The phone utility were I live has deisel generators that kick on whenever the power goes out in order to keep the copper phone lines operational. These generators always work, or at least one of the four they have in each office does.
The phone utility were I live has deisel generators that kick on whenever the power goes out in order to keep the copper phone lines operational. These generators always work, or at least one of the four they have in each office does.
The datacenter I was in for awhile had the big gens, and with similar "phone utility" setups - they would cut to the backup gens once a month and run for longer than the UPS could hold the facility (if they detected an issue, they'd switch back to utility power).
They also had redundant gensets (2x the whole facility, 4x 'important stuff' - you could get a bit of a discount by being willing to be shut off in a huge emergency where gens were dying/running out of fuel).