From owner-freebsd-current Fri Nov 1 07:08:08 1996 Return-Path: owner-current Received: (from root@localhost) by freefall.freebsd.org (8.7.5/8.7.3) id HAA10943 for current-outgoing; Fri, 1 Nov 1996 07:08:08 -0800 (PST) Received: from halloran-eldar.lcs.mit.edu (halloran-eldar.lcs.mit.edu [18.26.0.159]) by freefall.freebsd.org (8.7.5/8.7.3) with SMTP id HAA10930 for ; Fri, 1 Nov 1996 07:08:04 -0800 (PST) Received: by halloran-eldar.lcs.mit.edu; (5.65v3.2/1.1.8.2/19Aug95-0530PM) id AA28746; Fri, 1 Nov 1996 10:07:17 -0500 Date: Fri, 1 Nov 1996 10:07:17 -0500 From: Garrett Wollman Message-Id: <9611011507.AA28746@halloran-eldar.lcs.mit.edu> To: Greg Lehey Cc: joerg_wunsch@uriah.heep.sax.de, FreeBSD-current@FreeBSD.org (FreeBSD current users), isdn@muc.ditec.de (FreeBSD ISDN Distribution List) Subject: Re: Any ISDN-BRI cards work under FreeBSD? In-Reply-To: <199611010828.JAA19837@freebie.lemis.de> References: <199610311858.TAA16867@uriah.heep.sax.de> <199611010828.JAA19837@freebie.lemis.de> Sender: owner-current@FreeBSD.org X-Loop: FreeBSD.org Precedence: bulk < said: > The good news, however, is that 56 kb/s is not the only game in town. > It was only ever intended as an interim measure, and many areas supply > 64 kb/s. Could somebody in the US please comment? Most interoffice trunks in the US no longer use in-band signalling, so most ISDN-capable end offices will deliver a full 64-kb data path, and data calls are supposed to fail if there is not a 64-kb path. Voice calls will still succeed, with the missing bit thrown out (I think it gets forced to zero by the time you see it). The 56-kb service was only ever used for old, voice-engineered T-1 trunks, which did not have any sort of signalling associated with them. As more and more of the network has switched to SS#7, this has been rapidly disappearing, and now interoffice signalling is sent on a separate trunk. You can check the archives of TELECOM Digest for more information on this topic. -GAWollman -- Garrett A. Wollman | O Siem / We are all family / O Siem / We're all the same wollman@lcs.mit.edu | O Siem / The fires of freedom Opinions not those of| Dance in the burning flame MIT, LCS, ANA, or NSA| - Susan Aglukark and Chad Irschick