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Preventing Electrostatic Discharge Damage

Electrostatic discharge (ESD) can damage equipment and impair electrical circuitry. It

occurs when electronic printed circuit cards are improperly handled and can result in

complete or intermittent failures. Always follow ESD prevention procedures when

removing and replacing cards. Ensure that the router chassis is electrically connected to

earth ground. Wear an ESD-preventive wrist strap, ensuring that it makes good skin contact.

Connect the clip to an unpainted surface of the chassis frame to safely channel unwanted

ESD voltages to ground. To properly guard against ESD damage and shocks, the wrist strap

and cord must operate effectively. If no wrist strap is available, ground yourself by touching

the metal part of the chassis.

Caution

antistatic strap, which should be between 750 kilohm and 10 megohm.

General Site Requirements

This section describes the requirements your site must meet for safe installation and

operation of your system. Ensure that your site is properly prepared before beginning

installation.

The router can be placed on a desktop or rack-mounted in a data processing or lab

environment. The system can be mounted in either a standard or telco rack. Optional

rack-mount kits are available.

The location of individual chassis and the layout of your equipment rack or wiring room

are extremely important for proper system operation. Equipment placed too close together,

inadequate ventilation, and inaccessible panels can cause system malfunctions and

shutdowns, and can make system maintenance difﬁcult.

When planning your site layout and equipment locations, use the precautions described in

the next section, "Site Conﬁguration Precautions," to help avoid equipment failures and

reduce the possibility of environmentally caused shutdowns. If you are currently

experiencing shutdowns or unusually high errors with your existing equipment, these

precautions will help you isolate the cause of failures and prevent future problems.

2-4 Cisco 4000 Series Installation Guide

For the safety of your equipment, periodically check the resistance value of the