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From: dave%westmark@uunet.uu.net (Dave Levenson)
Newsgroups: comp.dcom.telecom
Subject: What Kind of Switch is This?
Message-ID: <11794@accuvax.nwu.edu>
Date: 6 Sep 90 12:25:17 GMT
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X-Telecom-Digest: Volume 10, Issue 623, Message 2 of 11


A customer has a loop-start CO line (it happens to be the first in a
small hunt-group) where outgoing service is normal.  On incoming
calls, the caller hears the ringback tone, but no ringing voltage at
all is delivered to the line.  Listening with a butt set (in monitor
mode) when an incoming call is attempted, one hears absolutely nothing
 ... no clicks, no tones, and no ring power.  But switch to talk mode,
and you answer the incoming call and can converse with the caller.  If
the first line is in use, calls hunt to other members of the group,
and those lines ring normally.  I wonder if the CO is administered
with none of the possible ringing options selected?  (No, it's not tip
party, it's not ring party, it's not bridged ringing, etc.  None of
the above?  Don't ring at all!)

The CO is probably a digital time-division switch of some kind, as
there are no audible clicks or loop current interruptions when calling
out.  The access code is 516-234.  The customer's site is in Central
Islip, New York (which is on Long Island).

Has anybody ever heard of this failure mode?  Does anybody know the
type of CO used by New York Telephone in those parts?

The telco has promised to have somebody out today to look at the
problem.  I suggested to the repair bureau agent that they ought to
look at the CO first, as the loop works normally for outgoing service,
but what do _I_ know about it?


Dave Levenson			Voice: 908 647 0900  Fax: 908 647 6857
Westmark, Inc.			UUCP: {uunet | rutgers | att}!westmark!dave
Warren, NJ, USA			AT&T Mail: !westmark!dave