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From: dave@westmark.westmark.com (Dave Levenson)
Newsgroups: comp.dcom.telecom
Subject: Re: Answering Machine and Call Waiting
Message-ID: <15216@accuvax.nwu.edu>
Date: 4 Dec 90 13:40:40 GMT
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X-Telecom-Digest: Volume 10, Issue 865, Message 5 of 13


In article <15093@accuvax.nwu.edu>, john@mojave.ati.com (John Higdon)
writes:

[ regarding the loop-disconnect-interval switch on a Panasonic
answering machine.]

> This is a loop current timing selector. It determines whether the
> answering machine will disconnect on a short loop current interruption
> or whether it requires a longer one. The longer one is used for
> call-waiting. This will prevent the machine from unceremoniously
 ...

On the 1AESS's here in NJ, a short ( < 100 msec) open-loop interval is
caused by call-waiting, and also by various call-state-changes that
occur during outbound call setup.

We get a 500 msec open-loop interval only when the far end
disconnects.

We strap our key telephone and PBX systems to recognize the long open
as a disconnect, and to ignore the shorter ones, when we use
loop-start trunks.

In the areas where we still have 5-Xbar, we strap the same devices to
recognize the short open loop (100 - 200 msec) as the disconnect
signal.  These switches don't generate the long interval.  (They also
don't offer call-waiting.)


Dave Levenson			Internet: dave@westmark.com
Westmark, Inc.			UUCP: {uunet | rutgers | att}!westmark!dave
Warren, NJ, USA			AT&T Mail: !westmark!dave
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