From: RJ Atkinson (no email)
Date: Tue Apr 03 2001 - 19:51:41 EDT
At 18:35 03/04/01, Jesper Skriver wrote:
>Don't know how the world looks like in the US, but here a SDH/Sonet
>provider will never guarentee diversity of his/her circuit to that of a different provider,
Interesting, though they do guarantee that to NATO
circuits. smd, are you able to get diverse local paths over there ?
>often the end user can be almost sure that at least
>the last few km will be in the same duct, as the local communities
>demand that the providers cooperation when digging fiber into the
>ground...
Obviously there is a concern if everyone is in the same
duct, but if one builds with rings like sensible engineers,
then a single cut just means traffic goes the long way round.
Mind, if a backhoe disconnects one's building entirely from
the ring or there are byzantine failures, no form of multi-homing
will really save one.
At a previous job, we ensured that local transport
came down one road into the front side of the building and
a different local transport came down the back road into the
back side of the building next door, then connected the buildings
via fibre of our own. Made for quite a nice setup actually.
Ran
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