OT - Fibre in Water Project

[The Natural Philosopher]

Not if you dont have one. And water is safer than gas

[The Natural Philosopher]

None, because fibre doesn't need repeaters.

20km to your nearest area code exchange

[The Natural Philosopher]

BT FTTP do up to 20km including splitters without amplification

Monomode fibre itself can do a lot more

[Mark Carver]

Although unleashed it can be just as destructive

[The Natural Philosopher]

Not in an under street main.

[Andy Burns]

GPON does use singlemode fibre.

[mechanic]

Yes, repeaters are fast becoming a problem for submarine systems not for land based systems.

[newshound]

Well there was a fairly dramatic failure in Hackney a few years back; but even so your general point stands.

[The Natural Philosopher]

That's why 'itself' is in the sentence.

Bt doesn't push it to its limit. Obviously for e.g., undersea cables one wants minimum repeater count, so they use bigger lasers and more sensitive and expensive receivers. BT is using cheaper stuff with passive splitters that in themselves are lossy. Your home modem has a low power laser for cost reasons

They have dome their sums I am sure and arrived at the optimal topology for their network, and their limit of guaranteed performance is 20km. As was pointed out in an earlier thread, they puts the kibosh on most local exchanges - the fibre will go unamplified and passively split to a few larger ones, and whether one should call them 'exchanges' is moot..

[The Natural Philosopher]

a gas explosion can take out a while building. unusual for a water main to do that

[Andrew]

And water bills shoot up as water companies want a slice of the action.

[SH]

Dial up water speed anyone? :-))

[bert]

How would this fibre pass through valves?

[Steve Walker]

Presumably using water-tight glands to let the fibres exit the pipe before the valve and re-enter after.

[newshound]

I'm sure they will bypass the large main isolation valves, with throttling arrangements so that the "water bypass" will not be significant. The "isolation valves" themselves will often leak, of course. I somehow doubt that "your" bit of fibre will come down your personal pipe from the water board stop tap in the street.