In article ,
Owain wrote:
| Only 3 is actually required as this is the shunt wire (bell).
| 4 is a local earth not used much - if at all - these days.
| Think it was for party lines.

It depends on whether you follow the BS or BT numbering whether the ring
is on 3 or 4.

Interesting. What's the BS numbering? And did it apply to domestic
installations?

The earth was used for earth recall on PABX. Line jack units were never
fitted on party lines.

Ok.

--
*Is it true that cannibals don't eat clowns because they taste funny?

Dave Plowman London SW
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