Cisco Wide Area Application Engine 612 Hardware Installation Manual page 102

Appendix C Maintaining the Cisco Wide Area Application Engine
Using Power Protection Devices
UPS systems range in price from a few hundred dollars to several thousand
dollars, with the more expensive units allowing you to run larger systems for a
longer period of time when AC power is lost. Surge protectors should be used with
all UPS systems, and the UPS system should be Underwriters Laboratories (UL)
safety-approved.
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