From owner-freebsd-current Tue Oct 6 22:50:46 1998 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.8/8.8.8) id WAA14009 for freebsd-current-outgoing; Tue, 6 Oct 1998 22:50:46 -0700 (PDT) (envelope-from owner-freebsd-current@FreeBSD.ORG) Received: from rover.village.org (rover.village.org [204.144.255.49]) by hub.freebsd.org (8.8.8/8.8.8) with SMTP id WAA13996 for ; Tue, 6 Oct 1998 22:50:41 -0700 (PDT) (envelope-from imp@village.org) Received: from harmony [10.0.0.6] by rover.village.org with esmtp (Exim 1.71 #1) id 0zQmUG-0003nE-00; Tue, 6 Oct 1998 23:50:12 -0600 Received: from harmony.village.org (localhost.village.org [127.0.0.1]) by harmony.village.org (8.9.1/8.8.3) with ESMTP id XAA13020; Tue, 6 Oct 1998 23:49:33 -0600 (MDT) Message-Id: <199810070549.XAA13020@harmony.village.org> To: Peter Wemm Subject: Re: fetch -p Cc: Marc Slemko , Nate Williams , Zach Heilig , Kris Kennaway , current@FreeBSD.ORG In-reply-to: Your message of "Sat, 03 Oct 1998 01:08:39 +0800." <199810021708.BAA24001@spinner.netplex.com.au> References: <199810021708.BAA24001@spinner.netplex.com.au> Date: Tue, 06 Oct 1998 23:49:33 -0600 From: Warner Losh Sender: owner-freebsd-current@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG In message <199810021708.BAA24001@spinner.netplex.com.au> Peter Wemm writes: : It's similar to ISDN. There, a 64K B channel is 64000 bits/sec on the : wire. Data is synchronous and clock synchronized so there are no start and : stop bits, just bit patterns for start and end of packets etc. This means : that your 64K link gives you 8000 (theoretical) bytes/sec. There are : losses because the HDLC frames have address/control data, CRC's, start : markers, packet length (I think). So, in reality you get a smidge less than : 8000 bytes/sec when you are using large packets. HDLC also requires bit stuffing which can cuase slighly lower data rates too. But that is slight is very slight indeed (only needed for 6 or 7 consecutive 1 bits, iirc). Warner To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message