OT : RJ45 Telecom wiring

[Sridhar Ayengar]

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...

Try:  http://www.hvs.on.ca/telecom/technologies

Peace...  Sridhar