MT56DSU-S Syncronous 56K bps Data Service Unit User Guide
MT56DSU-S User Guide PN: S000327A Copyright ©2003 by Multi-Tech Systems, Inc. All rights reserved. This publication may not be reproduced, in whole or in part, without prior written permission from MultiTech Systems, Inc. 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.
Contents Chapter 1.1 1.2 1.3 1.4 1 - Introduction ..................................................................................... 5 Introduction ............................................................................................. 6 About This Manual .................................................................................. 6 Description ............................................................................................. 7 CSU/DSU Basics ......................................
Chapter 5 - Service & Warranty ....................................................................... 23 5.1 Multi-Tech Systems, Inc. Warranty & Repairs Policies ......................... 24 5.1.1 5.1.2 5.1.3 5.1.4 5.2 Repairs ................................................................................................. 26 5.2.1 5.2.2 5.2.3 5.2.4 5.3 5.4 Warranty ............................................................................................. 24 U.S. and Canadian Customers .............
Chapter 1 - Introduction
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 the DATAPHONE® Digital Service (DDS) network. The MT56DSU-S connects a synchronous Data Terminal Equipment (DTE) device to remote equipment using DDS network lines at 56 Kbps speeds for point-to-point and multi-point service. Figure 1-1. MultiDSU Modem 1.
Chapter 1 - Introduction 1.3 Description The MT56DSU-S is compact, 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. The MT56DSU-S is designed to meet AT&T Technical Publication 62310 requirements. As such, the MT56DSU-S provides all the functions required on the customer side of the network.
Chapter 1 - Introduction 1.5 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 userselectable clocking option. Your Multi-Tech DSU/CSU provides the following features: Supports direct connection to the DATAPHONE Digital Data Service (DDS) or compatible network Standard EIA-232-D and V.
Chapter 1 - Introduction 1.6 Specifications Model Number: Device Operation: Data Rates: Synchronous Interfaces: Data (RS232) Data (V.35) Line (DDS) Power Requirements: Temperature: Humidity: Dimensions: Weight: Certification: Compatibility: FIC Codes: USOC Jack: Transmitter/Receiver: Modulation Transmit Level Output Impedance Receive Levels Input Impedance Delay Times (in secs.
Chapter 2 - Front & Back Panel Descriptions
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 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. 2.2 Front Panel The front panel has five LEDs that provide the status of the line. The V35 LED lights if V.35 interface signaling is used.
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 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. The cable connections are shown in Figure 2-2 and defined in the following sections. POWER RS232 LINE Figure 2-2. Back Panel 2.3.
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 viewed from 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 Figure 2-3. Switch Settings Table 2-1.
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 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. There are two shunt positions in the middle left side of the printed circuit board that configure the data port for either RS232 or V.35 operation. The shunt positions are shown in Figure 2-3.
Chapter 3 - Unpacking & Setup
Chapter 3 - Unpacking & Setup 3.1 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. 3.2 Unpacking The shipping box contains the DSU, power adapter, and a documentation CD with a User's Guide.
Chapter 3 - Unpacking & Setup 3.4 Setup Perform the following procedure to connect your cables and, if necessary, change to V.35 signaling on the data 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.35 adapter cable must be connected to the data connector (labeled “RS232”). Refer to V.35 Shunt for procedures on moving the shunt to the V.35 position. Refer to Appendix A for cable details.
Chapter 3 - Unpacking & Setup 3.5 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. Use your best efforts to avoid static discharge when contacting the components inside this unit.
Chapter 4 - Diagnostics
Chapter 4 - Diagnostics 4.1 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. Your equipment can detect local loop failure by the absence or distortion of the digital signal.
Chapter 4 - Diagnostics 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. 1. Set DIP switch #3 on the remote DSU to the down position. 2. Send data from the local DTE, it should be looped back to the local DTE. If you have access to a Bit Error Rate Tester, this can be used in place of the local DTE.
Chapter 4 - Diagnostics 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. 1. 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. 2. Plug the cable into each DSU’s Line jack. 3. On the “good” DSU, set DIP switch #3 to the down position. 4.
Chapter 5 - Service & Warranty
Chapter 5 - Service & Warranty 5.1 Multi-Tech Systems, Inc. Warranty & Repairs Policies 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.
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. In the event that factory service is required, products may be shipped, freight prepaid, to our Mounds View, Minnesota, factory.
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 Drive Mounds View, MN 55112 Attn: Repairs, Serial # ____________ A Returned Materials Authorization (RMA) is not required. Return shipping charges (surface) will be paid by MTS.
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 Distributors of Multi-Tech products are on the distributor web site: www.multitech.com 5.2.4 Replacement Parts SupplyNet, Inc.
Appendix
Appendix Appendix A - Application Examples Introduction This section illustrates several types of applications in which the MT56DSU-S is typically used. These types include: Local Area Data Set DDS point-to-point application DDS multipoint (polled) application Local Area Data Set Application In this application, two pairs of wires provide the connection between two MT56DSU-S devices.
Appendix DDS Multipoint (Polled) Application Since your Central Office (CO) equipment must include “Multipoint Junction Units” (MJUs) and other special arrangements for this type of service, you may need to coordinate efforts with your network service provider. 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.
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 insertion of a keyed RJ-48 plug.
Appendix DB25S Connector 13 25 12 24 11 10 23 9 22 8 21 20 7 6 19 5 18 4 17 3 16 2 15 1 14 Figure B-2. Connector DESCRIPTION This connector ties the MT56DSU-S to the DTE. The DB25S connector has the following pinout configuration.
Appendix DB25S Connector with V.35 Interface 13 25 12 24 11 10 23 22 9 8 21 20 7 6 19 5 18 4 17 3 16 2 15 1 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 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.
Appendix Loopback Cable (MTS P/N 45640100) 1 8 Figure B-5. Loopback Cable Connector 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. Refer to Chapter 4 for test procedures.
Appendix Back-To-Back Cable (MTS P/N 45050000) 1 8 Figure B-7. Back-toBack Cable Connector 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 MultiTech (#45050000), or build one using the instructions below. Refer to Chapter 4 for test procedures. SCHEMATIC 8 7 6 5 4 RJ48S 3 2 1 1 2 3 4 RJ48S 5 6 7 8 7" Figure B-8. BUILD INSTRUCTIONS 1.
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 a label that contains, among other information, the FCC registration number and ringer equivalence number (REN). If requested, this information must be provided to the telephone company. 2. As indicated below, the suitable jack (USOC) connecting arrangement for this equipment is shown in Appendix B.
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. Notice: The Industry Canada label identifies certificated equipment.
S000327A
