted between two locations more inexpensively than the cost of

the individual lines.

Figure 1-2 shows a simple communications network. Individual users

connect to asynchronous channels and the composite (or aggregate)

communications line between the two locations is the "link". Link

protocol is the communications discipline used between the two

multiplexers and typically operates at a speed higher than the individual

asynchronous units connected to each multiplexer.

Figure 1-2. Simple Communications Network

One reason that a stat mux works is that typically an asynchronous

terminal device is not used to its capacity. Studies show that as little as

10 to 15% utilization of such lines is a common occurrence. These

percentages indicate that the most efficient combination of lines in a

muxed asynchronous environment is between four and eight lines.

Although the primary reason for installing a mux is to save on

communications costs, two other benefits are also present. One is the

inherent error correction existing in muxed data and the other is data

security. Since a mux functions by taking individual asynchronous data

and transmitting it as data packets, there is an error detection and

retransmission scheme built in. Error correction is so vital in many

transmission types, such as graphic data and program transmission, that

many muxes are used mainly for their error correction capabilities.

The other benefit is data security which is achieved by the fact that the

individual data streams are encrypted into a single communication line

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