Date: Sat, 10 Aug 1996 10:38:45 +0200 (MET DST) From: J Wunsch <j@uriah.heep.sax.de> To: freebsd-hackers@freebsd.org (FreeBSD hackers) Cc: scrappy@ki.net Subject: Re: ISDN Recommendations Requested... Message-ID: <199608100838.KAA07513@uriah.heep.sax.de> In-Reply-To: <Pine.SV4.3.93.960810150149.26799B-100000@parkplace.cet.co.jp> from Michael Hancock at "Aug 10, 96 03:10:59 pm"
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As Michael Hancock wrote: > The BISDN stuff is for a TELES card that seems to only support the German > and maybe other European tel comm interfaces. There are actually two problems here: The Teles cards are cheap, so they are much more attractive to the average user here than more intelligent boards. However, the European Telco environment is largely different than that of the US. ISDN is being marketed as what it stands for: an _integrated_ solution, not just a data communications service. Thus, the NTBA (the adapter between the Uk0 line and the local S0 bus) is owned and installed by the Telco here, and every equipment you get operates on the S0 bus. The intended usage pattern is that you've got more than one device on this bus (e.g. a Teles board and some telephone equipment). The second problem is that ISDN technology has been pushed aggressively in Europe recently, in particular by the German Telekom. The European Telco's finally agreed on a common switch protocol, called DSS-1 (sometimes EDSS-1, to refer to it as the European protocal, the term ``Euro-ISDN'' is also in use), while i think that the US Telco's are still a few miles away from this point. BISDN also still supports the old German 1TR6 switch protocol, but this one is considered rather obsolete these days, and is mainly uses in in-house circuits, where the vendors of the communication equipment have not moved towards EDSS-1 (even though they have to support it on the outside connection). Any support for other switch protocols in BISDN will certainly have to be integrated by people who have actually got access to it (and who have a fairly well knowledge about the ISDN protocol itself). Hellmuth Michaelis ensured me that the architecture is believed to allow for the easy addition of other switch protocol implementations. -- cheers, J"org joerg_wunsch@uriah.heep.sax.de -- http://www.sax.de/~joerg/ -- NIC: JW11-RIPE Never trust an operating system you don't have sources for. ;-)
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