Anyone familiar with the SBC product lingo?

Thu Apr 14 21:54:32 UTC 2005

>
> 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