Preventing Electrostatic Discharge Damage - Cisco UBR7225VXR Hardware Installation Manual

Safety Recommendations
The telecommunications lines must be disconnected 1) before unplugging the main power connector
Warning
and/or 2) while the housing is open. Statement 89
Before working on a chassis or working near power supplies, unplug the power cord on AC units;
Warning
disconnect the power at the circuit breaker on DC units. Statement 246
Do not work on the system or connect or disconnect cables during periods of lightning activity.
Warning
Statement 1001
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 system failures. The network processing
engine and cable interface line cards consist of 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 carrier helps protect the boards, use an antistatic strap whenever handling the
network processing engine and cable interface cards. Handle the carriers by the handles and the carrier
edges only; never touch the boards or connector pins.
Always tighten the captive installation screws on the network processing engine and cable interface line
Caution
cards. These screws prevent accidental removal, provide proper grounding for the system, and help
ensure that the bus connectors are properly seated in the midplane.
Following are guidelines for preventing ESD damage:
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Cisco uBR7225VXR Universal Broadband Router Hardware Installation Guide
2-4
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 use an ESD wrist strap or ankle strap and ensure that it makes good skin contact.
When handling a removed network processing engine or cable interface line card, make sure that the
equipment end of your ESD strap is attached to an unfinished chassis surface of the router; do not
touch the printed circuit board, and avoid contact between the printed circuit board and your
clothing. Always place the network processing engine or cable interface line card component side
up on an antistatic surface or in a static shielding bag. If you are returning the item to the factory,
immediately place it in a static shielding bag.
Chapter 2 Preparing the Cisco uBR7225VXR Router for Installation
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