Multitech MT56DSU-R Owner's Manual

MultiDSU56KTMRack Mount Multi-Rate DSUModel MT56DSU-ROwner's Manual82023101.p65 2/12/01, 2:52 PM1

MT56DSU-R Owner's Manual101.6 FCC Regulations for Telephone LineInterconnection1. This equipment complies with Part 68 of the FCC rul

Chapter 1 - Introduction and Description117. No repairs are to be made by you. Repairs are to be made onlyby Multi-Tech Systems or it

MT56DSU-R Owner's Manual121.7 SpecificationsModel Number MT56DSU-RDevice Operation combined DSU and CSUData RatesSynchronous 2400, 4800,

Chapter 1 - Introduction and Description13Input Impedance 135 ohmsDelay Times (in msecs.)RTS/CTS DCD on DCD off2400 8.1 7.5 7.04800 4.3 2.

MT56DSU-R Owner's Manual1482023101.p65 2/12/01, 2:52 PM14

MultiDSU56KTMChapter 2 -Hardware Installation82023101.p65 2/12/01, 2:52 PM15

MT56DSU-R Owner's Manual162.1 IntroductionThis chapter provides the information needed to configure andinstall the MT56DSU-R in a Mult

Chapter 2 - Hardware Installation172.2.1 12 -Position DIP Switch (# 1-12)The 12-position DIP switch is used to set data rate, clockin

MT56DSU-R Owner's Manual182.3 Changing the Default DIP Switch SettingsUse Table 2-1 to determine the DIP switch setting changes requ

Chapter 2 - Hardware Installation19Table 2-1. MT56DSU-R Switch Settings (Cont'd)Switch DescriptionNormal/Diagnostics Mode-9 Up - normal

Owners ManualP/N 82023101, Rev. BModel No. MT56DSU-RThis publication may not be reproduced, in whole or in part, without priorexpr

MT56DSU-R Owner's Manual202.4 Installation ProcedureAfter your CC216G modem rack has been installed in your computercabinet or in a

Chapter 2 - Hardware Installation21Table 2-2. Installation (cont'd)7. To connect the DTE to the MT56DSU-R using a V.35 interface,con

MT56DSU-R Owner's Manual2282023101.p65 2/12/01, 2:52 PM22

MultiDSU56KTMChapter 3 - Operation82023101.p65 2/12/01, 2:52 PM23

MT56DSU-R Owner's Manual243.1 IntroductionThis chapter provides information on the operating functions of theMT56DSU-R. During normal o

Chapter 3 - Operation253.2.3 Anti-StreamingThis option is typically enabled on remote DSUs using multi-pointlines. When enabled, the anti-s

MT56DSU-R Owner's Manual263.2.5 System StatusWith this option enabled, the MT56DSU-R conditions the DSRsignal with additional parameter

Chapter 3 - Operation273.2.7 ClockingThis option allows selection of the MT56DSU-Rs clocking (timing forsynchronization) from one of three

MT56DSU-R Owner's Manual283.2.9 DSR Forced OnWhen this option is enabled, the MT56DSU-R forces the DSR signalon continuously regardl

Chapter 3 - Operation293.3 LED IndicatorsThe front panel of the MT56DSU-R contains ten LED indicators thatcan help in troubleshooting net

ContentsChapter 1 - Introduction and Description1.1 Introduction ...

MT56DSU-R Owner's Manual30 Wire GageData Rate 19 AWG 22 AWG 24 AWG 26 AWG2400 bps 22.0 15.0 12.0 9.5 miles4800 bps 19.0 13.0 10.0 8.0 mile

MultiDSU56KTMChapter 4 - Troubleshooting82023101.p65 2/12/01, 2:52 PM31

MT56DSU-R Owner's Manual324.1 IntroductionAll of the indicators used in normal operation of the MT56DSU-R arelabeled on the LED overl

Chapter 4 - Troubleshooting334.2.1 RCV IndicatorThe RCV (Receive) LED lights when the MT56DSU-R receives data( 0 or a space) from the ne

MT56DSU-R Owner's Manual344.2.7 RTS IndicatorThe RTS LED lights when the RTS signal is received from the DTE.The DIP switch for RT

Chapter 4 - Troubleshooting354.3 Diagnostic TestsThe MT565SU-R is set to a default of Normal (non-diagnostic) modeat the factory. When d

MT56DSU-R Owner's Manual364.3.2 Digital Loopback TestThis test allows you to test the local DTE, the local MT56DSU-R, thecommunicatio

Chapter 4 - Troubleshooting374.3.3 Digital Loopback With Test Pattern TestThis test allows you to test the local MT56DSU-R, thecommunicat

MT56DSU-R Owner's Manual384.3.4 Test Pattern TestThis test allows you to test the local MT56DSU-R, thecommunications link, and the r

Chapter 4 - Troubleshooting394.3.5 DSU Loopback TestThis test lets you verify proper MT56DSU-R operation by matchinga transmitted signal

3.2.11 Normal/Diagnostics... 283.3 LED Indicators ...

MT56DSU-R Owner's Manual404.3.6 DSU Back-to-Back TestThis test lets you connect two MT56DSU-Rs with a back-to-backcable to verify p

MultiDSU56KTMChapter 5 - Warranty, Service andTech Support82023101.p65 2/12/01, 2:52 PM41

MT56DSU-R Owner's Manual425.1 ServiceIn the event service is required, equipment may be sent, freightprepaid, to our factory. Return

Chapter 5 - Warranty, Service and Tech Support435.3 Tech Support and BBSMulti-Tech has an excellent staff of tech-support personnel avai

MT56DSU-R Owner's Manual4482023101.p65 2/12/01, 2:52 PM44

MultiDSU56KTMAppendixes82023101.p65 2/12/01, 2:52 PM45

MT56DSU-R Owner's Manual46Appendix A - Application ExamplesIntroductionThis section illustrates several types of applications in which

Appendix A - Application Examples47DDS Multi-Point (Polled) ApplicationSince your Central Office (CO) equipment must include Multi-pointJun

MT56DSU-R Owner's Manual48Local Area Data Set ApplicationIn this application, two pairs of wires provide the connectionbetween two

Appendix A - Application Examples49Analog Off-Net Extension ApplicationIn this application, the MT56DSU-R is used with conventionalanalog m

MultiDSU56KTMChapter 1 - Introduction and Description82023101.p65 2/12/01, 2:52 PM5

MT56DSU-R Owner's Manual50Appendix B - Interface Signals and Connector PinoutsRS232C DB9 CONNECTORDESCRIPTIONThis connector ties th

Appendix B - Interface Signals and Connector Pinouts51RS232C DB25S CONNECTORReceive Clock (RC) —Transmit Clock (TC) —131211109 — Test Voltage

MT56DSU-R Owner's Manual52V.35 INTERFACE ADAPTER CABLEDESCRIPTIONThis adapter cable should be used when the MTDSU56-R isconfigured for V

Appendix B - Interface Signals and Connector Pinouts53LINE CABLEDESCRIPTIONThis cable lets you connect the MT56DSU-R to your DDS Network.

MT56DSU-R Owner's Manual54LOOPBACK CABLEDESCRIPTIONThis cable lets you test the MT56DSU-R when a second DSU is notavailable. It tests

Appendix B - Interface Signals and Connector Pinouts55BACK-TO-BACK CABLEDESCRIPTIONThis cable lets you test a suspect DSU by connecting i

MT56DSU-R Owner's Manual5682023101.p65 2/12/01, 2:52 PM56

MultiDSU56KTMGlossary82023101.p65 2/12/01, 2:52 PM57

MT56DSU-R Owner's Manual58This section defines several of the terms used in this manual. For anoverview of DSU basics, refer to sec

Glossary59Control station - the station on a DDS multipoint circuit that isnearest the host system and transmits data to each remote sta

MT56DSU-R Owner's Manual61.1 IntroductionCongratulations! Your new MT56DSU-R is one of the finest DSU/CSUs available today. As a combi

MT56DSU-R Owner's Manual60EElastic store - an option that causes the DSU to allow for timingphase drifts in non-DDS applications.FFo

Glossary61Multipoint circuit - a type of DDS network that includes one controlstation, attached remote stations, and all channel, MJU and

MT56DSU-R Owner's Manual62TTest pattern - a diagnostic test for sending , detecting and checkinga pre-defined pattern of bits.Two-wi

Glossary6382023101.p65 2/12/01, 2:52 PM63

8202310182023101.p65 2/12/01, 2:52 PM64

Chapter 1 - Introduction and Description71.3 DescriptionThe MT56DSU-R is a rack-mounted DSU/CSU that is easy tooperate and has the featur

MT56DSU-R Owner's Manual81.4 CSU/DSU BasicsA DSU (Data Service Unit) and a CSU (Channel Service Unit) aretypically connected to provi

Chapter 1 - Introduction and Description91.5 FeaturesThe MT56DSU-R provides many useful features. Standard featuresinclude V.35 and RS232