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From: floyd@hayes.ims.alaska.edu (Floyd Davidson)
Newsgroups: comp.dcom.telecom
Subject: Re: Distinctions and Definitions Needed
Message-ID: <14055@accuvax.nwu.edu>
Date: 26 Oct 90 13:09:18 GMT
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X-Telecom-Digest: Volume 10, Issue 765, Message 7 of 9


In article <14030@accuvax.nwu.edu> George S Thurman <0004056081@
mcimail.com> writes:

>Could some of you Telecom Experts out there tell me (in simple terms)
>the difference between SS7 and CCIS.

CCS (Common Channel Signaling) removes the signaling functions from
the individual trunks (ie.  multifreq tones for dialing numbers) and
instead routes the information over a separate data link.  The data
link does not go from one switch to another directly, but instead each
switch is linked to a control point (an STP, Signal Transfer Point)
where a computer interprets the data and sends approriate commands to
each switch involved in a particular connection.

CCIS (Common Channel Interoffice Signaling) is AT&T's implementation
of CCS.

CCITT Signaling System No. 7 is the most recent CCS implementation.

SS7 provides more information to the terminating end office and does
more trunk testing before setting up a path.


Floyd L. Davidson   floyd@hayes.ims.alaska.edu    floydd@chinet.chi.il.us
Salcha, AK 99714    connected by paycheck to Alascom, Inc.
When *I* speak for them, one of us will be *out* of business in a hurry.