From owner-freebsd-hackers Sat Jul 17 4:30:27 1999 Delivered-To: freebsd-hackers@freebsd.org Received: from tele-post-20.mail.demon.net (tele-post-20.mail.demon.net [194.217.242.20]) by hub.freebsd.org (Postfix) with ESMTP id 3729B14D47 for ; Sat, 17 Jul 1999 04:30:23 -0700 (PDT) (envelope-from dmlb@ragnet.demon.co.uk) Received: from ragnet.demon.co.uk ([158.152.46.40]) by tele-post-20.mail.demon.net with esmtp (Exim 2.12 #2) id 115Sfd-0008pb-0K; Sat, 17 Jul 1999 11:30:22 +0000 Received: from dmlb by ragnet.demon.co.uk with local (Exim 2.12 #1) id 115RsV-000Lhy-00; Sat, 17 Jul 1999 11:39:35 +0100 Content-Length: 1098 Message-ID: X-Mailer: XFMail 1.3 [p0] on FreeBSD X-Priority: 3 (Normal) Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 8bit MIME-Version: 1.0 In-Reply-To: <199907162355.QAA22402@apollo.backplane.com> Date: Sat, 17 Jul 1999 11:39:35 +0100 (BST) From: Duncan Barclay To: Matthew Dillon Subject: Re: poor ethernet performance? Cc: hackers@FreeBSD.ORG, crypt0genic , Bill Paul , Vincent Poy Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG On 16-Jul-99 Matthew Dillon wrote: > > In regards to audio/video verses ethernet, you have to remember that > audio and video are *analog*, not digital. The cable quality matters > for analog, but it only needs to be "good enough" for digital. If you > don't get any bit errors (and you shouldn't) then a better cable is not > going to make a difference. > > -Matt > Matthew Dillon And you seen the nice square waves of 100Mb or !Gb ether on a line then? The techniques used for transmitting 100Mb/s down copper are certainly not digital. Pulse shaping, line estimation, ISI removal are all analogue! The cable itself is less improtant than the impedance matching at connectors and bends in the cable. Duncan --- ________________________________________________________________________ Duncan Barclay | God smiles upon the little children, dmlb@ragnet.demon.co.uk | the alcoholics, and the permanently stoned. ________________________________________________________________________ To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message