Multi-Tech Systems MT56DSU-S manual Front Panel

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Chapter 2 - Front & Back Panel Descriptions

2.1Introduction

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.

2.2Front 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. The line LEDs display status whether the line is transmitting or receiving frames, and line status.

Figure 2-1. Front Panel

TD Transmit Data (TD) LED blinks when data is being transmitted - on for a space and off for a mark.

RD Receive Data (RD) LED blinks when data is being

received - on for a space and off for a mark.

V35 The V35 LED lights when the shunt is in the V35 position.

NS The No Signal (NS) LED lights when no signal is received from the network or when the signal is too weak for normal operation.

OOS The Out Of Service (OOS) LED lights when an outage condition occurs. This happens when there is a failure in the digital service that is detected by the network and the Telco sends a repetitive OOS sequence.

CD The Carrier Detect (CD) LED lights when a carrier signal is received from the network.

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Contents User Guide MT56DSU-S Syncronous 56K bps Data Service UnitRevision Date Description Contents Service & Warranty Introduction About This Manual IntroductionCSU Functions DescriptionCSU/DSU Basics DSU FunctionsFeatures Specifications Front & Back Panel Descriptions Front Panel Front PanelBack Panel Power Connector2 RS232 Connector Line ConnectorSwitch Settings Mode Position Description Switch SettingsShunts ShuntsUnpacking & Setup Unpacking Telecom Safety WarningsBack Panel Connections SetupV.35 Shunt Diagnostics Loopback Test Loopback Test DiagramDSU Loopback Test Line Loopback TestDSU Back-to-Back Test DSU Back-to-Back Test DiagramService & Warranty 2 U.S. and Canadian Customers Multi-Tech Systems, Inc. Warranty & Repairs PoliciesWarranty International Distributors International Customers outside U.S.A. and CanadaRepairs Repair Procedures for U.S. and Canadian CustomersRepair Procedures for International Customers Internet Site Technical SupportAppendix DDS Point-To-Point Application Appendix a Application ExamplesIntroduction Local Area Data Set ApplicationFigure A-3. DDS Multipoint Polled Application DDS Multipoint Polled ApplicationRJ-48 Connector Appendix B Interface Signals and Connector PinoutsPin Description Signal DB25S ConnectorPin Description DB25S Connector with V.35 InterfaceBuild Instructions Loopback Cable MTS P/NBack-To-Back Cable MTS P/N Figure B-7. Back-toBack Cable ConnectorFCC Regulations for Telephone Line Interconnection Appendix C Regulatory InformationCanadian Limitations Notice S000327A