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News and comments on community broadband networks, the communities deploying them and the technologies that support them. Published by Denise Frey and Al Bonnyman.

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Tuesday, June 24, 2003


Older singlemode fiber cable in local exchange faces threat of obsolescence, according to a new report

Older singlemode fiber cable in local exchange faces threat of obsolescence, according to a new report

"24 June 2003 Austin, TX Lightwave -- Today's embedded standard singlemode fiber cables are already obsolete for high density, long-haul applications and may also become so in the local exchange, according to a new study by Technology Futures Inc., (TFI)."

This may be a problem in local exchanges in dense urban areas but not likely in the smaller towns that are deploying municipal fiber networks. It's important to keep in mind that the older design single mode fibers can still support several 10 Gigabit/second channels using limited CWDM (coarse wavelength division multiplexing), so many of the older municipal networks still have a lot of bandwidth left in them. Also, many of these networks were designed with lots of extra "dark" (unused) fiber, at least in the case of the networks Fiber Planners designed.


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