OT : RJ45 Telecom wiring
ploopster at gmail.com
Sun Oct 10 14:55:28 CDT 2010
Tony Duell wrote:
> Can anyone suggest URLs, etc that give the wiring of RJ45 sockets. in
> telecom applications. Not 10bse<n> (which from what I understand are not
> strictly RJ45's anyway), or ISDN, but older telecoms.
> The web pages I've found soe far give the wiring for up to 4 POTS lines
> on an RJ45, which is, again, not what I am looking for...
> In particular :
> What pins would I expect to find a normal 'switched' telephone line on (4
> and 5, I think?)
> What about a 2-wire leased line ('private circuit')? Or a 4-wire one?
> Why would there be a resistor of about 866 ohms connected between pins 7
> and 8?
> Why would pins 3 anf 6 be shorted together?
> In case anyone's wondering, I've bought a non-working telephone line
> simulator, and am trying to make sense of the numerous relays connected
> to the telephone connectors, which are RJ45s (genuine RJ45s, with the
> extra polarisation notch).
> Books on US telcoms practicce are few and far between over here...
> Thanks in advance for any help...
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