Preventing Electrostatic Discharge Damage - Cisco 6503 - Catalyst Firewall Security Sys Installation Manual

Site Requirements

Preventing Electrostatic Discharge Damage

Electrostatic discharge (ESD) damage, which can occur when modules or other FRUs are improperly
handled, results in intermittent or complete failures. Modules consist of printed circuit boards that are
fixed in metal carriers. Electromagnetic interference (EMI) shielding and connectors are integral
components of the carrier. Although the metal carrier helps to protect the board from ESD, always use
an ESD grounding strap when handling modules.
To prevent ESD damage, follow these guidelines:
•
•
Note
•
After you install the system ground lug, follow these steps to correctly attach the ESD wrist strap:
Attach the ESD wrist strap to bare skin as follows:
Step 1
a.
b.
Grasp the spring or alligator clip on the ESD wrist strap and momentarily touch the clip to a bare metal
Step 2
spot (unpainted surface) on the rack. We recommend that you touch the clip to an unpainted rack rail so
that any built-up static charge is then safely dissipated to the entire rack.
Step 3 Attach either the spring clip or the alligator clip to the ground lug screw as follows (See
a.
Catalyst 6500 Series Switches Installation Guide
2-20
Always use an ESD wrist strap and ensure that it makes maximum contact with bare skin. ESD
grounding straps are available with banana plugs, metal spring clips, or alligator clips. All
Catalyst 6500 series chassis are equipped with a banana plug connector (identified by the ground
symbol next to the connector) somewhere on the front panel. If you have an older Catalyst 6500
series chassis equipped with a plastic banana plug connector, we recommend that you use either the
supplied ESD grounding wrist strap (with a metal clip) or an ESD grounding wrist strap equipped
with an alligator clip. If you have a newer Catalyst 6500 series chassis that has a bare metal hole as
the banana plug connector (also identified by the ground symbol next to the connector), we
recommend that you use a personal ESD grounding strap equipped with a banana plug.
If you choose to use the disposable ESD wrist strap supplied with most FRUs or an ESD wrist strap
equipped with an alligator clip, you must attach the system ground lug to the chassis in order to
provide a proper grounding point for the ESD wrist strap.
This system ground is also referred to as the network equipment building system (NEBS)
ground.
If your chassis does not have the system ground attached, you must install the system ground. See
"Establishing the System Ground" section on page 3-52
of the chassis system ground pads.
If you are using the ESD wrist strap supplied with the FRUs, open the wrist strap package and
unwrap the ESD wrist strap. Place the black conductive loop over your wrist and tighten the strap
so that it makes good contact with your bare skin.
If you are using an ESD wrist strap equipped with an alligator clip, open the package and remove
the ESD wrist strap. Locate the end of the wrist strap that attaches to your body and secure it to your
bare skin.
If you are using the ESD wrist strap that is supplied with the FRUs, squeeze the spring clip jaws
open, position the spring clip to one side of the system ground lug screw head, and slide the spring
clip over the lug screw head so that the spring clip jaws close behind the lug screw head.
Note The spring clip jaws do not open wide enough to fit directly over the head of the lug screw
or the lug barrel.
Chapter 2 Preparing for Installation
for installation instructions and locations
Figure 2-11):
OL-5781-08