🚀 go-pugleaf

In article <818059629snz@bitmap-brothers.co.uk>
           SteveC@bitmap-brothers.co.uk "Steve Cargill" writes:

> Thats what I thought!  The wire from the outside world is 2 core, so
> when I re-wired the phones in my house, I used 2&5.  It worked great
> until a few days later my wife told me the phones upstairs wern't
> ringing.  Only the phone plugged into the master socket.  After a bit
> of playing around I found that 3 on all the sockets needed to be
> connected together to make extensions ring.  I belive it's got something
> to do with the ring capaciter in the M/S.
> 
> Anybody know more?

The ring voltage is separated from the voice/DC pair at the master jack
and the ring voltage is presented to a BABT phone/modem/fax etc on pin
3.  I think it was a BT solution to stop the LD pulses from rotary dials
from tinkling the local bells, but others may know the history better.
Anyway, US non-BABT equipment will work fine as the ring voltage is still
present on the main pair.  The problem folks often have is that a BABT 
phone daisy-chained throught an illegal modem will be bell-dead as the 
third wire will not be passed on.

Regards,
-- 
   Tony - G3SKR / AA2PM                  email: tgold@panix.com
                                                tgold@microvst.demon.co.uk
                                        packet: g3skr@n0ary.#nocal.ca.usa.na