Path: utzoo!utgpu!jarvis.csri.toronto.edu!cs.utexas.edu!mailrus!accuvax.nwu.edu!nucsrl!telecom-request
From: jason@cnd.hp.com (Jason Zions)
Newsgroups: comp.dcom.telecom
Subject: Re: A Few ISDN Questions
Message-ID: <4671@accuvax.nwu.edu>
Date: 2 Mar 90 20:08:12 GMT
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X-Telecom-Digest: Volume 10, Issue 139, Message 7 of 10


Okay, so a B channel is raw 64kb/s. Is there any way to signal,
end-to-end, the higher-level meaning imposed on those bits? For
example, if I attach a Fax machine to an ISDN line and place a call,
can the receiving end get some indication on the D channel that the
incoming call is facsimile?

If I place a call through ISDN, I understand that the dialing
information goes across the D channel to do call setup and all that
other junk. Is it possible to send other setup information end-to-end
through D channel? The idea would be that the 2B+D line gets plugged
into a really smart box. When a call comes in, the smart box knows
what data is about to come in on the B channel; fax, voice, data, slow
video, etc. It then connect the B channel to the appropriate device
(if present) or rejects the call (if there's no such device present).


Jazz