ADC H4TU-C-319 List 1 Line Unit, HDSL4 Generic Loopback Commands, Special Loopback Commands

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LTPH-UM-1031-03, Issue 3

Testing

 

 

Generic Loopback Commands

The HDSL4 Generic Loopback (GNLB) commands allow you to use inband codes to loop up either

NLOC (4-in-7) or NREM (3-in-7) towards the network. In addition, these inband codes loop up CREM (6-in-7) or CLOC (5-in-7) towards the customer. Either loopup condition can be terminated (looped down) with the 3-in-5, SMJK loopdown code. All inband codes must be present for at least 5 seconds before the HDSL4 system responds. TLOS is a logic loopback caused by loss of the DS1 input from the CI.

Figure 29 on page 50 summarizes the available loopbacks in the system, and Table 16 summarizes the HDSL4 generic loopback commands. See “GNLB Test Procedures” on page 51 for the test procedures that apply

HDSL4 systems feature the SmartJack option, which can emulate a Network Interface Device (NID) for the purpose of loopback testing of the HDSL4 circuit. SMJK and NREM loopbacks perform the same functions but their initiation differs. SMJK indicates that the loopback was initiated by the 2-in-5 inband command. NREM, on the other hand, is initiated by the 3-in-7 inband command or by a command issued from the maintenance terminal or the MODE and SEL pushbuttons.

Use the inband commands to enable or disable the SMJK loopback options. The H4TU-C-319 system setting is normally enabled to recognize all inband SmartJack loopback commands.

Special Loopback Commands

A3LB and A5LB loopback commands can be sent by a test set connected to the H4TU-C or H4TU-R. See Table 17 on page 52 and Table 18 on page 53 for a list of the commands.

A3LB and A5LB are special, addressable, repeater loopback modes which are supported by the H4TU-C. These loopback modes provide the HDSL4 system with sophisticated maintenance and troubleshooting tools. A3LB and A5LB are patterned after the Westell addressable T1 repeater loopbacks.

The A5LB loopback selection complies with that proposed for HDSL4 systems in the T1E1.4/92 looopback recommendation with the following additions:

•Query loopback

•IOR (Intelligent Office Repeater) power-down

•Four loopback time-out choices

•Initiation from either end

•Repeating bit error signatures

•Alternate query loopback

A5LB does not block the arming code from exiting the H4TU-C-319 into the network. Since A5LB never blocks the arming code from exiting the H4TU-C, the Far-End Activate code is not available in A5LB. A3LB supports the additional (1-in-6) SMJK loopback command.

H4TU-C-319 List 1

September 12, 2003

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Contents H4TU-C-319 List 1 Line Unit HDSL4September 12 IssueDate Revisions Made 2001 Initial release March 15Inspecting Shipment Using this ManualInspecting Shipment Table of Contents Appendix B Functional Operation List of Figures Config MenuList of Tables Navigational Keys for the Maintenance Terminal ScreensOverview FeaturesApplications H4TU-C-319 List 1 Front Panel Front PanelLine Front-Panel Feature FunctionFront-Panel Description BRGMessage Full Name Description Front-Panel Display MessagesLoopback Messages Diagnostic MessagesSystem Information Messages a Substitution B8ZS Marg Margin Current margin threshold setting measured in dBFRM Frame SF, ESF, Unfr Code Line Code AMI, B8ZSInstalling the H4TU-C-319 List 1 into a Shelf InstallationVerification without a Downstream Device VerificationVerification with a Downstream Device Setting Options through Mode and SEL Using the Mode and SEL PushbuttonsProvisioning Loopback Modes Resetting to Factory DefaultDisplaying System Parameter Settings Disabling an AlarmLogon Screen Using a Maintenance TerminalConnecting to a Maintenance Terminal Navigational Keys for the Maintenance Terminal ScreensMenu Functions Press this keyPress this key To access this menu Menu Functions Provisioning Tasks Setting Date and TimeInventory Screen Setting Circuit ID NumbersConfig Menu Configuring the SystemConfig Menu Standard Options defaults shown Auto H4TU-C-319 List 1 Standard Config Menu Options60 min 38 dBDEF H4TU-C-319 List 1 ADC Config Menu OptionsADC Config Menu Screen Selection Description Options DISALM ENA HDSL4 BER HberNone LpbkParameter DS1/DSX-1 24-Hour PM ThresholdResetting to Factory Defaults Config Menu Master Clear Clearing the History, Alarm, and Event Log ScreensMonitoring System Activity and Performance Using the Monitor Screen to View System ActivitySystem Overview Field Description Monitor Screen DescriptionsMAL LPF InslPRM Performance History at the DS1 Interface Using the Performance Screens to View Performance DataH4TU-C DS1 25-Hour Performance History H4TU-R DS1 Current Statistics Acronym Description Acronyms Used on the DS1 Performance History ScreensH4TU-C Hdsl Loop 1/Loop 2 31-Day Performance History Performance History at the HDSL4 InterfaceH4TU-C Hdsl Loop 1/Loop 2 25-Hour Performance History Losws Acronyms Used on the HDSL4 Performance History ScreensSES UASAlarm History at the DS1 Interface Using the Performance Screens to View Alarm DataPRM-NE Prmn Screen Alarm Front-PanelDescription H4TU-C DS1 Alarms onH4TU-R DS1 Alarms on this RAI RraiHDSL4 Alarms at the H4TU-C only Alarm History at the HDSL4 InterfaceSystem Event Log Using the Event LOG to Track System EventsEvent Log Messages Event Log Entry Messages ListPRM-FE Report Menu Full Report Using the Report MenuType Contains the following information Report TypesFront-Panel Alarm Description To Inhibit Message a TestingSystem Alarms Front-Panel System AlarmsPrmn Front-Panel Alarm DescriptionRetiring System Alarms Alarm Option for DLC FeedRemote LOS and AIS Response OCT55 Test Pattern with AMI Line CodeLoopback Summary Loopback OperationSpecial Loopback Commands Generic Loopback CommandsManual Loopback Session Setting the Loopback Time-Out Option LbtoGeneral Troubleshooting Tips Loopback Test ProceduresLoopback Modes MODE/SEL Gnlb Test ProceduresSummary of HDSL4 Loopback and Activation Codes Loopback Code Description Test Set Craft PortA3LB Addressable Repeater Loopback Commands A3LB Test ProcedureName A5LB Addressable Repeater Loopback Commands A5LB Test ProcedureTesting LTPH-UM-1031-03, Issue Option Description Testing with H4TU-C Bert GeneratorBert Signal Generator Bert Signal PatternH4TU-R Bert Generator Screen Testing with H4TU-R Bert GeneratorHDSL4 Appendix a SpecificationsSystem One-way DS1 Delay 700 µs Wander LoopedWideband Jitter Looped UI maximum Narrowband Jitter Looped Maximum Power Dissipation Power ConsumptionH4TU-C Power Parameters 196 KHz dB/kft HDSL4 Reach ChartMaximum Current Drain Loop ATTENUATION, Insertion LOSS, and ReachNetwork Management Control Bus Fuse AlarmCraft Port System Alarm Output PinTiming Ground Fault DetectionSpectrum Issues Appendix B Functional OperationAppendix C Compatibility Online Technical Support Online Technical Publications Appendix D Product SupportSales Assistance Systems IntegrationAppendix E Abbreviations Lbto LaisLatt LbpvLTPH-UM-1031-03, Issue FCC Class a Compliance Limited Warranty Certification and WarrantyFor Technical Assistance World Headquarters
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