Date: Sun, 28 Nov 1999 09:01:07 -0000 From: "Roger Hardiman" <roger@cs.strath.ac.uk> To: "Andrew Gordon" <arg@arg1.demon.co.uk> Cc: <isdn@freebsd.org> Subject: Re: Help - I need a login shell over my ISDN line Message-ID: <008501bf397f$fefbae00$0200000a@bfg>
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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
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