Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.2 9/5/84; site python.UUCP Path: utzoo!watmath!clyde!burl!ulysses!gamma!epsilon!zeta!sabre!python!smk From: smk@python.UUCP (S.Kuzyszyn) Newsgroups: net.research,net.dcom,net.lan Subject: Re: ISDN-LAN Gateway Development Message-ID: <143@python.UUCP> Date: Mon, 24-Jun-85 07:47:23 EDT Article-I.D.: python.143 Posted: Mon Jun 24 07:47:23 1985 Date-Received: Tue, 25-Jun-85 07:43:40 EDT References: <258@dcl-cs.UUCP>, <1499@ecsvax.UUCP> Organization: Bell Communications Research Lines: 26 Xref: watmath net.research:182 net.dcom:1053 net.lan:887 ISDN as defined for Basic and Primary access allows for two general types of connections: B-channel and D-channel connections. The B channel is a circuit switched channel that supports a 64 kb clear channel. This could be used for packet data between two packet switches (gateway style). In this case any protocol will do (since it is just a bit pipe, but obviously the protocols should be compatible at both ends of the pipe). The other type, a D-channel connection, supports packet data over a 16 kb (basic access), or 64 kb (primary access) channel. Because this D-channle is also used for signaling messages (e.g. for setting up B-channel connections) the entire capacity is not available for packet data (in fact, a priority scheme can give preference to the signaling messages on the D-channel). To get to the point, the D-channel will support X.25 connections at level 3 and so can be used a gateway.