ADTRAN SLC-5 U-BR1TE III Installation And Maintenance Manual

Also see for SLC-5 U-BR1TE III: Specifications

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ADTRAN SLC-5 U-BR1TE III Installation And Maintenance Manual Manual pdf 11 page image

Section 61102040L4-5, Issue 261102040L4-5B 11DS0 DP Loopbackeoc RemappingUpon receipt of subsequent DS0 DP loopback codeswhen the D channel is disabled, the U-BR1TE IIIremaps the subsequent DS0 DP loopback sequencesinto the respective ISDN eoc loopback messages.This capability will permit all downstream ISDN Dchannel enabled U-BR1TEs, U-Repeaters, andTRISDN elements to respond to standard DDS DS0DP loopback commands via the ISDN eoc as shown inFigure 7.NOTEFor DDS circuits with the D channel disabled,all tandem U-BR1TE elements should beADTRAN U-BR1TEs with DDS LoopbackCapability for remote end test operation (OCU)to function properly. See 2B in Figure 6. In Dchannel disabled applications, older non-DDSvintage U-BRITEs may not pass the OCUlatching loopback sequence to the IDSL OCU-R.Upon receipt of an OCU latching loopback sequencethe U-BR1TE III passes the OCU sequence in-banddownstream to the IDSL OCU-R. U-BR1TE IIIs donot respond to the CSU latching loopback commandbut simultaneously passes it through to the CSU/DSUwhile mapping the NT1 eoc address. The IDSLOCU-R reverses sealing current on its 4-wire AMIDDS interface to place the customer CSU intoloopback upon receipt of the CSU latching loopback.The following data sequence enables the DS0 DP,OCU, and CSU latching loopbacks:1. Minimum of 35 transition in progress (TIP)bytes (X0111010).2. Minimum of 35 loopback select code (LSC)bytes: DS0 DP (X0000101), OCU (X1010101),CSU (X0110001).3. Minimum of 100 loopback enable (LBE) bytes(X1010110).4. Minimum of 32 far-end voice (FEV) bytes(X1011010).If the U-interface of the U-BR1TE III is not in sync,the unit transmits Mux-Out-of-Sync (X0011010)upstream towards the network.X Denotes Don’t Care bit - either a 1 or a 0.Disabling DS0 DP, OCU, or CSU latching loopbacksequence:1. Minimum sequence of 35 TIP bytes.Front Panel TestsThe valid front panel tests in leased modes are ADR1,CRTX, LPTX, and LPBK for all circuit positions.NT1, ADR1-ADR6 loopback tests are valid for theLULT mode only. ADR2 would be used to test aU-Repeater or ADR2 and ADR3 would be used to testTRISDN elements respectively.Initiate Loopback at IDSL OCU-RWhen used for DDS, the SLC-5 U-BR1TE mayinitiate a loopback at the IDSL OCU-R. The in-bandlatching OCU loopback code is sent to loop the IDSLOCU-R when the NT1 address is selected on SW3.To invoke the OCU loopback at the IDSL OCU-R, thefront panel test knob must be in the NT1 addresslocation.ADTRAN U-BR1TE Bidirectional LoopbackIn LULT mode, the ADTRAN U-BR1TE will executea bidirectional loopback when performing DS0 DPloopback. Refer to Figure 8 for an illustration of thebidirectional loopback.Figure 7. IDSL/DDS Loopback ResponseTestHeadISDNRPTRU-BR1TE1BU-BR1TE1B+DIDSLOCU-RSLC-5T1Loopback ResponseDS0 DP #1 DS0 DP #2 DS0 DP #3 OCUTest SetIDSL OCU-RADTRAN U-BR1TEBidirectionalloopbackFigure 8. ADTRAN U-BR1TE BidirectionalLoopback

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