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Appendix B
Maintaining the WAVE-7541, WAVE-7571, and WAVE-8541
Altitude
Operating a system at high altitude (low pressure) reduces the efficiency of forced and convection
cooling and can result in electrical problems related to arcing and corona effects. This condition can also
cause sealed components with internal pressure, such as electrolytic capacitors, to fail or perform at
reduced efficiency.
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
WAVE-8541 Hardware
(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:
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•
•
•
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 Temperature.
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:
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•
•
Specifications") and can be stored at a maximum altitude of 4572 meters
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.
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.
Cisco Wide Area Virtualization Engine 7541, 7571, and 8541 Hardware Installation Guide
Maintaining Your Site Environment
Appendix A, "WAVE-7541, WAVE-7571, and
B-3
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