Chapter 5 Maintaining the Cisco Global Site Selector 4490
Maintaining Your Site Environment
Dust and Particles
A clean operating environment can greatly reduce the negative effects of dust and other particles, which act as insulators and interfere with the operation of a system’s mechanical components. Also, in addition to regular cleaning, you should follow these guidelines to deter contamination of the system equipment:
•Do not permit smoking anywhere near the system.
•Do not permit food or drink near the system.
•Use dust covers when the system is not in use.
•Close windows and outside doors to keep out airborne particles.
Corrosion
The oil from a person’s fingers or prolonged exposure to high temperature or humidity can corrode the
To prevent corrosion, you should avoid touching contacts on boards and cards. Protecting the system from corrosive elements is especially important in moist and salty environments, which tend to promote corrosion. Also, as a further deterrent to corrosion, the system should not be used in extreme temperatures, as explained in the “Temperature” section.
Electrostatic Discharge
Electrostatic discharge (ESD) results from the buildup of static electricity on the human body and certain other objects. This static electricity is often produced by simple movements such as walking across a carpet. ESD is a discharge of a static electrical charge that occurs when a person whose body contains such a charge touches a component in the system. This static discharge can cause components, especially chips, to fail. ESD is a problem particularly in dry environments where the relative humidity is below 50 percent.
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