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From: hpubvwa!ssc!Tad.Cook@beaver.cs.washington.edu
Newsgroups: comp.dcom.telecom
Subject: Re: Ringing Nuisance
Message-ID: <13488@accuvax.nwu.edu>
Date: 11 Oct 90 05:28:47 GMT
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X-Telecom-Digest: Volume 10, Issue 732, Message 3 of 11


In article <13161@accuvax.nwu.edu>, SYSMATT@ukcc.uky.edu (Matt
Simpson) writes:

> Ever since my CO cut over to an ESS (I don't know what model), I have
> occasionally been awakened by a brief jingle of my phone's ringer at
> about 6 AM. 

> Short of unplugging my phones at night, does anyone have any idea how
> I can prevent this ringing, or how I can persuade South Central Bell
> that is something they can and should fix?


The CO doesn't actually put ringing voltage on your line.  But your
phone is seeing a sudden change in DC voltage, and is mis-interpreting
that as ringing voltage.  This is similar to the problem where you
have a rotary dial extension telephone which causes other phones on
the line to ring slightly while it is being dialed.  This is called
"bell tap", and should not happen in properly designed ringers.

Unfortunately, many manufacturers don't test for belltap anymore.

But a solution would be to find phones that are not bothered by
belltap.  I have noticed the same ringing from my 5ESS in the wee
hours, but it only happens on my one phone that is belltap sensitive.


Tad Cook   Seattle, WA   Packet: KT7H @ N7HFZ.WA.USA.NA  Phone: 206/527-4089 
MCI Mail: 3288544        Telex: 6503288544 MCI UW  
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