Re: We had this...
We had a car take out a green junction box, still wonder about the speed needed to jump a 10 inch curb, any way it took out 4 ADSL lines and some T1's. We were down for over a day.
Anyway we had a new fibre cable run in from the other end of the road and on our first real weekend DR test found out the backup batteries needed to be replaced, but the big and do mean big generators worked every time.
The second weekend test failed as starter motor system was run off the batteries and someone left unplugged when news ones got swapped in; the second "second" test worked after a few hours, and double checked a few more times.
The third weekend test failed as no one filled up the diesel for the donkey starter motors.
The off site DR test is another story.