Quote:
Originally Posted by Pierre
I'd be interested to the network topology.
VM Fibre cabinets are all connected in an SDH ring so if the fibre gets cut in one place service is not interupted.
I doubt BT could mirror that with their network and would think that their cabinets will be connected by a point to point fibre, therefore if that fibre was ever cut you'd lose the whole cab and everyone on it.
Believe me cable hits are very common.
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The VM telco is resilient SDH yes, though the CATV nodes are point to point fibre.
BT will have point to point fibre backhauling the MSANs but this will not affect the telco network, the telco will be split from the VDSL and carry on to the existing exchange based voice kit, only VDSL data will be terminated and carried on that fibre.
Considering that the backhaul fibre will be travelling in the same ducts as existing telco lines its' reliability should be comparable to existing unprotected voice services over the BT network - 5 9's or better.