Path: utzoo!utgpu!jarvis.csri.toronto.edu!rutgers!netsys!vector!telecom-gateway From: hobbit@topaz.rutgers.edu (*Hobbit*) Newsgroups: comp.dcom.telecom Subject: Re: Flash Hook & Line Disconnect Message-ID: Date: 5 Jul 89 22:46:35 GMT Sender: news@vector.Dallas.TX.US Lines: 21 Approved: telecom-request@vector.dallas.tx.us X-Submissions-To: telecom@eecs.nwu.edu X-Administrivia-To: telecom-request@vector.dallas.tx.us X-TELECOM-Digest: volume 9, issue 224, message 8 of 11 DMS switches seem to have excessively "safe" ways to deal with what they consider error conditions. Lots of up-and-down on the hookswitch is apparently interpreted as something wrong with the line or instruments, and one attempted corrective action is to remove the line voltage completely for a while with the hope that whatver's causing the problem out there will eventually reset itself and be quiet. My office [Dunellen NJ] does the same thing. I discovered this while playing around with my series-resistance feature, that simply increases the DC resistance of the phone until the line card gives up. With older offices the finder used to go crazy, and oscillate back and forth. The DMS cards have hysteresis, so if you turn this thing down until it disconnects you have to turn it up a ways again to get the dialtone back. What really annoys me is the automatic diagnostics the office does around 2am every night. My fone is such that significant DC variations on one line seriously affect a modem on the other line -- admittedly a design flaw in the fone, but I know it also annoys lots of people out there who have the cheap little ringer circuits that click and chirp when this sort of thing is going on... _H*