Date: Fri, 26 Oct 2001 20:19:40 +0200 (CEST) From: hm@kts.org (Hellmuth Michaelis) To: Andrew Gordon <arg-bsd@arg1.demon.co.uk> Cc: Martin Husemann <martin@duskware.de>, freebsd-isdn@FreeBSD.ORG Subject: Re: RFC1974 (STAC) Message-ID: <20011026181940.1EA51F9C4@bert.kts.org> In-Reply-To: <20011026132510.N36971-100000@server.arg.sj.co.uk>
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> > Excuse me if I'm a bit behind with reality (in catch-up mode now) - I just > > noticed one of the big german ISPs, t-online, now offers STAC compression > > (RFC 1974) for their ISDN access. Do we have support for that already? Anyone > > looked at it? > > I don't know of implementation for use with I4B. Dito. > The information necessary to implement it is publicly available - RFC1974 > gives the PPP packet encapsulation, and the compression algorithm itself > is in X3.241, available from ANSI (it's only 14 pages). > > There appears to be a linux implementation (I've not tried it): > > http://www.ibh.de/~beck/stuff/lzs4i4l/ A year or so ago i had a look at it, it looked not bad but it is _VERY_ Linux kernel specific so i just gave up after some time .... The code seems to be documented good, there are masses of comments in it IIRC. The author was very responsive, i asked a few questions about the code and if he had any difficulties re. the patented status (he had not at that time). > However, STAC holds patents on the compression algorithm, so the legal > status of any implementation would be questionable. I consider it not only questionable but highly questionable. On the other side it would be a good thing to have it for the kernel sppp interfaces and i always think that if i have some more spare time when i'm old and grey, i will look at it again :-) hellmuth -- Hellmuth Michaelis hm@kts.org Hamburg, Europe We all live in a yellow subroutine, yellow subroutine, yellow subroutine ... To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-isdn" in the body of the message
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