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Chapter 2
Preparing Your Site for Installation
Preventing Electrostatic Discharge Damage
Electrostatic discharge (ESD) damage, occurs when electronic cards or components are improperly
handled and can result in complete or intermittent failures. The Supervisors, and all line cards consist of
a printed circuit card that is fixed in a metal carrier. Electromagnetic interference (EMI) shielding and
connectors are integral components of the carrier. Although the metal carrier helps to protect the cards
from ESD, use an antistatic strap each time you handle the modules. Handle the carriers by the edges
only; never touch the cards or connector pins.
Caution
Always tighten the captive installation screws on all system components when you are installing them.
These screws prevent accidental removal of the module, provide proper grounding for the system, and
help to ensure that the bus connectors are properly seated in the backplane. Captive screws should be
torqued to 6-8 in-lbs to ensure proper grounding and mechanical support. Never use cordless or corded
drills to tighten screws, power screwdrivers and hand tools are acceptable.
Static electricity can harm delicate components inside your system. To prevent static damage, discharge
static electricity from your body before you touch any of your system components, such as an
microprocessor. As you continue to work on your system, periodically touch an unpainted metal surface
on the computer chassis.
Following are guidelines for preventing ESD damage:
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Caution
For safety, periodically check the resistance value of the antistatic strap. The measurement should be
between 1 and 10 megohms.
Electrical Safety
All system components are hot-swappable. They are designed to be removed and replaced while the
system is operating without presenting an electrical hazard or damage to the system.
OL-16264-04
Always use an ESD-preventive wrist or ankle strap and ensure that it makes good skin contact.
Before removing a card from the chassis, connect the equipment end of the strap to the ESD plug at
the bottom of the chassis below the power entry modules (see
Handle line cards by the faceplates and carrier edges only; avoid touching the card components or
any connector pins.
When removing a card, place the removed module component-side-up on an antistatic surface or in
a static-shielding bag. If the module will be returned to the factory, immediately place it in a
static-shielding bag.
Avoid contact between the modules and clothing. The wrist-strap protects the card from ESD
voltages on the body only; ESD voltages on clothing can still cause damage.
When transporting a sensitive component, first place it an antistatic container or packaging.
Handle all sensitive components in a static-safe area. If possible, use antistatic floor pads and
workbench pads.
Preventing Electrostatic Discharge Damage
Figure
Cisco RF Gateway 10 Hardware Installation Guide
3-13, and
Figure
3-14).
2-15
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