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From: mitel!spock!grayt@uunet.uu.net (Tom Gray)
Newsgroups: comp.dcom.telecom
Subject: Re: What is "Supervision"?
Message-ID: <14206@accuvax.nwu.edu>
Date: 31 Oct 90 16:09:58 GMT
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Reply-To: Tom Gray <mitel!smithd!grayt@uunet.uu.net>
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X-Telecom-Digest: Volume 10, Issue 779, Message 6 of 13


In article <14174@accuvax.nwu.edu> you write:

>I think many TELECOM Digest postings would become clear to me if I
>just understood one jargon word.

>What is meant by "supervision?"

Control information is sent two ways on a telephone loop.  Outgoing
(ie from telephone to CO/PBX or the originating side of a trunk), its
called signalling. Incoming (ie from CO/PBX to telephone or the
terminating side of a trunk its called SUPERVISION. There is a special
type of supervision called answer supervision, which indocates that
the called end has answered and the call is completed and later that
the called end has released.

Hope this helps - forward and back - siganlling and supervision.