76 Configuring ISDN BRI hardwareNote 1: Power Source 1 (PS1): Up to 2 Watts of power is supplied bythe SILC to the terminals on the DSL. This power is simplexed over theTX and RX pairs provided by -48 V (-40 V for Europe) supply on theSILC. The RX pair is positive with respect to the TX pair.Note 2: Power Sink 2 (PS2) provides an optional means of poweringthe terminal from a common supply in the wiring closet.Note 3: Power Source 3 (PS3) provides the power from the terminal tothe NT1 if the NT1 does not have a local power source.U interface specificationThe U interface uses a 2-conductor, twisted pair cable terminated withan RJ-45 type jack. An RJ-45 type jack on the NT1 device connects theterminal to the DSL using this twisted pair cable.The connector pin assignments for the jack and the plug are shown in Table18 "U interface connector specification" (page 76). The table also showssignal names for each interface pin at the UILC and at the terminal.Table 18U interface connector specificationPin numberRJ45 jackpin signal nameUILCsignal name1 Not used No connection2 Not used No connection3 Not used No connection4 Tip or Ring Tip or Ring5 Tip or Ring Tip or Ring6 Not used No connection7 Not used No connection8 Not used No connectionProcedure 23Connecting the ISDN BRI terminals to the DSLStep Action1 Plug one end of the modular cable into the ISDN BRI interfaceconnector on the terminal. Plug the other end of the modular cableinto the telephone outlet.2 If the SILC S/T interface has an optional auxiliary power source,plug the power source into the wall outlet and then the 10-m (33-ft)modular cable into the power source’s RJ-45 type jack.Nortel Communication Server 1000ISDN Basic Rate Interface Installation and CommissioningNN43001-318 01.02 StandardRelease 5.0 20 June 2007Copyright © 2003-2007, Nortel Networks.
