ADC HDSL4, H4TU-C-319 List 1 Line Unit user manual Loopback Operation, Loopback Summary

Page 54

Testing

LTPH-UM-1031-03, Issue 3

 

 

LOOPBACK OPERATION

HDSL4 has a family of loopback options for analyzing circuit functionality. The loopback signal is transmitted and returned to the sending device for comparison. This allows you to verify the integrity of the HDSL4 channels to the H4TU-C, the H4TU-C DSX-1 interface, and the DS1 channels to the customer.

Loopback options include:

Generic Loopback (GNLB) options, including the SmartJack (SMJK) option (see Table 16 on page 51)

A3LB Addressable Repeater Loopback command (see Table 17 on page 52)

A5LB Addressable Repeater Loopback command (see Table 18 on page 53)

Loopback commands can be initiated by:

Selecting the loopback type using the MODE and SEL pushbuttons on the H4TU-C front panel or the manual loopback (LBK) pushbutton on the H4TU-R front panel

Selecting the loopback type from the Monitor menu when connected to the craft port of the H4TU-C or H4TU-R

Entering the loopback code (exceptions are COLB and RULB) into the test equipment connected to the H4TU-C or H4TU-R

Activate loopback using one of the following:

MODE/SEL pushbuttons

Maintenance Terminal

Test Set

 

Span 1

DSX-1

 

 

NLOC

CREM

NDU1

 

H4TU-C

H4D1

Span 2

CDU1 NDU2

Span 3

NREM

CDU2 SMJK

TLOS*

H4D2

CLOC

H4TU-R

Activate loopback using one of the following:

LBK pushbutton

Maintenance Terminal

Test Set

* When enabled, TLOS is an automatic loopback that occurs with an LOS at the remote DS1 input.

Network

Customer

Premises

 

Figure 28. Loopback Summary

ADC HDSL4 supports multiple loopbacks, but a single loopback is the preferred method. HDSL4 automatically rejects activation of closed loop looopbacks. For example, an NREM and CREM cannot be activated at the same time.

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September 12, 2003

H4TU-C-319 List 1

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Contents HDSL4 H4TU-C-319 List 1 Line Unit2001 Initial release March 15 IssueDate Revisions Made September 12Using this Manual Inspecting ShipmentInspecting Shipment Table of Contents Appendix B Functional Operation Config Menu List of FiguresNavigational Keys for the Maintenance Terminal Screens List of TablesFeatures OverviewApplications Front Panel H4TU-C-319 List 1 Front PanelBRG Front-Panel Feature FunctionFront-Panel Description LineFront-Panel Display Messages Message Full Name DescriptionDiagnostic Messages Loopback MessagesSystem Information Messages a Code Line Code AMI, B8ZS Marg Margin Current margin threshold setting measured in dBFRM Frame SF, ESF, Unfr Substitution B8ZSInstallation Installing the H4TU-C-319 List 1 into a ShelfVerification Verification without a Downstream DeviceVerification with a Downstream Device Using the Mode and SEL Pushbuttons Setting Options through Mode and SELProvisioning Disabling an Alarm Resetting to Factory DefaultDisplaying System Parameter Settings Loopback ModesNavigational Keys for the Maintenance Terminal Screens Using a Maintenance TerminalConnecting to a Maintenance Terminal Logon ScreenPress this key Menu FunctionsPress this key To access this menu Menu Functions Setting Date and Time Provisioning TasksSetting Circuit ID Numbers Inventory ScreenConfiguring the System Config MenuConfig Menu Standard Options defaults shown 38 dB H4TU-C-319 List 1 Standard Config Menu Options60 min AutoDIS H4TU-C-319 List 1 ADC Config Menu OptionsADC Config Menu Screen Selection Description Options DEFLpbk HDSL4 BER HberNone ALM ENADS1/DSX-1 24-Hour PM Threshold ParameterResetting to Factory Defaults Clearing the History, Alarm, and Event Log Screens Config Menu Master ClearUsing the Monitor Screen to View System Activity Monitoring System Activity and PerformanceSystem Overview Monitor Screen Descriptions Field DescriptionMAL Insl LPFPRM Using the Performance Screens to View Performance Data Performance History at the DS1 InterfaceH4TU-C DS1 25-Hour Performance History H4TU-R DS1 Current Statistics Acronyms Used on the DS1 Performance History Screens Acronym DescriptionPerformance History at the HDSL4 Interface H4TU-C Hdsl Loop 1/Loop 2 31-Day Performance HistoryH4TU-C Hdsl Loop 1/Loop 2 25-Hour Performance History UAS Acronyms Used on the HDSL4 Performance History ScreensSES LoswsUsing the Performance Screens to View Alarm Data Alarm History at the DS1 InterfaceRAI Rrai Screen Alarm Front-PanelDescription H4TU-C DS1 Alarms onH4TU-R DS1 Alarms on this PRM-NE PrmnAlarm History at the HDSL4 Interface HDSL4 Alarms at the H4TU-C onlyUsing the Event LOG to Track System Events System Event LogEvent Log Entry Messages List Event Log MessagesPRM-FE Using the Report Menu Report Menu Full ReportReport Types Type Contains the following informationFront-Panel System Alarms TestingSystem Alarms Front-Panel Alarm Description To Inhibit Message aFront-Panel Alarm Description PrmnAlarm Option for DLC Feed Retiring System AlarmsOCT55 Test Pattern with AMI Line Code Remote LOS and AIS ResponseLoopback Operation Loopback SummaryGeneric Loopback Commands Special Loopback CommandsSetting the Loopback Time-Out Option Lbto Manual Loopback SessionLoopback Test Procedures General Troubleshooting TipsLoopback Modes Loopback Code Description Test Set Craft Port Gnlb Test ProceduresSummary of HDSL4 Loopback and Activation Codes MODE/SELA3LB Test Procedure A3LB Addressable Repeater Loopback CommandsName A5LB Test Procedure A5LB Addressable Repeater Loopback CommandsTesting LTPH-UM-1031-03, Issue Bert Signal Pattern Testing with H4TU-C Bert GeneratorBert Signal Generator Option DescriptionTesting with H4TU-R Bert Generator H4TU-R Bert Generator ScreenAppendix a Specifications HDSL4One-way DS1 Delay 700 µs Wander Looped SystemWideband Jitter Looped UI maximum Narrowband Jitter Looped Power Consumption Maximum Power DissipationH4TU-C Power Parameters Loop ATTENUATION, Insertion LOSS, and Reach HDSL4 Reach ChartMaximum Current Drain 196 KHz dB/kftFuse Alarm Network Management Control BusSystem Alarm Output Pin Craft PortAppendix B Functional Operation Ground Fault DetectionSpectrum Issues TimingAppendix C Compatibility Systems Integration Appendix D Product SupportSales Assistance Online Technical Support Online Technical PublicationsAppendix E Abbreviations Lbpv LaisLatt LbtoLTPH-UM-1031-03, Issue Certification and Warranty FCC Class a Compliance Limited WarrantyWorld Headquarters For Technical Assistance