[18282] in North American Network Operators' Group
Re: T1 Circuit actual throughput 1290Kbps
daemon@ATHENA.MIT.EDU (Brett Frankenberger)
Thu Jul 9 08:42:08 1998
From: Brett Frankenberger <brettf@netcom.com>
To: dorian@blackrose.org (Dorian Kim)
Date: Thu, 9 Jul 1998 07:33:22 -0500 (CDT)
In-Reply-To: <19980709004556.F14212@blackrose.org> from "Dorian Kim" at Jul 9, 98 00:45:56 am
:: Dorian Kim writes ::
>
> While this doesn't seem to apply to Tony's case, I wouldn't make a blanket
> statements like that. If the T1 is provisioned ESF, yes you can get
> 1536 kbps, but there are places where you still can only get SF/D4 framing.
Why would SF/D4 framing reduce the available bandwidth?
In some cases, if you can't get B8ZS line coding, and have to use AMI,
you might have to drop to 24x56=1344kbps (and use one bit on each DS0
to maintin 1's density), but even then, if your routers or DSUs can
invert the data, you can still go 24x64=1536kbps. (HDLC guarantees
zero-density ... so if you invert it, you get guaranteed 1's density.)
- Brett (brettf@netcom.com)
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