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To: The Barracuda™ who wrote (3485)	12/8/1999 10:55:00 PM
From: Frank A. Coluccio	Respond to of 15615

re: what is OC-3 connectivity? An OC-3 channel is an Optical Channel at level 3. Level OC-1 = ~52 Mb/s; OC-3 = ~155 Mb/s. OC-3 connectivity means that two nodes or endpoints (or combinations thereof) are connected by an optical link rated at ~155 Mb/s. OC-n's are the currency of the North American Synchronous Optical Network or SONET. An OC-3 is the SONET throughput equivalent of the European Synchronous Digital Hierarchy (SDH) STM-1 module. Each of these is rated at ~155 Mb/s. See a more complete breakdown of the SONET hierarchy, along with a brief architectural description, at: techweb.com