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Appendix C Maintaining the Cisco Wide Area Application Engine
Using Power Protection Devices
C-8
Cisco Wide Area Application Engine 511 and 611 Hardware Installation Guide
OL-7220-02
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.