From owner-freebsd-isdn Sun Jan 24 09:57:21 1999 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.8/8.8.8) id JAA28062 for freebsd-isdn-outgoing; Sun, 24 Jan 1999 09:57:21 -0800 (PST) (envelope-from owner-freebsd-isdn@FreeBSD.ORG) Received: from whistle.com (s205m131.whistle.com [207.76.205.131]) by hub.freebsd.org (8.8.8/8.8.8) with ESMTP id JAA28057 for ; Sun, 24 Jan 1999 09:57:20 -0800 (PST) (envelope-from archie@whistle.com) Received: (from smap@localhost) by whistle.com (8.7.5/8.6.12) id JAA29647; Sun, 24 Jan 1999 09:57:05 -0800 (PST) Received: from bubba.whistle.com( 207.76.205.7) by whistle.com via smap (V2.0) id xma029645; Sun, 24 Jan 99 09:56:47 -0800 Received: (from archie@localhost) by bubba.whistle.com (8.8.7/8.6.12) id JAA28209; Sun, 24 Jan 1999 09:56:47 -0800 (PST) From: Archie Cobbs Message-Id: <199901241756.JAA28209@bubba.whistle.com> Subject: Re: I4B support for US ISDN? In-Reply-To: <36AB119D.553C5A99@gmx.net> from Stefan Herrmann at "Jan 24, 99 01:27:09 pm" To: stefhe@gmx.net (Stefan Herrmann) Date: Sun, 24 Jan 1999 09:56:47 -0800 (PST) Cc: freebsd-isdn@FreeBSD.ORG X-Mailer: ELM [version 2.4ME+ PL38 (25)] MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: owner-freebsd-isdn@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org Stefan Herrmann writes: > > On the other hand, from Layer 3 point of view it shouldn't make > > any difference whether its S or U interface. > > What does S and U interface meen and what is the difference ? It's just some typical ITU language. The line that comes to your house ends in a U interface. If you stick an NT1 on it, then that converts the U into an S interface. The difference between the two is that only one device can connect to a U interface, whereas multiple devices (up to 8) can connect to an S interface. So the U is like the ISDN "WAN" interface, while the S (which is a bus) is like the "LAN" interface. -Archie ___________________________________________________________________________ Archie Cobbs * Whistle Communications, Inc. * http://www.whistle.com To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-isdn" in the body of the message