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Technology Stocks : Voice-on-the-net (VON), VoIP, Internet (IP) Telephony -- Ignore unavailable to you. Want to Upgrade?

To: Barbara Barry who wrote (1863)	11/7/1998 6:27:00 PM
From: Frank A. Coluccio	Read Replies (1) \| Respond to of 3178

>> WDM???something-digital multiplexing???Can you elaborate on some of th...<< Yes, WDM = Wavelength Division Multiplexing. This is currently one of the means (the most popular one) by which multiple optical channels are created within a single strand of fiber. Typical channel counts are 4, 8, 16, 40, 80, 96, and counting, depending on the model and its intended use. Each of the channels in a 40 channel system, say, can carry today in excess of 10 Gbits/sec, the limitation at this time being that of the electronics at the source, for the most part. Typcially, however, each of the 40 channels would carry in the area of 2.5 Gigabits/sec. Makers of WD Muxes include Ciena, Perelli, Cambrian, Nortel, Lucent, Alcatel, etc. Harmonic Lightwaves and Ozicom also supply WDM, but I'm not sure if they manufacture it or OEM it, or maybe both... Maybe someone else can answer these questions for us. When multiple channels are grouped closely together in the same region of the optical spectrum within a single strand, this is said to be [gulp...!] Dense Wavelength Division Multiplexing, or DWDM. {Hi, Curtis!} Hope this helps, Frank Coluccio