The Spanish ministry of science and technology has asked
telecommunications companies to activate a backup plan in the
case of such emergencies in future.
Spare fibers in the same duct ;-?
Doesn't sound like it would be much protection from "backhoe fade"...heh
Hi blitz,
I think that you talk about multiple outage in the Telefonica
Network in Spain cause by sabotage. (48 fibers in 4 points at the same
time)
I see ok the interest of the ministry, is necessary to assure that outages
don't affect to the national infraestruture.
In our case we build our network over diverse companys with diverse path
in their fiber network. I see ok, that all companys that operate basic
services do it and they will have backup and emergency plans.
Regards,
Daniel
Intelideas
Uops ...
I don't see that this was a quote from other email 
Happy sunday
Daniel
Hi Daniel and all,
Yes, multiple fiber in multiple conduits, traveling multiple paths is the best way to insure something's going to have connectivity.
Ring topology is what I've seen mostly for best protection, if something goes down, restoration takes milliseconds and is automatic. Worst case, is some contractor digs up the place where your fiber enters your building and severs everything....not much you can do about that kind of outage.
Worst case, is
some contractor digs up the place where your fiber enters
your building and
severs everything....not much you can do about that kind of outage.
Put your fiber entrances on two opposite sides of the building. 
- James
## On 2002-06-16 15:04 -0400 blitz typed:
Hi Daniel and all,
Yes, multiple fiber in multiple conduits, traveling multiple paths is the
best way to insure something's going to have connectivity.
Ring topology is what I've seen mostly for best protection, if something
goes down, restoration takes milliseconds and is automatic.
Worst case, is
some contractor digs up the place where your fiber enters your building and
severs everything....not much you can do about that kind of outage.
Why not? -
IMHO If you already get diverse carriers splitting them between say
the front and the back of the building shouldn't be that hard
Many non colo buildings, old, or otherwise, don't have two 0 manholes,
don't have the riser infrastructure, etc. etc.
If you aren't already a carrier, you could end up spending a whole
of money on conduit leases, facilities leases, and commitments to
carriers that have to dig out from a diverse manhole, fees to the landlord
for boring the foundation and building the entrance facilities..etc.
Landlords today are very smartly getting involved in owning the core
infrastructure <splice boxes, cross connects, conduit> and leasing
it back to business, net, and carrier companies.
Regards,