Date: Tue, 29 May 2001 18:42:15 -0500 (CDT) From: Nick Rogness <nick@rogness.net> 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 Message-ID: <Pine.BSF.4.21.0105291823030.42930-100000@cody.jharris.com> In-Reply-To: <20010529003126.C3968@wjv.com>
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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!" To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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