Re: Why won't my phone ring?

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Article #71341

#71341

From: Thomas D.G. Sandford
Date: Wed, 06 Dec 1995 00:00

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Anthony R. Gold (tgold@microvst.demon.co.uk) wrote:

: 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.

Or even some legal modems - notably the Motorola 3400 (although in all
other respects it is a nice piece of kit).

--
Thomas Sandford | t.d.g.sandford@prds-grn.demon.co.uk

Paradise Green Technical Services: Software/Hardware Design
                                   and Theatre Technical Services

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<817734930.24389@greenhow.demon.co.uk> <30be42f9.2604653@pubnews.demon.co.uk> <817814338snz@dktower.demon.co.uk> <30bf75f4.1645772@disrupt.demon.co.uk> <818059629snz@bitmap-brothers.co.uk> <818072324snz@microvst.demon.co.uk>

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From: t.d.g.sandford@prds-grn.demon.co.uk (Thomas D.G. Sandford)
Subject: Re: Why won't my phone ring?
Date: 1995/12/06
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