From owner-freebsd-isdn Mon Oct 16 9:58:54 2000 Delivered-To: freebsd-isdn@freebsd.org Received: from smtp1.nikoma.de (smtp1.nikoma.de [212.122.128.19]) by hub.freebsd.org (Postfix) with ESMTP id 56A0437B670 for ; Mon, 16 Oct 2000 09:58:47 -0700 (PDT) Received: from pop1.nikocity.de (pop1.nikocity.de [212.122.128.209]) by smtp1.nikoma.de (8.9.3/8.9.3) with ESMTP id SAA39466 for ; Mon, 16 Oct 2000 18:58:42 +0200 (CEST) (envelope-from mreckt@nikocity.de) Received: from mreckt.nikocity.de (root@dialin214.pg2.hamburg.nikoma.de [213.54.1.214]) by pop1.nikocity.de (8.9.3/8.9.3) with ESMTP id SAA23764 for ; Mon, 16 Oct 2000 18:58:41 +0200 Received: (from mreckt@localhost) by T-Rex.jurassic.parc (8.9.3/8.9.3) id SAA00334 for isdn@freebsd.org; Mon, 16 Oct 2000 18:57:30 +0200 Date: Mon, 16 Oct 2000 18:57:30 +0200 From: Martin Recktenwald To: isdn@freebsd.org Subject: Re: error messages... Message-ID: <20001016185730.B267@nikocity.de> Reply-To: mreckt@cs.uni-sb.de References: <20001014101345.BD66F9B20@bert.kts.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.1.8i In-Reply-To: ; from arg@arg1.demon.co.uk on Sun, Oct 15, 2000 at 11:04:52PM +0100 Sender: owner-freebsd-isdn@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org On Sun, Oct 15, 2000 at 11:04:52PM +0100, Andrew Gordon wrote: > > I also note that AVM cards I've bought recently have had extremely long > cords with them (about 6m long!): even with a correctly terminated bus, > plugging one of these long cords into the middle may be enough to cause > unacceptable reflections. > Only if there is something else wrong. 10m for connection cords is allowed even in the worst case (~ 100m bus length), more might work in many cases. > > > I have been told that the NT can be switched into 'high power' > > > mode to allow for longer cable runs > > It's not high power, it's a timing adjustment. But it only applies to the > case of a single device at the end of a very long run (up to 800m); not > for multiple devices. This is the switch labelled "S" and "L" (for > "short" and "long") under the cover of the BT NTE8A. Should be in the > "S" position for all normal uses. > This switch is probably for the "Extended passive bus" described in A.2.1.2/ETS300012-1. It *does* allow multiple devices, but they have to be grouped at the end of the bus, it looks like this: |--+--+--+---------------------------NTBA| TE TE TE Martin. -- PGP key at http://www-wjp.cs.uni-sb.de/~mreckt/keys.html To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-isdn" in the body of the message