Preventing Electrostatic Discharge Damage - Cisco 7000 Hardware Installation And Maintenance

Safety Recommendations
Follow these basic guidelines when working with any electrical equipment:
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In addition, use the guidelines that follow when working with any equipment that is disconnected
from a power source, but still connected to telephone wiring or other network cabling.
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Preventing Electrostatic Discharge Damage

Electrostatic discharge (ESD) damage, which occurs when electronic cards or components are
improperly handled, can result in complete or intermittent failures. The RP, SP (or SSP), and
interface processors each comprise a printed circuit board that is fixed in a metal carrier.
Electromagnetic interference (EMI) shielding, connectors, and a handle are integral components of
the carrier. Although the metal carrier helps to protect the boards from ESD, use a preventive
antistatic strap whenever handling the RP, SP (or SSP), or interface processors. Handle the carriers
by the handles and the carrier edges only; never touch the boards or connector pins.
Caution
processors. These screws prevent accidental removal, provide proper grounding for the system, and
help to ensure that the bus connectors are properly seated in the backplane.
Following are guidelines for preventing ESD damage:
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2-70 Cisco 7000 Hardware Installation and Maintenance
Before beginning any procedures requiring access to the chassis interior, locate the emergency
power-off switch for the room in which you are working.
Disconnect all power and external cables before installing or removing a chassis.
Do not work alone when potentially hazardous conditions exist.
Never assume that power has been disconnected from a circuit; always check.
Do not perform any action that creates a potential hazard to people or makes the equipment
unsafe.
Carefully examine your work area for possible hazards such as moist floors, ungrounded power
extension cables, and missing safety grounds.
Never install telephone wiring during a lightning storm.
Never install telephone jacks in wet locations unless the jack is specifically designed for wet
locations.
Never touch uninsulated telephone wires or terminals unless the telephone line has been
disconnected at the network interface.
Use caution when installing or modifying telephone lines.
Always tighten the captive installation screws on RP, SP (or SSP), and interface
Always use an ESD-preventive wrist strap or ankle strap and ensure that it makes good skin
contact.
When removing interface processors, connect the equipment end of the strap to one of the captive
installation screws on an installed interface processor or power supply. (See Figure 1-6.) When
replacing internal components that are accessible from the front of the chassis (for example, the
arbiter), connect the strap to an unpainted inner surface of the chassis, such as the inner frame
that is exposed when the panels are removed.