Date: Mon, 24 May 1999 09:48:14 -0700 From: "David Schwartz" <davids@webmaster.com> To: "Tom" <tom@uniserve.com> Cc: <isdn@FreeBSD.ORG>, <stable@FreeBSD.ORG> Subject: RE: ISDN Terminal adapter no work Message-ID: <000001bea605$374504f0$021d85d1@whenever.youwant.to> In-Reply-To: <Pine.BSF.4.02A.9905240935480.29433-100000@shell.uniserve.ca>
next in thread | previous in thread | raw e-mail | index | archive | help
Umm, 33.6 modems are synchronous. DS > 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 > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?000001bea605$374504f0$021d85d1>