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The UKHA-ARCHIVE IS CEASING OPERATIONS 31 DEC 2024


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Re: Silent Phones


  • To: ukha_d@xxxxxxx
  • Subject: Re: Silent Phones
  • From: "Patrick Lidstone" <patrick@xxxxxxx>
  • Date: Thu, 12 Oct 2000 10:28:53 -0000
  • 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

> I presume, as you know more about these things than I, that my idea
of
> shunting the ring signal only but still passing CLID wouldn't be
> achievable?  I thought they might be far enough apart in frequency
that you
> could reduce the ring signal on 2&5 enough with a simple filter to
stop
> phones ringing, without blocking the CLID data?

CLID data is pretty sensitive to line loading IME.

> What's the detail of the ring signal- is it 90V rms @16.3 Hz?
What's the
> CLID- 9600 baud data?  Just pondering...

2400 baud. (I'm 90% sure - the other 10% favours 1200 baud. There's a
publically available SIN if you're really interested).

Patrick


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