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Author Topic: What advantages does full fibre have over copper?  (Read 8613 times)

Black Sheep

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Re: What advantages does full fibre have over copper?
« Reply #30 on: August 30, 2016, 08:30:56 PM »

It is however much easier to detect a tap on fibre, as the light level usually suffers a significant loss. If appropriate hardware is used, then it is easily detected. Not only that, but quantum technology is being used as well nowadays, essentially emitting a photon with a quantum state, which when intercepted changes state, and can then be detected at the other end.

I have no idea whatsoever of the percentage-chance ....... but 'Tapping' or putting a 'Bridged Tap' on a copper pair of wires would probably be as noticeable as light-loss on a fibre ?? At least for that one EU ?? 
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niemand

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Re: What advantages does full fibre have over copper?
« Reply #31 on: August 31, 2016, 12:04:48 AM »

It is however much easier to detect a tap on fibre, as the light level usually suffers a significant loss. If appropriate hardware is used, then it is easily detected. Not only that, but quantum technology is being used as well nowadays, essentially emitting a photon with a quantum state, which when intercepted changes state, and can then be detected at the other end.

Taps in either optics or electrical transmission can be detected from the microreflections or drop in received signal power or increase in required transmission power, however I seriously doubt that anyone is going to tap an xDSL line, separating it from a cable bundle and going to that level of work, and demodulate it when they can tap an optical backhaul.

Quantum transmission. Really? Quantum cryptography is certainly a thing, but it's a very long way from commodity. Haven't seen quantum kit in the Cisco or Juniper catalogues.
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Weaver

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Re: What advantages does full fibre have over copper?
« Reply #32 on: August 31, 2016, 12:29:09 AM »

Agreed. Quantum teleportation (of photons) I believe exists in the research labs, eg at York University, but as I understand is still along way from being useable at the moment.

Side note: The Aspect experiment (c. 1980, test of the Einstein-Podolsky-Rosen effect) did demonstrate something vaguely related which seemed (naively) to contradict special relativity but doesn't allow practical comms. But later work is heading in the comms direction iirc. I used to know all this stuff once.
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NEXUS2345

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Re: What advantages does full fibre have over copper?
« Reply #33 on: August 31, 2016, 12:47:01 AM »

Not quantum teleportation, it is as Ignitionnet said, quantum cryptography, and the kit is definitely being worked on
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