jimbob79: Just chucking in my two cents. I have a smallish APC UPS to power my Linksys ATA, TelstraClear Motorola Cable Gateway, Linksys Wireless Access Point and my Cordless DECT phone base station.
In theory during a power cut I should still have phone & internet access during the outage. However last year there was a power-cut in Lower Hutt for about 2 hours which also knocked out the TelstraClear's own exchange and my cable internet connection was lost.
So even through I took every precaution to maintain interruptible power supply to my own devices it was still not perfect. Also the another thing was the annoying beeping sound generated by my UPS alerting me there was no mains power. I could not turn off the beeping sound for the two hours the power was out.
Additionally because the power knocked out the TelstraClear exchange, once the power did come back on-line it took about 30-50mins for the Cable Modem the reconnect and authorise/sync or wherever the hell is does when it's lost connection.
I did phone TelstraClear and they did say that UPS are supplied to there exchanges/cabinets and the power outage should not effected there own equipment.
The UPS I've got is a APC Power-Saving Back-UPS ES 8 Outlet 700VA
I not sure if it' still available but I managed to pick one up for a special promotional price of only $70+GST