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To: Raymond Duray who wrote (881)	1/6/2000 11:25:00 PM
From: Curtis E. Bemis	Read Replies (1) \| Respond to of 1782

Hi Ray-- Glad you found that exchange interesting. As for the "c" in OC-3c, OC-12c, OC-48c, OC-192c, that stands for concatenated. A concatenated payload structure allows for the elimination of unnecessary overhead Bytes in the SONET/SDH frame when there are no sub-rate TDM multiplexed structures in the frame. In this case, the "c" case, the entire frame payload is then used for data in a direct fashion. You might find a recent book published by the IEEE Press of interest. It is a semi-technical overview of DWDM. "Introduction to DWDM Technology-Data in a Rainbow", by S. V. Kartalopoulos, IEEE ISBN-0-7803-5399-4. IEEE Order Number PC5831. See ieee.org