Date: Mon, 10 Feb 1997 09:05:42 +0100 (MET) From: hm@hcs.de (Hellmuth Michaelis) To: smp@csn.net (Steve Passe) Cc: Andrew.Gordon@net-tel.co.uk, hardware@FreeBSD.ORG, multimedia@FreeBSD.ORG Subject: Re: Re(2): isdn cards Message-ID: <m0vtqkA-0000EWC@hcswork.hcs.de> In-Reply-To: <199702100104.SAA28311@clem.systemsix.com> from "Steve Passe" at "Feb 9, 97 06:04:05 pm"
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>From the keyboard of Steve Passe:
> Anyone care to speculate exactly how much work it would be to start
> with the existing BISDN driver and one of these cards and get to the
> point of having a working ISDN for FreeBSD solution?
In case you want to buy a Teles or AVM and use BISDN as a starting point,
you will have to add support for the North American Layer 3 protocol on
the D channel. Layer 1 and 2 should be the same as far as i know, but
Layer 3 seems to be special. BISDN already supports 2 of those protocols,
the old german-special 1TR6 and the very common DSS1 or "Euro-ISDN" protocol.
> Where could one find the protocal specs for "the D channel"?
I have no idea, ask your ISDN/Telephone company. For DSS1 the relevant
standards are I.430 (Layer 1), Q.920/Q.921 (Layer 2) and Q.930/Q.931/Q.932
(Layer 3). They are sold by the ITU (www.itu.ch) but can also be found
for much less money on the Infomagic "Standards CDROM".
hellmuth
--
Hellmuth Michaelis HCS Hanseatischer Computerservice GmbH Hamburg, Europe
In their infinite wisdom, the folks at HP have decided that mere mortals
such as you and I don't need to know what the kernel's proc structure looks
like. (William LeFebvre, top 3.4 README, HP-UX 10.10)
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