Multitech MT56DSU-S User Manual

Multi-tech systems syncronous 56k bps data service unit user guide mt56dsu-s

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MT56DSU-S
Syncronous 56K bps
Data Service Unit

User Guide

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Summary of Contents for Multitech MT56DSU-S

  • Page 1: User Guide

    MT56DSU-S Syncronous 56K bps Data Service Unit User Guide...
  • Page 2 Multi-Tech Systems, Inc. to notify any person or organization of such revisions or changes. Revision Date Description 12/30/2003 Initial release of MT56DSU-S User Manual on CD. Trademarks MultiTech and the MultiTech logo are trademarks of Multi-Tech Systems, Inc. All other references are trademarks of their respective companies. Technical Support France support@multitech.fr India support@multitechindia.com U.K.
  • Page 3: Table Of Contents

    Chapter 1 - Introduction ... 5 1.4.1 DSU Functions ... 7 1.4.2 CSU Functions ... 7 Chapter 2 - Front & Back Panel Descriptions ... 10 2.3.1 POWER Connector ... 12 2.3.2 RS232 Connector ... 12 2.3.3 LINE Connector ... 12 Chapter 3 - Unpacking &...
  • Page 4 Chapter 5 - Service & Warranty ... 23 5.1.1 Warranty ... 24 5.1.2 U.S. and Canadian Customers ... 24 5.1.3 International Customers (outside U.S.A. and Canada) ... 25 5.1.4 International Distributors ... 25 5.2.1 Repair Procedures for U.S. and Canadian Customers ... 26 5.2.2 Repair Procedures for International Customers ...
  • Page 6: Chapter 1 - Introduction

    About This Manual Chapter 1 - Introduction contains an introduction to the MT56DSU-S product and its features and functions. Chapter 2 - Front and Rear Panel Descriptions provides front panel LED descriptions and rear panel connector descriptions, DIP-switch settings, and an RS232/V.35 shunt description.
  • Page 7: Dsu Functions

    As such, the MT56DSU-S provides all the functions required on the customer side of the network. You will find the MT56DSU-S easy to install, use and maintain. It is recommended that you read the entire manual early in your experience with the MT56DSU-S so you can appreciate all of the MT56DSU-S features and options.
  • Page 8 Features The MT56DSU-S provides many useful features. Standard features include V.35 and EIA-232-D interfaces on the data port (DTE device) and a synchronous rate of 56 Kbps on both the data port and trunk, and user- selectable clocking option. Your Multi-Tech DSU/CSU provides the following features: •...
  • Page 9: Specifications

    Transmit Level Output Impedance Receive Levels Input Impedance Delay Times (in secs.) MT56DSU-S combined DSU and CSU 56 Kbps (Data port and line) DB25S (female) - Data port DB25S (female) - Data port with an adapter cable RJ-48 8-position keyed jack - Line 115V AC, 50-60 Hz, 2 Watts 32 to 120°...
  • Page 11 Introduction This chapter describes the front panel LEDs and back panel connectors. The front panel has one row of LEDs. Two back panel connectors provide the data and DDS or LADS connections. A circular power connector is provided to connect the external power supply. Front Panel The front panel has five LEDs that provide the status of the line.
  • Page 12: Chapter 2 - Front & Back Panel Descriptions

    Chapter 2 - Front & Back Panel Descriptions Back Panel All the cable connections, including one power connection and two signal connections, are made at the back panel of the DSU. The RS232 connector is used to connect the DSU to an RS232 or V.35 device, and the LINE connector connects to a DDS or LADS (Local Area Data Set) circuit.
  • Page 13: Switch Settings

    Switch Settings An 8-position DIP switch is located on the right side of the MT56DSU-S printed circuit board (when viewed from the front, as in Figure 2-3). The DIP switch functions are described in the following table. Table 2-1. Switch Settings...
  • Page 14 Chapter 2 - Front & Back Panel Descriptions Shunts V.35 signal levels are more reliable for high speed data and/or longer cable distances. For higher speeds and/or longer distances, V.35 is preferred. EIA-232-D signal levels are intended for data rates of 19.2 Kbps or less and cable lengths of 50 feet or less.
  • Page 16: Chapter 3 - Unpacking & Setup

    Introduction This chapter describes the unpacking of the DSU, cable connections depending on whether EIA-232-D or ITU-T V.35 interface signaling is used on the data port, and how to configure the unit dependent on your site situation. Once the DSU is configured, then the data port can be connected to your data device. Unpacking The shipping box contains the DSU, power adapter, and a documentation CD with a User's Guide.
  • Page 17 Setup Perform the following procedure to connect your cables and, if necessary, change to V.35 signaling on the data port. If the DTE device has a V.35 interface, the internal shunt must be moved to the V.35 position and a V.35 adapter cable must be connected to the data connector (labeled “RS232”).
  • Page 18 V.35 Shunt Either EIA-232-D or ITU-T V.35 electrical signal interface can be selected on the Data connector. Units are shipped with EIA-232-D signal levels selected. Use the following procedure to select V.35. CAUTION : This procedure requires opening the unit. Like most products of this type, this product contains components that are sensitive to static and static discharge.
  • Page 20: Chapter 4 - Diagnostics

    Introduction The DSU is set to a default of Normal (non-diagnostic) mode at the factory. When diagnostics are to be run, change the Loopback DIP switch 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 21: Line Loopback Test

    4.1.2 Line Loopback Test This test enables you to test the local DTE, the local DSU, the communications link, and the remote DSU. Use the following steps to perform the Trunk Loopback Test. Set DIP switch #3 on the remote DSU to the down position. Send data from the local DTE, it should be looped back to the local DTE.
  • Page 22: Dsu Back-To-Back Test

    4.1.4 DSU Back-to-Back Test This test lets you connect two DSUs 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 (#45050000) from Multi-Tech, or assemble one. Refer to Appendix B for instructions on building the Back-to-Back cable.
  • Page 24: Chapter 5 - Service & Warranty

    5.1.1 Warranty Multi-Tech Systems, Inc., (hereafter “MTS”) warrants that its products will be free from defects in material or workmanship for a period of two, five, or ten years (depending on model) from date of purchase, or if proof of purchase is not provided, two, five, or ten years (depending on model) from date of shipment.
  • Page 25: International Customers (Outside U.s.a. And Canada)

    Chapter 5 - Service & Warranty 5.1.3 International Customers (outside U.S.A. and Canada) Your original point of purchase reseller may offer the quickest and most economical repair option for your Multi-Tech product. You may also contact any Multi-Tech sales office for information about the nearest distributor or other repair service for your Multi-Tech product: www.multitech.com.
  • Page 26: Repair Procedures For U.s. And Canadian Customers

    5.2.1 Repair Procedures for U.S. and Canadian Customers In the event that service is required, products may be shipped, freight prepaid, to our Mounds View, Minnesota factory: Multi-Tech Systems, Inc. 2205 Woodale Drive Mounds View, MN 55112 Attn: Repairs, Serial # ____________ A Returned Materials Authorization (RMA) is not required.
  • Page 27: Repair Procedures For International Distributors

    Internet: http://www.thesupplynet.com Technical Support Multi-Tech Systems has an excellent staff of technical 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 800 972- 2439 (USA and Canada) or 763 785-3500 (international and local).
  • Page 29: Appendix

    The figure below depicts a typical Local Area Data Set application. DDS Point-To-Point Application In this application, the MT56DSU-S provides the interface between the DDS line and the DTE at your site. Your network provider will provide (at your request) a DDS line connecting the desired locations. The figure below depicts a sample DDS Point-to-point application.
  • Page 30: Dds Multipoint (Polled) Application

    The MT56DSU-S at the host end is the Master Station (also called the “Control Station”), which typically has RTS forced on. The attached MT56DSU-Ss are called “Remote stations” and have RTS controlled by the DTE.
  • Page 31: Connector

    Appendix B - Interface Signals and Connector Pinouts RJ-48 Connector DESCRIPTION This connector ties the MT56DSU-S to the DDS Network. The RJ-48 connector is keyed for proper insertion of a keyed RJ-48 plug. PIN IDENTIFICATION Description Transmit Pair Transmit pair...
  • Page 32: Db25S Connector

    DB25S Connector DESCRIPTION This connector ties the MT56DSU-S to the DTE. The DB25S connector has the following pinout configuration. PIN IDENTIFICATION Description Chassis Ground Transmit Data Received Data Request To Send Clear To Send Data Set Ready Signal Ground Carrier Detect...
  • Page 33: Db25S Connector With V.35 Interface

    The DB25 connector also ties the MT56DSU-S to a DTE with a V.35 interface. When a V.35 interface device is connected to a MT56DSU-S, the internal shunt has to be moved to the V.35 position. The V.35 interface for the DB25 connector has the following pinout configuration.
  • Page 34: Loopback Cable (Mts P/N 45640100)

    Loopback Cable (MTS P/N 45640100) DESCRIPTION This cable lets you test the MT56DSU-S when a second DSU is not available. When the DSU generates a signal, this cable “loops” the signal back to the DSU for comparison to the original signal sent. You can order this cable (#45640100) from Multi-Tech, or build one using the instructions below.
  • Page 35: Back-To-Back Cable (Mts P/N 45050000)

    Back-To-Back Cable (MTS P/N 45050000) 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 Receive circuits of the good DSU. You can order this cable from Multi- Tech (#45050000), or build one using the instructions below.
  • Page 36: Fcc Regulations For Telephone Line Interconnection

    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.
  • Page 37: Canadian Limitations Notice

    Appendix Canadian Limitations Notice Notice: The ringer equivalence number (REN) assigned to each terminal device provides an indication of the maximum number of terminals allowed to be connected to a telephone interface. The termination of a interface may consist of any combination of devices subject only to the requirement that the sum of the ringer equivalence numbers of all the devices does not exceed 5.
  • Page 38 S000327A...

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