From owner-freebsd-chat Wed Feb 16 10:51: 3 2000 Delivered-To: freebsd-chat@freebsd.org Received: from builder.freebsd.org (builder.FreeBSD.ORG [204.216.27.24]) by hub.freebsd.org (Postfix) with ESMTP id 319F837B53D for ; Wed, 16 Feb 2000 10:51:02 -0800 (PST) (envelope-from brett@lariat.org) Received: from lariat.lariat.org (lariat.lariat.org [206.100.185.2]) by builder.freebsd.org (Postfix) with ESMTP id C4B81132E3 for ; Wed, 16 Feb 2000 10:50:20 -0800 (PST) Received: from mustang (IDENT:ppp0.lariat.org@lariat.lariat.org [206.100.185.2]) by lariat.lariat.org (8.9.3/8.9.3) with ESMTP id LAA11443; Wed, 16 Feb 2000 11:50:32 -0700 (MST) Message-Id: <4.2.2.20000216114210.04307b30@localhost> X-Sender: brett@localhost X-Mailer: QUALCOMM Windows Eudora Pro Version 4.2.2 Date: Wed, 16 Feb 2000 11:50:27 -0700 To: Terry Lambert , winter@jurai.net (Matthew N. Dodd) From: Brett Glass Subject: Re: Gimme FreeBSD anyday! Cc: bright@wintelcom.net (Alfred Perlstein), brooks@one-eyed-alien.net (Brooks Davis), dscheidt@enteract.com (David Scheidt), troy@picus.com (Troy Settle), freebsd-chat@FreeBSD.ORG In-Reply-To: <200002161837.LAA15588@usr02.primenet.com> References: Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Sender: owner-freebsd-chat@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org At 11:37 AM 2/16/2000 , Terry Lambert wrote: >250ms of line silence, according to Technical Aspects of Data >Communication, McKneely, Digital Press, where in the appendices >they reproduce the Bell 103c and Bell 212 standards. The exact amount isn't part of any standard, unfortunately. My rule of thumb, when I wrote terminal emulation software, was that it should be a continuous "space" (zero) lasting approximately 10 character times at the current baud rate. It doesn't hurt any to make it too long, but if you make it too short some equipment doesn't pick it up. (It's an "out-of-band" signal, in a manner of speaking, since it's "illegal" in an asynchronous protocol to pin the line to a "space" for that long.) It's especially important to make your breaks good and long if you're using them for control purposes, e.g. a modem escape sequence. When Hayes started obnoxious enforcement of the Heatherington patent (which covered the +++ escape sequence), some modem vendors used AT as an alternative. This choice was better than TIES (a time-independent escape sequence, where +++AT caused an immediate mode change) OR the Heatherington method, so I often set up systems to use it. --Bret To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-chat" in the body of the message