Speaking on Deep Background, the Press Secretary whispered:
Level 4 datacenters can, and will, fail. Nothing you can
do including just doing 48V DC for everything are truly
Hard to find anyone who takes the -48vdc mantra to heart more
than an RBOC. Ditto on lightning protection.
Yet I recall the Bell South 305-255 CO taking a lightning hit on
the incoming power; the 5ESS was down for 3-4 hours.