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dwdm2
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dwdm2,
User Rank: Light Beer
12/4/2012 | 11:21:37 PM
re: Alcatel Releases Core DWDM Gear
"...when a (generally common) fiber gets cut, what happens to *all* the downstream channels??"

Can someone answer the same question for copper? How would a cut in a copper line be different than a cut in a fiber line?
PO
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PO,
User Rank: Light Beer
12/4/2012 | 11:21:36 PM
re: Alcatel Releases Core DWDM Gear
"...when a (generally common) fiber gets cut, what happens to *all* the downstream channels??"

Can someone answer the same question for copper? How would a cut in a copper line be different than a cut in a fiber line?
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Copper networks drop timeslots, or don't have amps in common. Fiber networks pass multiple wavelengths through the same amps on a common fiber.

My comment was referring to the instantaneous power spike on *other* channels at such common amps. At an extreme, let's say an amp (EDFA) is handling 128 channels: 127 from a 'thru' path, and one from a recent add/drop point. A fiber cut takes out the 127, but the one channel is unaffected.

At the amp, the input power drops by about 21dB (assuming equalized channel powers). Will the surviving channel's output power spike instantaneously (and if it does, how do we ensure it doesn't damage a receiver)? Will the amp think that all 128 channels are gone, and trip off? How does the single failure (fiber cut) not couple over to otherwise unaffected channels?

So I guess the questions are, how would this new gear eliminate failure mode coupling, and what failure mode coupling exists for copper?
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