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Multitech MultiDSU56K MT56DSU-R Owner's Manual

Rack mount multi-rate dsu
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MultiDSU56K
TM
Rack Mount Multi-Rate DSU
Model MT56DSU-R
Owner's Manual
82023101.p65
1
2/12/01, 2:52 PM

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Summary of Contents for Multitech MultiDSU56K MT56DSU-R

  • Page 1 All manuals and user guides at all-guides.com MultiDSU56K Rack Mount Multi-Rate DSU Model MT56DSU-R Owner's Manual 82023101.p65 2/12/01, 2:52 PM...
  • Page 2 All manuals and user guides at all-guides.com Owner’s Manual P/N 82023101, Rev. B Model No. MT56DSU-R This publication may not be reproduced, in whole or in part, without prior expressed written permission from Multi-Tech Systems, Inc. All rights reserved. Copyright © 1995, by Multi-Tech Systems, Inc. Multi-Tech Systems, Inc.

  • Page 3: Table Of Contents

    All manuals and user guides at all-guides.com Contents Chapter 1 - Introduction and Description Introduction ................6 About This Manual ..............6 Description ................7 CSU/DSU Basics ..............8 1.4.1 DSU Functions .............. 8 1.4.2 CSU Functions .............. 8 Features ..................9 FCC Regulations for Telephone Line Interconnection ..
  • Page 4 All manuals and user guides at all-guides.com 3.2.11 Normal/Diagnostics ............. 28 LED Indicators ................ 29 Functions ................. 29 3.4.1 Local Area Data Set Applications ......29 3.4.2 Off-Net Extension Applications ......... 30 Chapter 4 - Troubleshooting Introduction ................32 LED Indicators ................ 32 4.2.1 RCV Indicator ..............

  • Page 5: Chapter 1 - Introduction And Description

    All manuals and user guides at all-guides.com MultiDSU56K Chapter 1 - Introduction and Description 82023101.p65 2/12/01, 2:52 PM...

  • Page 6: Introduction

    All manuals and user guides at all-guides.com MT56DSU-R Owner's Manual 1.1 Introduction Congratulations! Your new MT56DSU-R is one of the finest DSU/ CSUs available today. As a combined CSU (Channel Service Unit) and DSU (Data Service Unit), it provides a direct connection to the DATAPHONE Digital Service (DDS) network.

  • Page 7: Description

    All manuals and user guides at all-guides.com Chapter 1 - Introduction and Description 1.3 Description The MT56DSU-R is a rack-mounted DSU/CSU that is easy to operate and has the features to allow flexibility in meeting your transmission requirements. The DDS is a service for transmission of digital signals via digital transmission facilities exclusively.

  • Page 8: Csu/Dsu Basics

    All manuals and user guides at all-guides.com MT56DSU-R Owner's Manual 1.4 CSU/DSU Basics A DSU (Data Service Unit) and a CSU (Channel Service Unit) are typically connected to provide the interface between a DTE (data terminal equipment) and the DDS (Digital Data Service) or other four-wire network.

  • Page 9: Features

    All manuals and user guides at all-guides.com Chapter 1 - Introduction and Description 1.5 Features The MT56DSU-R provides many useful features. Standard features include V.35 and RS232 connections and either synchronous and asynchronous transmission; synchronous at rates up to 56000 bps and asynchronous up to 19200 bps;...

  • Page 10: Fcc Regulations For Telephone Line Interconnection

    All manuals and user guides at all-guides.com MT56DSU-R Owner's Manual 1.6 FCC Regulations for Telephone Line Interconnection This equipment complies with Part 68 of the FCC rules. On the outside surface of the rack is a label that contains, among other information, the FCC registration number and ringer equivalence number (REN).
  • Page 11 All manuals and user guides at all-guides.com Chapter 1 - Introduction and Description No repairs are to be made by you. Repairs are to be made only by Multi-Tech Systems or its licensees. Unauthorized repairs void registration and warranty. This equipment cannot be connected to public coin service provided by the telephone company.

  • Page 12: Specifications

    All manuals and user guides at all-guides.com MT56DSU-R Owner's Manual 1.7 Specifications Model Number MT56DSU-R Device Operation combined DSU and CSU Data Rates Synchronous 2400, 4800, 9600, 19200, 56000 bps Asynchronous 2400, 4800, 9600, 19200 bps Interfaces RS232C, V.35, DDS Temperature 0 to 50 Humidity...
  • Page 13 All manuals and user guides at all-guides.com Chapter 1 - Introduction and Description Input Impedance 135 ohms Delay Times (in msecs.) RTS/CTS DCD on DCD off 2400 4800 9600 19200 56000 82023101.p65 2/12/01, 2:52 PM...
  • Page 14 All manuals and user guides at all-guides.com MT56DSU-R Owner's Manual 82023101.p65 2/12/01, 2:52 PM...

  • Page 15: Chapter 2 -Hardware Installation

    All manuals and user guides at all-guides.com MultiDSU56K Chapter 2 -Hardware Installation 82023101.p65 2/12/01, 2:52 PM...

  • Page 16: Introduction

    All manuals and user guides at all-guides.com MT56DSU-R Owner's Manual 2.1 Introduction This chapter provides the information needed to configure and install the MT56DSU-R in a Multi-Tech Systems CC216G modem rack. This manual assumes the reader is familiar with the function and operation of data communications equipment and is technically qualified to provide installation service.

  • Page 17: 12 -Position Dip Switch (# 1-12)

    All manuals and user guides at all-guides.com Chapter 2 - Hardware Installation 2.2.1 12 -Position DIP Switch (# 1-12) The 12-position DIP switch is used to set data rate, clocking, RTS control, DSR control, and Async/Sync operation, diagnostic modes (Loopback Test, Test Pattern ), Circuit Assurance, and System Status.

  • Page 18: Changing The Default Dip Switch Settings

    All manuals and user guides at all-guides.com MT56DSU-R Owner's Manual 2.3 Changing the Default DIP Switch Settings Use Table 2-1 to determine the DIP switch setting changes required for your MT56DSU-R to operate in your particular environment. You may want to record your switch setting changes for future reference (e.g., troubleshooting, equipment moves/changes, calling Tech Support).
  • Page 19 All manuals and user guides at all-guides.com Chapter 2 - Hardware Installation Table 2-1. MT56DSU-R Switch Settings (Cont'd) Switch Description Normal/Diagnostics Mode Up - normal operating mode * Down - Loopback Test enabled Up - normal operating mode * Down - Test Pattern enabled Link Status Options Up - Circuit Assurance disabled * Down - Circuit Assurance enabled...

  • Page 20: Installation Procedure

    All manuals and user guides at all-guides.com MT56DSU-R Owner's Manual 2.4 Installation Procedure After your CC216G modem rack has been installed in your computer cabinet or in a stand-alone cabinet of your choosing, the MT56DSU- R can be inserted into the rack. Refer to the Rack Mounted Modems Owner's Manual for rack installation procedures.
  • Page 21 All manuals and user guides at all-guides.com Chapter 2 - Hardware Installation Table 2-2. Installation (cont'd) To connect the DTE to the MT56DSU-R using a V.35 interface, connect the V.35 Interface Adapter cable (CADSUR35) supplied by Multi-Tech to the V.35 interface on the DTE and the other end to the DB25 connector on the back of the rack.
  • Page 22 All manuals and user guides at all-guides.com MT56DSU-R Owner's Manual 82023101.p65 2/12/01, 2:52 PM...

  • Page 23: Chapter 3 - Operation

    All manuals and user guides at all-guides.com MultiDSU56K Chapter 3 - Operation 82023101.p65 2/12/01, 2:52 PM...

  • Page 24: Introduction

    All manuals and user guides at all-guides.com MT56DSU-R Owner's Manual 3.1 Introduction This chapter provides information on the operating functions of the MT56DSU-R. During normal operation the MT56DSU-R requires no operator intervention. Many of the optional features of the MT56DSU-R are selected by setting a switch.

  • Page 25: Anti-Streaming

    All manuals and user guides at all-guides.com Chapter 3 - Operation 3.2.3 Anti-Streaming This option is typically enabled on remote DSUs using multi-point lines. When enabled, the anti-streaming feature prevents a streaming (“jammed”) DTE from affecting the communications from remote sites(in a multi-point circuit) that are operating properly. When Anti-Streaming is enabled, the MT56DSU-R will detect when the DTE device holds RTS (Request To Send) on for longer than 20 seconds.

  • Page 26: System Status

    All manuals and user guides at all-guides.com MT56DSU-R Owner's Manual 3.2.5 System Status With this option enabled, the MT56DSU-R conditions the DSR signal with additional parameters to provide added information to the connected DTE concerning the Ready status of the communications channel.

  • Page 27: Clocking

    All manuals and user guides at all-guides.com Chapter 3 - Operation 3.2.7 Clocking This option allows selection of the MT56DSU-R’s clocking (timing for synchronization) from one of three sources. These clocking sources are discussed below. Internal clocking enables the MT56DSU-R to accept timing from its internal timing oscillator.

  • Page 28: Dsr Forced On

    All manuals and user guides at all-guides.com MT56DSU-R Owner's Manual 3.2.9 DSR Forced On When this option is enabled, the MT56DSU-R forces the DSR signal on continuously regardless of the condition of the received DDS signal (OOS or Test). The permanent DSR signal is used to eliminate momentary link interruptions that may be interpreted by the DTE as a communications channel failure.

  • Page 29: Led Indicators

    All manuals and user guides at all-guides.com Chapter 3 - Operation 3.3 LED Indicators The front panel of the MT56DSU-R contains ten LED indicators that can help in troubleshooting network or device problems. Chapter 4 of this manual contains detailed information on the LED indicators. 3.4 Functions This section describes the two optional MT56DSU-R modes of operation.

  • Page 30: Off-Net Extension Applications

    All manuals and user guides at all-guides.com MT56DSU-R Owner's Manual Wire Gage Data Rate 19 AWG 22 AWG 24 AWG 26 AWG 2400 bps 22.0 15.0 12.0 9.5 miles 4800 bps 19.0 13.0 10.0 8.0 miles 9600 bps 15.0 10.0 5.5 miles 19200 bps 11.9...

  • Page 31: Chapter 4 - Troubleshooting

    All manuals and user guides at all-guides.com MultiDSU56K Chapter 4 - Troubleshooting 82023101.p65 2/12/01, 2:52 PM...

  • Page 32: Introduction

    All manuals and user guides at all-guides.com MT56DSU-R Owner's Manual 4.1 Introduction All of the indicators used in normal operation of the MT56DSU-R are labeled on the LED overlay on the rack door. Each LED is labeled, as explained below. The LEDs provide status and maintenance information on the MT56DSU-R, as well as the attached network and line.

  • Page 33: Rcv Indicator

    All manuals and user guides at all-guides.com Chapter 4 - Troubleshooting 4.2.1 RCV Indicator The RCV (Receive) LED lights when the MT56DSU-R receives data ( 0 or a space) from the network. This LED should appear to flash during normal data reception. 4.2.2 XMT Indicator The XMT (Transmit) LED lights to indicate the DTE is sending data...

  • Page 34: Rts Indicator

    All manuals and user guides at all-guides.com MT56DSU-R Owner's Manual 4.2.7 RTS Indicator The RTS LED lights when the RTS signal is received from the DTE. The DIP switch for RTS Forced On does not affect this indicator. Refer to Chapter 2 for switch settings. 4.2.8 NS Indicator The NS (No Signal) LED lights when no signal at all is received from...

  • Page 35: Diagnostic Tests

    All manuals and user guides at all-guides.com Chapter 4 - Troubleshooting 4.3 Diagnostic Tests The MT565SU-R is set to a default of Normal (non-diagnostic) mode at the factory. When diagnostics are to be run, change the DIP switches as described in Chapter 2 of this manual. When a failure occurs in the digital facility (telco equipment), the network will detect the failure and send a repetitive OOS signal sequence to your equipment.

  • Page 36: Digital Loopback Test

    All manuals and user guides at all-guides.com MT56DSU-R Owner's Manual 4.3.2 Digital Loopback Test This test allows you to test the local DTE, the local MT56DSU-R, the communications link, and the remote MT56DSU-R. Use the following steps to perform the Digital Loopback Test. Set DIP switch #9 on the remote MT56DSU-R to the down position.

  • Page 37: Digital Loopback With Test Pattern Test

    All manuals and user guides at all-guides.com Chapter 4 - Troubleshooting 4.3.3 Digital Loopback With Test Pattern Test This test allows you to test the local MT56DSU-R, the communications link, and the remote MT56DSU-R. Use the following steps to perform the Digital Loopback Test with the Pattern Test.

  • Page 38: Test Pattern Test

    All manuals and user guides at all-guides.com MT56DSU-R Owner's Manual 4.3.4 Test Pattern Test This test allows you to test the local MT56DSU-R, the communications link, and the remote MT56DSU-R. With this test enabled, the MT56DSU-R sends and detects a pre- defined 15-bit pseudo-random test pattern.

  • Page 39: Dsu Loopback Test

    All manuals and user guides at all-guides.com Chapter 4 - Troubleshooting 4.3.5 DSU Loopback Test This test lets you verify proper MT56DSU-R operation by matching a transmitted signal to the "looped-back" receive signal. Refer to Appendix B for cable description. Obtain a DSU Loopback cable (CADSURLB) from Multi-Tech, or assemble one.

  • Page 40: Dsu Back-To-Back Test

    All manuals and user guides at all-guides.com MT56DSU-R Owner's Manual 4.3.6 DSU Back-to-Back Test This test lets you connect two MT56DSU-Rs with a back-to-back cable to verify proper DSU operation. Using a DSU that is known to be operational, you can test a second DSU that is suspect. Obtain a DSU Back-to-Back cable (CADSURBB) from Multi- Tech, or assemble one.

  • Page 41: Chapter 5 - Warranty, Service And Tech Support

    All manuals and user guides at all-guides.com MultiDSU56K Chapter 5 - Warranty, Service and Tech Support 82023101.p65 2/12/01, 2:52 PM...

  • Page 42: Service

    All manuals and user guides at all-guides.com MT56DSU-R Owner's Manual 5.1 Service In the event service is required, equipment may be sent, freight prepaid, to our factory. Return shipping charges will be paid by Multi-Tech Systems. Include a description of the problem, a return shipping address, and a check or purchase order for out-of-warranty repairs.

  • Page 43: Tech Support And Bbs

    All manuals and user guides at all-guides.com Chapter 5 - Warranty, Service and Tech Support 5.3 Tech Support and BBS Multi-Tech has an excellent staff of tech-support personnel available to help you get the most out of your Multi-Tech product. If you have any questions about the operation of this unit, please call Tech- Support at 1-800-972-2439 in the U.S.
  • Page 44 All manuals and user guides at all-guides.com MT56DSU-R Owner's Manual 82023101.p65 2/12/01, 2:52 PM...

  • Page 45: Appendixes

    All manuals and user guides at all-guides.com MultiDSU56K Appendixes 82023101.p65 2/12/01, 2:52 PM...

  • Page 46: Appendix A - Application Examples

    All manuals and user guides at all-guides.com MT56DSU-R Owner's Manual Appendix A - Application Examples Introduction This section illustrates several types of applications in which the MT56DSU-R is typically used. These types include: • DDS point-to-point application, • DDS multi-point (polled) application, •...
  • Page 47 All manuals and user guides at all-guides.com Appendix A - Application Examples DDS Multi-Point (Polled) Application Since your Central Office (CO) equipment must include “Multi-point Junction Units” (MJUs) and other special arrangements for this type of service, you may need to coordinate efforts with your network service provider.
  • Page 48 All manuals and user guides at all-guides.com MT56DSU-R Owner's Manual Local Area Data Set Application In this application, two pairs of wires provide the connection between two MT56DSU-R devices. The two pairs can be up to the equivalent of 3 miles of 26 AWG wire at 56000 bps, or longer for subrate applications (see distances chart in section 3.4.1 of this manual).
  • Page 49 All manuals and user guides at all-guides.com Appendix A - Application Examples Analog Off-Net Extension Application In this application, the MT56DSU-R is used with conventional analog modems and lines to complete DDS circuits in an area where DDS is not available (Site #3 in the example below) , or where the customer requires an extension of the DDS circuit for a special application.

  • Page 50: Appendix B - Interface Signals And Connector Pinouts

    All manuals and user guides at all-guides.com MT56DSU-R Owner's Manual Appendix B - Interface Signals and Connector Pinouts RS232C DB9 CONNECTOR DESCRIPTION This connector ties the MT56DSU-R to the DDS Network. The DB9S connector has the following pinout configuration PIN IDENTIFICATION Description Destination Transmit Pair...
  • Page 51 All manuals and user guides at all-guides.com Appendix B - Interface Signals and Connector Pinouts RS232C DB25S CONNECTOR Transmitter Signal — Element Timing 9 — Test Voltage (+V) 8 — Carrier Detect (CD) 7 — Signal Ground (SG) 6 — Data Set Ready (DSR) 5 —...
  • Page 52 All manuals and user guides at all-guides.com MT56DSU-R Owner's Manual V.35 INTERFACE ADAPTER CABLE DESCRIPTION This adapter cable should be used when the MTDSU56-R is configured for V.35 DTE interface. You can order the V.35 Interface Adapter cable (CADSUR35) from Multi-Tech. This cable uses a 25- pin male connector at one end and a 34-pin Winchester female connector at the other end.
  • Page 53 All manuals and user guides at all-guides.com Appendix B - Interface Signals and Connector Pinouts LINE CABLE DESCRIPTION This cable lets you connect the MT56DSU-R to your DDS Network. You can order the Line cable (CA248) from Multi-Tech, or build one using the instructions below.
  • Page 54 All manuals and user guides at all-guides.com MT56DSU-R Owner's Manual LOOPBACK CABLE DESCRIPTION This cable lets you test the MT56DSU-R when a second DSU is not available. It tests the DSU by having the DSU generate a signal, then the cable “loops’” the signal back to the DSU for comparison to the original signal sent.
  • Page 55 All manuals and user guides at all-guides.com Appendix B - Interface Signals and Connector Pinouts BACK-TO-BACK CABLE DESCRIPTION This cable lets you test a suspect DSU by connecting it to a known good DSU. It tests the suspect DSU by connecting its Transmit signal to the good DSUs Receive circuits.
  • Page 56 All manuals and user guides at all-guides.com MT56DSU-R Owner's Manual 82023101.p65 2/12/01, 2:52 PM...

  • Page 57: Glossary

    All manuals and user guides at all-guides.com MultiDSU56K Glossary 82023101.p65 2/12/01, 2:52 PM...
  • Page 58 All manuals and user guides at all-guides.com MT56DSU-R Owner's Manual This section defines several of the terms used in this manual. For an overview of DSU basics, refer to section 1.8 of this manual. ALBO (Automatic Line Build Out) - part of “equalizer” circuitry used to compensate for various gauges and alterations of local loops.
  • Page 59 All manuals and user guides at all-guides.com Glossary Control station - the station on a DDS multipoint circuit that is nearest the host system and transmits data to each remote station and receives a single serial bit stream from the remote stations via the MJU.
  • Page 60 All manuals and user guides at all-guides.com MT56DSU-R Owner's Manual Elastic store - an option that causes the DSU to allow for timing phase drifts in non-DDS applications. Four-wire circuit - two twisted-pair circuits with each pair transmitting signals in the opposite direction. Jumper - a wire that connects two or more pins;...
  • Page 61 All manuals and user guides at all-guides.com Glossary Multipoint circuit - a type of DDS network that includes one control station, attached remote stations, and all channel, MJU and digital access lines for station interconnection. OCU (Office Channel unit) - a DSU/CSU located in the telco central office.
  • Page 62 All manuals and user guides at all-guides.com MT56DSU-R Owner's Manual Test pattern - a diagnostic test for sending , detecting and checking a pre-defined pattern of bits. Two-wire circuit - A circuit in which one channel (line) is used for communications in both directions.
  • Page 63 All manuals and user guides at all-guides.com Glossary 82023101.p65 2/12/01, 2:52 PM...
  • Page 64 All manuals and user guides at all-guides.com 82023101 82023101.p65 2/12/01, 2:52 PM...

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