Chapter 5 Maintaining Your AVS 3120
Using Power Protection Devices
Using Power Protection Devices
A number of devices are available that protect against power problems such as power surges, transients, and power failures. The following subsections describe some of these devices.
Surge Protectors
Surge protectors are available in a variety of types and usually provide a level of protection commensurate with the cost of the device. Surge protectors prevent voltage spikes, such as those caused during an electrical storm, from entering an AVS 3120 through the electrical outlet. Surge protectors, however, do not offer protection against brownouts, which occur when the voltage drops more than 20 percent below the normal AC line voltage level.
Line Conditioners
Line conditioners go beyond the overvoltage protection of surge protectors. Line conditioners keep an AVS 3120’s AC power source voltage at a fairly constant level and, therefore, can handle brownouts. Because of this added protection, line conditioners cost more than surge
Uninterruptible Power Supplies
Uninterruptible power supply (UPS) systems offer the most complete protection against variations in power because they use battery power to keep the AVS 3120 running when AC power is lost. The battery is charged by the AC power while it is available, so once AC power is lost, the battery can provide power to the AVS 3120 for a limited amount of
Surge protectors should be used with all UPS systems, and the UPS system should be Underwriters Laboratories (UL)
Cisco AVS 3120 Application Velocity System Hardware Installation Guide
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