Multi-Tech Systems MMV1600 TestCables, TroubleshootingGuide, Data Troubleshooting Guide

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7.3

TestCables

If you are using the MultiMux internal DSU, there are two test cables provided which can be used to help checkout your system (refer to Figure 7-1). The MultiMux Test cable is a special back-to-back composite link test cable that can connect your two MultiMuxes locally before installing them using a phone line. This cable will allow you to verify operation of all aspects of the MultiMux prior to actual installation. The second test cable is the Composite Link Loopback cable. Its function is to loopback the DSU signals to itself (loopback) so that you can check the function of the MultiMux while installed without having to use the composite link phone line. If you are using an external synchronous modem for the link communications, refer to its documentation for testing procedures.

If you have any problems in performing these procedures, contact Multi-Tech’s Technical Support department for assistance, refer to Chapter 8.

Using the Test Cable

Test Cable

MultiMux

MultiMux

Internal Composite

Connector

Note: Used locally before installation to verify operation of entire system except compolsite link.

Using the Composite Link Loopback Cable

MultiMux

Internal Composite Connector

Composite Link

Loopback Cable

MultiMux

Note: Initiate Downline Load must be off for loopback testing.

Figure 7-1. Off Line Test Modes

7.4

TroubleshootingGuide

The following guides are set up as a series of possible conditions, causes and suggested fixes or steps in finding the failing unit. Because of the different manufacturer’s equipment involved in typical multiplexer networks, you may encounter “finger pointing” as to who is at fault. Who is at fault is not as important as getting you back on line as soon as possible. The intent of the following guides are to indicate the most probable cause of specific error conditions, but, since similar conditions may account for a number of different failures, the following guides are just that: a guide to troubleshooting.

The parts of your mux network are:

Data Channel

•Channel devices (printers, terminals, pc’s, etc.)

•Channel Communications (RS232 cabling, asynchronous modems, etc.) Voice/Fax Channel

•Telephones and fax machines

•Station side of PBX

•E&M trunk

Control units

Composite Link

•Digital composite link communications line with internal or external DSU

•External Synchronous link modems

•Composite link communications line (4-wire non-loaded metallic wire)

Once you have found the probable cause of your problem, refer to the specific manual chapter for additional help, or contact Multi-Tech Technical Support (refer to Chapter 8).

Table 7-1. Data Troubleshooting Guide

Condition

Possible Cause

Corrective Action

Supervisory Console

1. Communications software

1. Install communications software on

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Contents MultiMux Page Record of Revisions RevisionDescription MultiMux #MMV1600C #MMV3200CTable of Contents Operating Procedures CommandsTroubleshooting Service, Warranty and Tech SupportTables AboutThisManual Service, Warranty and Tech Support 1.1 Statistical Multiplexing BackgroundDescription of Statistical Multiplexing Product Description CommunicationsMultiMux MMV1600/3200 Series Block Diagram Page Networking System Features Voice/FaxDual Composite Links Dynamic Load BalanceCommand Modem Channel SwitchingDiagnostics Parameter MemorySynchronous Data Channel Dynamic BufferingResponse Time Control DOC Terminal Equipment FCC Regulations for Telephone Line InterconnectionAU7USA-18883-DE-N DSU AU7USA-20328-MD-ESystem Control Specifications Async Data ChannelsComposite Link Internal DSUElectrical/Physical Voice ChannelsCompatibility DtmfModel Description Configuration DescriptionConfiguration Configuration 1 Composite Link Configuration Configuration 1 Local Site Channel ParametersConfiguration 1 Remote Site Channel Parameters Configuration 2 Composite Link Configuration Remote Site Configuration 3 Remote Site 2 Channel Parameters Configuration 3 Local Site Channel ParametersConfiguration 3 Remote Site 1 Channel Parameters Configuration 4 Local Site Voice/Fax Channel Parameters Configuration 4 FXO to FXSConfiguration 4 Remote Site Voice/Fax Channel Parameters Configuration 5 E&M Configuration 5 Remote Site Voice/Fax Channel Parameters Configuration 5 Local site Voice/Fax Channel ParametersConfiguration 6 FXS to FXS Configuration 6 Remote Site Voice/Fax Channel Parameters Configuration 6 Local Site Voice/Fax Channel ParametersRemote Site Configuration 7 Remote Site Voice/Fax Channel Parameters Configuration 7 Local Site Voice/Fax Channel ParametersConfiguration 8 LAN to LAN Page Cabling Procedure InstallationProcedureStepProcedure External Modem/DSU with RS232C InterfaceV.35 Interface Step ProcedureSync Data Channel Port B only Async ChannelComposite Link Cabling Supervisory Console Configuration ProcedureCommand Modem Step Procedure Voice/Fax Channels Step Procedure Async ChannelsPage ATC1B4800P1F1E0 Command SummaryType Command Description $DSUACL SNGA..H$DSUBCL $DSUASP#MA CommandDescriptionGeneral Commands Store New H command menu is as follows General HelpParameters HelpH5 menu is as follows H4 menu is as followsH6 menu is as follows H7 menu is as followsChannel Parameter Commands DTR ENQ/ACKMLA/B/D SB2 SB1$DSUCL Composite Link Speed and Clocking Commands$DSUSP $ Muxacli$MUXB Additional Composite Link CommandsList Composite Retransmit TimerReport #RBxxxxxVoice/Fax Channel Commands Command Level Silence Suppression WireLocal Interface ATV1/2LIFXOATV1/2LIFXSL Test CommandsATV1/2RIFXO ATV1/2RIFXSGT12 Command Modem CommandsT11 MultiMux Operating Procedures MultiMuxOperatingProceduresConfiguration of Port a Composite Link Configuration of Port B Composite LinkConfiguration of Port B Sync Data Voice/Fax Operating Procedures Voice/Fax Operating ProceduresCommand Modem Access on Command Modem Operating ProceduresCommand Modem Operating Procedures Command modem operation and put Introduction ImportanceofCompositeStatisticsTestCables TroubleshootingGuideData Troubleshooting Guide RD LED on RD OFF Voice/fax channel Voice/Fax Troubleshooting GuideCannot communicate Local Loop Test #4 ChannelDeviceTestingChannel Device Testing Procedure Remote Digital Loop Test #5 DSUandCommunicationsLineTestingDSU and Communications Line Testing Procedure Watch DOG Test Passed MultiMuxFunctionalTestingProceduresMultiMux Functional Testing Procedures VOICE/FAX Loopback Test #12 Voice/FaxChannelTestingVoice/Fax Channel Testing Procedure Sync Data Channel Testing Procedure SyncDataChannelTestingService, Warranty and Tech Support Repair Procedures for International Distributors AppendixA Ascii Character Code/Hex/Decimal Conversion ChartAppendix B Signal Information Negative PositiveAppendix C Cabling DiagramsDCE to DTE cabling Command Port CablesComposite Link Cabling RJ48 Cabling for Internal DSU Voice/Fax Channel Connectors RJ45 Spade Lug Wire Color FunctionDescription FXO Description FXS Description I-V Voice/Fax Channel CableAnswer a Command Name DefaultRepeat LastATH0 ATH1ATO ATQ1Register ATD5551212RRead or WriteView Active Configuration displaysUser Profiles Store ActiveATX2 ATX0ATX1 Mode While Command ExecutionReturning to After DialAppendix E Table E-1. LED IndicatorsIndicator Description FCR LED Indicators DescriptionBack Panel Power Connector ON/OFF SwitchBPS Modem DIAL-UP Line Connector Command Port TERMINAL/PC ConnectorVOICE/FAX Channel 2 FXO Connector VOICE/FAX Channel 2 FXS ConnectorVOICE/FAX Channel 1 E&M Connector VOICE/FAX Channel 1 FXS ConnectorChannel # Channel Board Number of Channels SwitchRS232C/V.35 Shunt Flow Control Background Appendix FOff Printer pacing and Flow Control Glossary of Terms Page Format Page Parameter Page Page Symbols DSU DOCLads External Composite LinkFXO FXS Load DSU Factory Defaults Command List Channel Parameters CommandMultiMux Functional Testing Procedure Link ProtocolPstn PDNREN RJ48SStdm Stop Bit Command SB1-SB2Transmit XMT Indicator Voice/Fax Input Level Gain Command Voice/Fax Channel Testing ProcedureWord Length Select Command WL5-8 Voice/Fax Channels
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