From owner-freebsd-isdn Sun Nov 28 1: 7:17 1999 Delivered-To: freebsd-isdn@freebsd.org Received: from fleming.cs.strath.ac.uk (fleming.cs.strath.ac.uk [130.159.196.126]) by hub.freebsd.org (Postfix) with ESMTP id 55F5214E1A for ; Sun, 28 Nov 1999 01:07:10 -0800 (PST) (envelope-from roger@cs.strath.ac.uk) Received: from bfg (scary.dmem.strath.ac.uk [130.159.202.5]) by fleming.cs.strath.ac.uk (8.8.8/8.8.8) with SMTP id JAA24604 Sun, 28 Nov 1999 09:07:04 GMT Message-ID: <008501bf397f$fefbae00$0200000a@bfg> From: "Roger Hardiman" To: "Andrew Gordon" Cc: Subject: Re: Help - I need a login shell over my ISDN line Date: Sun, 28 Nov 1999 09:01:07 -0000 MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 4.72.3110.1 X-MimeOLE: Produced By Microsoft MimeOLE V4.72.3110.3 Sender: owner-freebsd-isdn@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org Hi >Note however that none of this is ever "end-to-end" ISDN. You are always >running a GSM protocol over the wireless link, which implements a >bytestream (or bitstream if synchronous mode), and then connects to a >modem or TA at the MSC. Ok. >>From an I4B point of view, the hard part is not implementing the protocols >themselves, but the infrastructure to support them: Rec. V.120 itself is >only 36 pages, and the code to do HDLC over the B channel already exists >for other other purposes in I4B. The major stuff to write is the tty >handling, call set-up control etc. > >In BISDN, there was a skeleton of this, doing all the work in the >kernel. However, it occurs to me that you might be able to save a lot of >work by doing it as a daemon: you can get all the tty stuff by sitting on >the back end of a pty, and you can probably get most of the ISDN interface >out of the RBCH stuff that /usr/sbin/ppp has recently started using: it >needs to do much the same work (exchanging HDLC frames over the B channel, >dialling calls etc.). > I was thinking of opening the Raw B channels in a userland daemon support the protocols too and had looked at Brian's PPP code. Currently I'm not sure if we will have any time to devote to a v.110 or v.120 implementation. I'll know more when I see this GSM Next Generation HSCSD mobile phone next week after TMA32 Roger To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-isdn" in the body of the message