I also wanted to pass on the website for our contract. It is was negotiated with the state so that all public organizations can take advantage. I'm sure some of you are familiar with it: https://ebiznet.sbc.com/calnetinfo/ Dill down through "Products, Services and Pricing" and then to "Rate Tables (Rider C)" Dan -----Original Message----- From: Matthew Crocker [mailto:matthew@crocker.com] Sent: Thursday, April 14, 2005 2:55 PM To: Dan Lockwood Cc: nanog@merit.edu Subject: Re: Anyone familiar with the SBC product lingo?

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