Magnetism; Power Source Interruptions - Cisco 1120 Installation Manual

Appendix E Maintaining the Cisco 1120 Secure Access Control Server

Magnetism

Hard disk drives are susceptible to the effects of magnetism as they store data magnetically. Hard disk
drives should never be stored near magnetic sources such as:
•
•
•
•

Power Source Interruptions

Appliances are especially sensitive to variations in voltage supplied by the AC power source.
Overvoltage, undervoltage, and transients (or spikes) can erase data from the memory or even cause
components to fail. To protect against these types of problems, power cables should always be properly
grounded and one, or both, of the following methods should be used:
•
Besides the above equipment, the greatest threats to an appliance's power supply are surges or blackouts
caused by electrical storms.
If a blackout occurs—even a temporary one—while the appliance is turned on, turn off the appliance
immediately and disconnect it from the electrical outlet. Leaving the appliance on may cause problems
when the power is restored.
OL-19455-01
Monitors
Printers
Telephones with real bells
Fluorescent lights
Place the appliance on a dedicated power circuit (rather than sharing a circuit with other electrical
equipment). In general, do not allow the appliance to share a circuit with any of the following:
Copier machines
–
Teletype machines
–
Laser printers
–
Fax machines
–
– Any other motorized equipment
Installation Guide for the Cisco 1120 Secure Access Control Server 4.2
Maintaining Your Site Environment
E-5