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Technology Stocks : Ciena (CIEN)

CIEN 230.45

+9.4%

Dec 19 4:00 PM EST

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To: Gary Korn who wrote (1290)	2/20/1998 2:57:00 PM
From: Maverick	Read Replies (2) of 12623

WDM: NA, part XII "Open" WDM Systems Commercial WDM systems exist today in three basic point-to-point configurations: With the wavelength-specific transmitters (and receivers) included in the SONET systems (or other network elements) With the wavelength-specific transmitters incorporated into a transponder (that receives signals from the SONET or other systems), but with the receivers at SONET systems With both wavelength-specific transmitters and receivers incorporated into transponder banks The transmitter configuration described in Fig. 2 is of the latter, "open system" configuration. As described in the text, SONET and ATM systems feed the transponder terminals and, at the far end, a receiver bank separately detects each wavelength's signal and a short-haul laser is used to retransmit the signal to the final receiving network elements. The objective of this approach is to enable the optical layer to support transmission of signals from dissimilar network elements, including systems that are not typically configured for long distance telecommunications.

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