ADTRAN Express 6530 6530 Installation And Maintenance Manual

Also see for Express 6530: Job aid

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61225001L1-5D 15Loopbacks may be initiated via the VT100 testscreens, front panel pushbuttons, Nx64K port controlleads, or by receiving V.54 or PN127 in-band loopingsignals. Not all loopback types are available for allports and port services by all initiating sources. SeeTable 9 for an overview. A key to the symbolsdisplayed in the Table 9 is available below the Table.Table 9. Loopback OverviewPortsCustomer, awayfrom SHDSL Port (left)Network, toward SHDSLPort (right)ServicesInitiating Source Nx64K Port G.703 Port SHDSL Port G.704 Service Nx64K ServiceVT100 Test ScreensVT100 Loopback On(Initiates one of fiveloopback types,regardless of theassociated LoopbackType Option setting.)*VT100 Loopback OffLL Button On(Initiates a LocalCustomer Loopback perthe selected port LoopbackType Option setting)SingleserviceonlySingleserviceonlyLL Button OffRL Button On(Initiates a RemoteNetwork Loopback perthe remote unit’s selectedport Loopback TypeOption setting)*RL Button OffNx64K Port Control LeadsC141 LL On(Initiates a LocalCustomer Loopbackper the Nx64K portLoopback Type Optionsetting)C141 LL OffC140 RL On(Initiates a RemoteNetwork Loopbackper the remote unitNx64K port LoopbackType Option setting)*C140 RL OffReceive In-bandPreparatory Signal(Applies the loopbackafter detection ofin-band V.54 or PN127remote looping patternper the associatedservice LoopbackType Option setting)N/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/AN/A N/AReceive In-bandTermination Signal(Terminates loopbackafter detection ofin-band V.54 or PN127remote looping pattern)(Same asNx64K Service)(Same asNx64K Port)(Same asNx64K Port)(Same asNx64K Port)(Same asNx64K Port)(Same asNx64K Port)AISAISAISAISAISAISAISAISAIS AIS AIS AISAISAISAISAIS AISAISAISIn-band Looping Protocol ReceptionKey: Dual Loop AIS Nontransparent LoopTransparent Loop No LoopSendsIn-BandPatternsSendsIn-BandPatternsSendsIn-BandPatternsSendsEOCRequestMessageSendsEOCRequestMessageSendsIn-BandPatternsN/A* The reception of in-band loopback patterns and EOC loopback request messages may be ignored or blocked on certainSHDSL LTUs installed in Total Access 3000 Systems