From owner-freebsd-questions  Mon May 28 21:32:11 2001
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Date: Tue, 29 May 2001 00:31:26 -0400
From: Bill Vermillion <bill@wjv.com>
To: Colin Campbell <sgcccdc@citec.qld.gov.au>
Cc: Laurence Berland <stuyman@confusion.net>,
	Christophe Prevotaux <c.prevotaux@hexanet.fr>, deepak@ai.net,
	questions@FreeBSD.ORG, isp@FreeBSD.ORG
Subject: Re: OC48 interface
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References: <3B12CBBE.567B1A8D@confusion.net> <Pine.BSF.4.33.0105291136060.90725-100000@guru.citec.qld.gov.au>
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In-Reply-To: <Pine.BSF.4.33.0105291136060.90725-100000@guru.citec.qld.gov.au>; from sgcccdc@citec.qld.gov.au on Tue, May 29, 2001 at 11:41:09AM +1000
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On Tue, May 29, 2001 at 11:41:09AM +1000, Colin Campbell thus sprach:
> Hi,
> 
> Pedant alert! According to the book in front of me (ISP Survival Guide
> (Wiley) by Geoff Huston)

> The Synchronous Digital  Hierarchy

> Level		US 		International		Mbps
> -------------------------------------------------------------
>  1		OC-1					51.84
>  2		OC-3		STM-1		       155.52
>  3              OC-9            STM-3                  466.56
>  4              OC-12           STM-4                  622.08
>  5              OC-18           STM-6                  933.12
>  6              OC-24           STM-8                 1244.16
>  8              OC-36           STM-12                1866.24
>  9              OC-48           STM-16                2488.32
> 10              OC-192          STM-64                9953.28
> 

However in the US [I don't know abou elsewhere] there is no OC-1.
No OC-9, 18, 34, or 36.

You will see OC-3, OC-12, OC-48 and OC-192.  There is doubt
that the OC-768 will have wide distribution - that about 40Gbs -
because it's part of the SONET and TDM methods, it's not going to
to see much acceptance.  

Bill
-- 
Bill Vermillion -   bv @ wjv . com

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