Paul wrote:
> Entanet's Sheffield and Nottingham pops have been out of action twice in
> the last couple of weeks.
Nottingham had a single large outage. Sheffield had two - the first of
which was the same outage as affected Nottingham. The second was
yesterday until this morning.
> On each occasion, it's been caused by someone digging up a cable (fibre)
> running beside a railway line.
Yes. The problem was a fibre cut in Global Crossing's (GX) network. It
affected multiple ISPs but Enta appear to have been particularly
affected as it seems their service from GX is deficient in that it
doesn't seem to supply diverse routing.
> Presumably this is a common and increasing problem with buried
> non-copper cable, which isn't picked up by metal detectors? (Or is it)?
GX are a major UK network operator used by many ISPs and private
networks. They run much of their fibre close alongside railway lines.
> Would it be unreasonable to expect Entanet to have standby arrangements
> capable of re-routeing traffic to by-pass damaged bits of their network?
Not unreasonable at all. It's a major failing that the network doesn't
have diverse routing built into protect against exactly this kind of thing.
Jason Clifford
--
UK Free Software Network
http://www.ukfsn.org/