From owner-freebsd-isp  Tue May 29 15:26:17 2001
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Date: Tue, 29 May 2001 18:42:15 -0500 (CDT)
From: Nick Rogness <nick@rogness.net>
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To: bv@wjv.com
Cc: Colin Campbell <sgcccdc@citec.qld.gov.au>,
	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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On Tue, 29 May 2001, Bill Vermillion wrote:

> 
> > 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.

	An OC-1 is an STS-1 (DS3 with sonet info) equivalent, only
	optical.  Bill is correct about not having 9,18,34..etc because
	you can carve those out of a bigger OC-3,12,48 pipe down to the
	VT1.5 (DS1) granularity (on most transport platforms).

> 
> 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.

	What will be seen in the data world is 10Gb Ethernet which is 
	equivalent to an OC-192.  10Gb Ethernet should not
	use SONET technology but plug directly into your WDM system taking
	a lambda.	

Nick Rogness <nick@rogness.net>
 - Keep on Routing in a Free World...
  "FreeBSD: The Power to Serve!"


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