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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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