Path: utzoo!news-server.csri.toronto.edu!cs.utexas.edu!uunet!bu.edu!telecom-request From: Barton.Bruce@camb.com (Barton F. Bruce) Newsgroups: comp.dcom.telecom Subject: Re: An Old Instrument Develops Bell-Tap Message-ID: Date: 4 Mar 91 07:09:35 GMT Sender: news@bu.edu.bu.edu Organization: Cambridge Computer Associates, Inc. Lines: 33 Approved: Telecom@eecs.nwu.edu X-Submissions-To: telecom@eecs.nwu.edu X-Administrivia-To: telecom-request@eecs.nwu.edu X-Telecom-Digest: Volume 11, Issue 181, Message 2 of 9 In article , tots!tots.Logicon.COM! tep@ucsd.edu (Tom Perrine) writes: > so, it has developed what sounds like bell-tap; when you dial, the > ringer makes one "ding" for every pulse in the number. When an > extension was added (by TPC), we discovered that dialing the extension > (a cordless, set to pulse-dial) also causes the original phone to > "ding". > Is this "bell-tap"? Yes. > Is it a matter of reversing the polarity on the pair, The biased ringers are most immune to tap when connected properly across the line. (Keeping it simple...) the green cord wire should go to the line wire that is + (on any el-cheapo vom) in relation to the other wire. > or is it due to wear in the electro-mechanical ringer? After > thirty years, I would assume that it could be a *little* out of > adjustment :-). Not much wear likely, but the little spring hooks in different notches. If set way up high, the bell may not ring if the loop is very long. If set too weak, the bell will tap especially on short loops (where there is plenty of power to ring with the spring set stiff). BTW, I assume that TT/DP extension has been tried in TT mode even if you don't pay for the service.