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ISDN Internal extension wiring

ISDN Internal extension wiring

(OP)
I have a BCM 400 that I want to run ISDN extensions from. The problem is we don't have Cat5 running from the BCM to where we want the ISDN to terminate. We do however have a 20 pair phone cable running there with spare pairs.

Can someone please tell me what pins need to be connected on a voice patch panel to carry an ISDN line? And will we need any fancy termination kit?

RE: ISDN Internal extension wiring

If the circuit is anISDN PRI (T1) it uses 2 pair, same as a standard T1 (1,2 and 4,5) requiring an 8 pin plug or jack. If it is just an ISDN line it only uses 1 pair (4,5) which is the middle pins of either an RJ11 or RJ45 plug or jack. Let me know if this helped. Thanks.

RE: ISDN Internal extension wiring

(OP)
Thanks for the info. The line is from an internal phone system (nortel BCM) and should be just basic ISDN BRI (128k).

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