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From: john@bovine.ati.com (John Higdon)
Newsgroups: comp.dcom.telecom
Subject: Re: AT&T Multi-line Cordless Telephones
Message-ID: <2194@accuvax.nwu.edu>
Date: 15 Dec 89 07:28:20 GMT
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X-Telecom-Digest: Volume 9, Issue 575, message 12 of 13


Doug Faunt N6TQS 415-688-8269 <faunt@cisco.com> writes:

> The electronic phones on an AT&T System 75 can use up to 4 pair.  If
> it's a hybrid phone they use one pair for analog, one pair for digital
> in, one pair for digital out, and if it's running an accessory, like a
> speakerphone another pair for distributing central power.  If you have
> no accessories the power pair is unnecessary (this can also be handled
> by having a PS local to the device).  If you're using a digital set,
> then the analog pair is not necessary.

But why, Why, WHY, can't they put data send, data receive, and power
on ONE pair? Every other manufacturer in the known civilized world
seems to be able to do this. An exception is Mitel, who puts analog
voice (full duplex), send data, receive data, and power over A SINGLE
PAIR.

The question wasn't "what is on the pairs", but rather "why do they
have to use so many when others don't for the same amount of
information conveyance"?


        John Higdon         |   P. O. Box 7648   |   +1 408 723 1395
    john@bovine.ati.com     | San Jose, CA 95150 |       M o o !