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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>

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	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
>
>
>
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