ADTRAN D4 U-BR1TE V Installation And Maintenance Manual

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ADTRAN D4 U-BR1TE V Installation And Maintenance Manual Manual pdf 12 page image

12 Section 61104020L4-5, Issue 3 61104020L4-5CPerformance MonitoringLocal Performance Monitoring is available only forthe U-interface, when configured for a leased mode ofoperation. See the subsections entitled LoopbackTests, Point-to-Point Test, and Local Loopback forapplicable test descriptions.ADTRAN U-BR1TE Bidirectional LoopbackIn LULT Mode, the ADTRAN U-BR1TE will executea bidirectional loopback when performing DS0 DPloopback. See Figure 9 for an illustration of thebidirectional loopback.Remote End Initiated LBK TestsThe U-BR1TE supports loopbacks generated from theremote unit which allows testing to be performedwithout coordination with the CO or test center.Loopbacks initiated by the OCU-R front panel LBKpushbutton aid in system turn up testing ortroubleshooting from the remote end.The U-BR1TE responds to a loopback commandinitiated at the OCU-R as follows:Pressing the OCU-R LBK pushbutton on the OCU-Ronce will initiate a loopback at the U-BR1TE towardthe customer. See Figure 10. This allows data to besent from the remote end to test the local loop and theOCU-R. This loopback is indicated by a flashingCUST LBK LED on the IDSL OCU-R and a solidLBK LED on the U-BR1TE.Pressing the OCU-R LBK pushbutton a second timewill initiate a loopback at the OCU-R toward the4-wire DDS (CPE) interface. A solid CUST LBKLED on the IDSL OCU-R indicates a loopback at theIDSL OCU-R toward the customer equipment.See Figure 11. Pressing the OCU-R LBK pushbuttona third time disables all current latching loopbacksinitiated by the OCU-R LBK pushbutton.If errors exist the loopbacks can help determine thesource; either the local loop or the OCU-R.Test SetIDSL OCU-RADTRAN U-BR1TEBidirectionalloopbackFigure 9. ADTRAN U-BR1TE BidirectionalLoopbackFigure 11. IDSL/DDS Remote End Initiated Loopback, Customer Loop4-WireCPE InterfaceOCU-RPush twice forOCU-R LoopbackLocal LoopASC 9EhU-BR1TE LoopbackPushbuttonTestSetASC 9EhFigure 10. IDSL/DDS Remote End Initiated Loopback, Local Loop4-WireCPE InterfaceOCU-RPush once forU-BR1TE LoopbackLocal LoopASC 9Eh U-BR1TE LoopbackPushbuttonTestSet

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