john@mojave.ati.com (John Higdon) (11/29/90)
Eric THOLOME <tholome@portia.stanford.edu> writes: > My answering machine (Panasonic) has a switch which I should set to A > if I don't use Call Waiting service, and B otherwise. Does anybody > know what the precise difference is ? 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 hanging up on a caller who is leaving a message if someone else happens to call at the same time. The shorter one will allow the machine to hang up at the slightest loop twitch and has the advantage of instantly disconnecting at the moment the caller hangs up. All of the above mainly deals with 1/1AESS switches. Most digital switches have no loop signal (CPC) on call waiting and you may set the switch to the non-call waiting position. John Higdon <john@bovine.ati.com> (hiding out in the desert)
dave@westmark.westmark.com (Dave Levenson) (12/04/90)
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 Voice: 908 647 0900 Fax: 908 647 6857