TELECOM Digest OnLine - Sorted: Re: I Have a Telephony Mystery :-)

Re: I Have a Telephony Mystery :-)

Dave Garland (
Thu, 05 Jul 2007 19:46:32 +0000

It was a dark and stormy night when Jeremy Morton <> wrote:

> Trouble with getting such splitters as RJ14s (4 pins) instead of RJ11s (2
> pins) is they're damn-near impossible to find. In the form-factor I need,
> anyway. And I don't want to buy one unless someone can explain to me why
> the 4 pins are needed. Any help appreciated.

If you're plugging a modem into it, you don't need the outside pins.
Most phones that will plug into it don't need (or use) those pins

In the USA, those pins would be for a second phone line using the same
4-wire building wiring. There are 2-line telephones that make use of
all 4 wires. There are splitters that take one 4-wire plug and turn
it into two independent 2-wire receptacles (each a different line). I
don't know anything about UK telephones, but I'd guess that if you
only have one line, all of that is irrelevant to your usage.


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