[79761] in North American Network Operators' Group
Re: Anyone familiar with the SBC product lingo?
daemon@ATHENA.MIT.EDU (Matthew Crocker)
Thu Apr 14 17:54:59 2005
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In-Reply-To: <D87C1436D1DECB4A8FEB646F4FFDCE86026FD1EE@EXCHANGE08.shastalink.k12.ca.us>
Cc: <nanog@merit.edu>
From: Matthew Crocker <matthew@crocker.com>
Date: Thu, 14 Apr 2005 17:54:32 -0400
To: "Dan Lockwood" <dlockwood@shastacoe.org>
Errors-To: owner-nanog@merit.edu
>
> SONET Circuit Service OC3-c (155Mbps) $2200 vs. Central Office Node
> Circuit Service OC3/3c (155Mbps) $675
SONET is a method of transporting TDM channels over fiber. SONET is
made up of building blocks calls a STS. A STS is equivalent to a DS-3
+ SONET Wrapper. An OC-3 equals 3 STSes. OC-3s come in two types,
'channelized' OC-3 which is 3 DS-3s in 3 STSes and Packet Over SONET
(POS), concatenated OC-3c which is 155mbps. If you are planning on
using this circuit for TDM based voice (84 T1s in 3 DS-3 chunks) then
you will want an OC-3 not an OC-3c. If you are planning on running
155mbps POS IP traffic you want an OC-3c.
OC-3 = 3 x STS-1 = 3 x DS-3 = 3 x 28 DS-1s, 84 DS-1s = 2016 DS0 voice
channels.
OC-3c = 1 x STS-3 = 155mbps
You can use an Adtran OPTI-3 to break an OC-3 into 3 distinct DS-3
channels which can be plugged into M13 muxes (Carrier Access Widebank
28) which will break a DS-3 into 28 DS-1s.
If you want IP bandwidth you can use an OC-3 POS line card from your
router vendor of choice.
-Matt
