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000005_isdn-distribution-owner_Wed Jan 6 10:21:22 1993.msg
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Received: from nac.no ([129.240.2.40]) by relay.cs.toronto.edu with SMTP id <150197>; Wed, 6 Jan 1993 10:21:11 -0500
Received: from comix.atik.no by nac.no with SMTP (PP) id <26617-1@nac.no>;
Wed, 6 Jan 1993 14:49:27 +0100
X400-Received: by mta elc1.atik.no in /PRMD=uninett/ADMD= /C=no/; Relayed;
Mon, 30 Nov 1992 14:16:58 +0100
Date: Mon, 30 Nov 1992 08:16:58 -0500
X400-Originator: isdn-request@teknologi.agderforskning.no
X400-Recipients: non-disclosure:;
X400-MTS-Identifier: [/PRMD=uninett/ADMD= /C=no/;elc1.atik..777:30.10.92.13.16.58]
Priority: Non-Urgent
DL-Expansion-History: isdn@teknologi.agderforskning.no ; Mon, 30 Nov 1992
14:16:58 +0100;
From: s_silverman <s_silverman%W036_NW@nac.no>
Message-ID: <9211301316.AA14124@mwunix.mitre.org>
To: isdn@teknologi.agderforskning.no
Subject: D Channel Packet Mode
Return-Path: <s_silverman@mwmgate1.mitre.org>
D Channel packets are supposed to be connected to packet
networks and get anywhere they can be routed. The
limitation to one switch is an implementation/deployment
problem. So far, implementation of X.25 inside ISDN is
fairly pathetic and given the schedules for Frame Relay and
ATM, little more may be done.
There is no inherent 3 channel limitation on D channel
packet mode. All X.25 packets should have SAPI = 16 but
there is a 12 bit field called LCN (Logical Channel Number)
in the X.25 header, which allows enough virtual circuits for
the average user.
Steve Silverman silverma@mitre.org