Date: Mon, 24 May 1999 09:41:42 -0700 (PDT) From: Tom <tom@uniserve.com> To: Dag-Erling Smorgrav <des@flood.ping.uio.no> Cc: isdn@FreeBSD.ORG, blitz@pdq.net, stable@FreeBSD.ORG Subject: Re: ISDN Terminal adapter no work Message-ID: <Pine.BSF.4.02A.9905240935480.29433-100000@shell.uniserve.ca> In-Reply-To: <xzp675imun4.fsf@localhost.ping.uio.no>
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On 24 May 1999, Dag-Erling Smorgrav wrote: > "Craig Harding" <crh@outpost.co.nz> 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
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