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Technology Stocks : SDL, Inc. [Nasdaq: SDLI] -- Ignore unavailable to you. Want to Upgrade?

To: EdR who wrote (1)	11/22/1998 1:47:00 AM
From: JW@KSC	Read Replies (4) \| Respond to of 3951

Ed - An answer in 9 words DWDM is to Fiber, what ADSL is to POTS. Here's a tutorial for your Ed.. webproforum.com JW@KSC

To: EdR who wrote (1)	11/22/1998 4:29:00 AM
From: pat mudge	Respond to of 3951

DWDM = Dense Wave Division Multiplexing, a way of transforming a single fiber into many in order to increase the bandwidth capabilities. The best list of articles is found on Cambrian System's website: cambriansys.com Click "About WDM." One article says: Much like a prism, WDM breaks down a single lightwave signal into several wavelengths, visible as colors. Current systems now can multiplex up to eight or 16 wavelengths, although several vendors have announced 32-wavelength multiplexers. WDM typically is used to get more capacity out of OC-48 (2.4 Gb/s) Sonet, the speed at which most IXCs currently operate their backbones. LECs still mostly use OC-12 (622 Mb/s), but because of traffic projections, they are under tremendous pressure to upgrade (Figure 1). . . . Cambrian Systems, which is planning to introduce a 32-channel dense WDM system called OPTera at NFOEC, sees hybridization between electrical and optical cross-connect switches. Don Smith, president of Kanata, Ontario-based Cambrian, envisions a network architecture in which ATM, IP and other protocols directly interface with the optical layer along with Sonet and plesiochronous switches. A key part of that scheme is the migration of management and protection into wavelengths within the WDM system. "All kinds of edge devices are delivering OC carriers. But Sonet does protection switching," says Smith. The goal of the Cambrian architecture is to bring that protection switching down to the OPTera, he says. "The issue is, how do you take the wavelengths and turn them into a manageable tool?" Cambrian's push is the interoffice network in the local exchange. The OPTera concept is a 80 Gb/s WDM ring of up to 20 miles without amplification. It can accommodate up to eight remotes and one hub. I've been informed there's already an SDLI thread so we may have to cancel this one. I'll keep you informed. Pat