Page 3 - Contents
Contents Chapter 1 - Introduction ..................................................................................... 5 1.1 Introduction ............................................................................................. 61.2 About This Manual ...............................................
Page 5 - Chapter 1 - Introduction
Page 6 - Introduction
6 Chapter 1 - Introduction 1.1 Introduction The Multi-Tech Systems MultiDSU, model number MT56DSU-S is a synchronous 56 Kbps data service unit(DSU). As a combined DSU and Channel Service Unit (CSU), it provides a direct connection to theDATAPHONE ® Digital Service (DDS) network. The MT56DSU-S connec...
Page 7 - Description
7 Chapter 1 - Introduction 1.3 Description The MT56DSU-S is compact, easy to operate and has the features to allow flexibility in meeting yourtransmission requirements. The DDS is a service for transmission of digital signals via digital transmissionfacilities exclusively. The MT56DSU-S is designed ...
Page 8 - Features
8 Chapter 1 - Introduction 1.5 Features The MT56DSU-S provides many useful features. Standard features include V.35 and EIA-232-D interfaces onthe 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 pr...
Page 9 - Specifications
9 Chapter 1 - Introduction 1.6 Specifications Model Number: MT56DSU-S Device Operation: combined DSU and CSU Data Rates:Synchronous 56 Kbps (Data port and line) Interfaces: Data (RS232) DB25S (female) - Data port Data (V.35) DB25S (female) - Data port with an adapter cable Line (DDS) RJ-48 8-positio...
Page 10 - Panel Descriptions
Page 11 - Chapter 2 - Front & Back Panel Descriptions
11 Chapter 2 - Front & Back Panel Descriptions 2.1 Introduction This chapter describes the front panel LEDs and back panel connectors. The front panel has one row ofLEDs. Two back panel connectors provide the data and DDS or LADS connections. A circular powerconnector is provided to connect the ...
Page 12 - Back Panel
12 Chapter 2 - Front & Back Panel Descriptions 2.3 Back Panel All the cable connections, including one power connection and two signal connections, are made at the backpanel of the DSU. The RS232 connector is used to connect the DSU to an RS232 or V.35 device, and theLINE connector connects to a...
Page 13 - Switch Settings
13 Chapter 2 - Front & Back Panel Descriptions 2.4 Switch Settings An 8-position DIP switch is located on the right side of the MT56DSU-S printed circuit board (when viewedfrom the front, as in Figure 2-3). The DIP switch functions are described in the following table. 1 2 3 4 5 6 7 8 DIP-Switch...
Page 14 - Shunts
14 Chapter 2 - Front & Back Panel Descriptions 2.5 Shunts V.35 signal levels are more reliable for high speed data and/or longer cable distances. For higher speedsand/or longer distances, V.35 is preferred. EIA-232-D signal levels are intended for data rates of 19.2 Kbps orless and cable lengths...
Page 17 - Setup
17 Chapter 3 - Unpacking & Setup 3.4 Setup Perform the following procedure to connect your cables and, if necessary, change to V.35 signaling on thedata port. 1. If the DTE device has a V.35 interface, the internal shunt must be moved to the V.35 position and a V.35adapter cable must be connecte...
Page 19 - Chapter 4 - Diagnostics
Page 26 - Repairs; Repair Procedures for International Customers
26 Chapter 5 - Service & Warranty 5.2 Repairs 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 DriveMounds View, MN 55112Attn: Repair...
Page 27 - Repair Procedures for International Distributors; Technical Support; Internet Site
27 Chapter 5 - Service & Warranty Repairs for damages caused by lightning storms, water, power surges, incorrect installation, physical abuse,or user-caused damages are billed on a time-plus-materials basis. 5.2.3 Repair Procedures for International Distributors Procedures for International Dist...
Page 28 - Appendix
Page 29 - Appendix A - Application Examples; Local Area Data Set Application
29 Appendix Appendix A - Application Examples Introduction This section illustrates several types of applications in which the MT56DSU-S is typically used. These typesinclude: Local Area Data Set DDS point-to-point application DDS multipoint (polled) application Local Area Data Set Application...
Page 31 - Appendix B - Interface Signals and Connector Pinouts
31 Appendix Appendix B - Interface Signals and Connector Pinouts RJ-48 Connector Pin 1 Pin 8 Key As viewed from the rear Figure B-1. Connector DESCRIPTION This connector ties the MT56DSU-S to the DDS Network. The RJ-48 connector is keyed for proper insertionof a keyed RJ-48 plug. PIN IDENTIFICATION ...
Page 32 - DB25S Connector
32 Appendix DB25S Connector 13 12 11 10 9 8 7 6 5 4 3 2 1 25 24 23 22 21 20 19 18 17 16 15 14 Figure B-2. Connector DESCRIPTION This connector ties the MT56DSU-S to the DTE. The DB25S connector has the following pinoutconfiguration. PIN IDENTIFICATION Pin Description Signal 1 Chassis Ground 2 Transm...
Page 33 - DB25S Connector with V.35 Interface
33 Appendix DB25S Connector with V.35 Interface 13 12 11 10 9 8 7 6 5 4 3 2 1 25 24 23 22 21 20 19 18 17 16 15 14 Figure B-3. Connector DESCRIPTION The DB25 connector also ties the MT56DSU-S to a DTE with a V.35 interface. When a V.35 interface deviceis connected to a MT56DSU-S, the internal shunt h...
Page 36 - FCC Regulations for Telephone Line Interconnection
36 Appendix Appendix C - Regulatory Information FCC Regulations for Telephone Line Interconnection 1. This equipment complies with Part 68 of the FCC rules. On the outside surface of this equipment is alabel that contains, among other information, the FCC registration number and ringer equivalencenu...
Page 37 - Canadian Limitations Notice
37 Appendix Canadian Limitations Notice Notice: The ringer equivalence number (REN) assigned to each terminal device provides an indication of themaximum number of terminals allowed to be connected to a telephone interface. The termination of ainterface may consist of any combination of devices subj...
