From owner-freebsd-current Thu Feb 24 11: 7:49 2000 Delivered-To: freebsd-current@freebsd.org Received: from khavrinen.lcs.mit.edu (khavrinen.lcs.mit.edu [18.24.4.193]) by hub.freebsd.org (Postfix) with ESMTP id 61A7037C183 for ; Thu, 24 Feb 2000 11:07:44 -0800 (PST) (envelope-from wollman@khavrinen.lcs.mit.edu) Received: (from wollman@localhost) by khavrinen.lcs.mit.edu (8.9.3/8.9.3) id OAA27437; Thu, 24 Feb 2000 14:07:40 -0500 (EST) (envelope-from wollman) Date: Thu, 24 Feb 2000 14:07:40 -0500 (EST) From: Garrett Wollman Message-Id: <200002241907.OAA27437@khavrinen.lcs.mit.edu> To: Chris Wasser Cc: freebsd-current@FreeBSD.ORG Subject: Re: dc0 wierdness with Compex Freedomline In-Reply-To: <20000224102131.A1796@area51.v-wave.com> References: <20000224120438.A24299@shadowmere.student.utwente.nl> <20000224102131.A1796@area51.v-wave.com> Sender: owner-freebsd-current@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG < said: > The theoretical maximum for 100BaseT-FDX (which is 200Mbps) is 25MB/s > (megabytes per second), 100BaseT-TX is 12MB/s [FYI: Mbps->MB/s you divide > by 8] I realize my punctuation may be off, but there you are. Assuming you mean ``100BASE-T (half duplex)'' here... This is not quite right. In a CSMA/CD medium access protocol, like that used by Ethernet, the actual capacity of the link is always(*) somewhat less than 100%; the exact value depends on the precise parameters of the transmissions at both ends.(**) -GAWollman (*)In non-trivial conditions; i.e., when actual work is being done. (**)I've heard numbers between 70% and 95%. -- 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, CRS, or NSA| - Susan Aglukark and Chad Irschick To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message