Appendix B Maintaining the Wide Area Virtualization Engine
Maintaining Your Site Environment
B-6
Cisco Wide Area Virtualization Engine 274 and 474 Hardware Installation Guide
OL-17739-01
• Printers
• Telephones with real bells
• Fluorescent lights
Shock and Vibration
Excessive shock can damage the function, external appearance, and physical
structure of a system. Each system has been designed to operate properly even
after withstanding a minimum of six consecutively executed shock pulses in the
positive and negative x, y, and z axes (one pulse on each side of the system). Each
shock pulse can measure up to 5 gravities (G) for up to 11 milliseconds (ms). In
storage, the system can withstand shock pulses of 20 G for 11 ms.
Excessive vibration can cause the same problems as mentioned earlier for shock,
as well as causing components to become loose in their sockets or connectors.
Systems can be subject to significant vibration when being transported by a
vehicle or when operated in an environment with machinery that causes vibration.
Power Source Interruptions
Systems are especially sensitive to variations in voltage supplied by the AC power
source. Overvoltage, undervoltage, and transients (or spikes) can erase data from
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:
• Use one of the power protection devices described in the “Using Power
Protection Devices” section on page B-7.
• Place the system on a dedicated power circuit (rather than sharing a circuit
with other heavy electrical equipment). In general, do not allow the system to
share a circuit with any of the following:
–
Copier machines
–
Air conditioners
–
Vacuum cleaners
–
Space heaters
–
Power tools