Cisco Systems WAVE594K9 appendix Dust and Particles, Corrosion, Electrostatic Discharge

Appendix B Maintaining the WAVE-594 and WAVE-694

Maintaining Your Site Environment

Each system is designed to operate at a maximum altitude of 3000 meters (9,843 feet) with some de-rating of maximum operating temperature (see Appendix A, “WAVE-594 and WAVE-694 Hardware Specifications”) and can be stored at a maximum altitude of 4572 meters (15,000 feet).

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. 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 gold-plated edge connectors and pin connectors on various devices in the system. This corrosion on system connectors is a gradual process that can eventually lead to intermittent failures of electrical circuits.

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 on page B-2.

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.

To reduce the effects of ESD, you should observe the following guidelines:

•Wear a grounding wrist strap. If a grounding wrist strap is unavailable, touch an unpainted metal surface on the chassis periodically to neutralize any static charge.

•Keep components in their antistatic packaging until they are installed.

•Avoid wearing clothing made of wool or synthetic materials.

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