From owner-freebsd-stable Mon May 24 9:41:56 1999 Delivered-To: freebsd-stable@freebsd.org Received: from pop.uniserve.com (pop.uniserve.com [204.244.156.3]) by hub.freebsd.org (Postfix) with SMTP id B9D1114E41; Mon, 24 May 1999 09:41:50 -0700 (PDT) (envelope-from tom@uniserve.com) Received: from shell.uniserve.ca [204.244.186.218] by pop.uniserve.com with smtp (Exim 1.82 #4) id 10lxnM-0000Mi-00; Mon, 24 May 1999 09:41:44 -0700 Date: Mon, 24 May 1999 09:41:42 -0700 (PDT) From: Tom X-Sender: tom@shell.uniserve.ca To: Dag-Erling Smorgrav Cc: isdn@FreeBSD.ORG, blitz@pdq.net, stable@FreeBSD.ORG Subject: Re: ISDN Terminal adapter no work In-Reply-To: Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-stable@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG On 24 May 1999, Dag-Erling Smorgrav wrote: > "Craig Harding" writes: > > Most TA's act just like very fast modems. > > "very" is perhaps not the right word, since an single ISDN channel is > less than twice as fast as a 33k6 modem. Nope. First of all, most everyone gets 2B+D ISDN (2 x 64K) anyhow, in fact 1B+D (64k) isn't available in most areas of the world. Second, ISDN is sync, but modems are async. Now some people use various async emulation protocols over ISDN (like V.120), but that is a complete waste, especially if all you are doing is PPP. Here is what is looks like: 64k ISDN channel: 64000 / 8 = 8000 bytes/sec 2 x 33.6 modem: 67200 / 10 = 6720 bytes/sec So a 64k ISDN channel is fair amount faster (about 20%) than two 33.6k modems. > DES > -- > Dag-Erling Smorgrav - des@flood.ping.uio.no Tom To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message