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Re: Silent Phones


  • To: ukha_d@xxxxxxx
  • Subject: Re: Silent Phones
  • From: Nigel Orr <nigel@xxxxxxx>
  • Date: Thu, 12 Oct 2000 08:57:40 +0100
  • Delivered-to: rich@xxxxxxx
  • Delivered-to: mailing list ukha_d@xxxxxxx
  • Mailing-list: list ukha_d@xxxxxxx; contact ukha_d-owner@xxxxxxx
  • Reply-to: ukha_d@xxxxxxx

At 21:33 11/10/00 +0100, you wrote:
>http://www.diyautomation.co.uk/projects/silent_phones.html

I thought it was going to be something more spectacular :-(

As I posted on Tuesday (Keith was probably too busy soldering up boards to
notice!), the problem with disconnecting pin3 is that some renegade phones
derive their own ring signal from pins 2 and 5 so that won't stop them
either.  These phones are the usual reasons for folk complaining that their
new extension wiring only rings some of their phones- they've forgotten pin
3...

I'd guess there is a way of actually suppressing the ring signal on pins
2-5 while the phone is on-hook without upsetting the exchange, by shunting
it with a suitable filter, and there might even be a simple way, but I
can't get my head round it this early in the morning... and it would have
to go before the master socket (assuming you have a phone plugged in to the
master socket) so it wouldn't be BT-friendly and would probably go pop in
the first nearby thunderstorm :-(

Nigel


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