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