Cisco 7246 - uBR Router, Руководство по установке оборудования

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Cisco uBR7200 Series Universal Broadband Router Hardware Installation Guide
OL-5421-03
Chapter 2 Preparing the Cisco uBR7200 Series Router for Installation
Safety Recommendations
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:
Warning
The telecommunications lines must be disconnected 1) before unplugging the main power connector
and/or 2) while the housing is open.
Statement 89
Warning
Before working on a chassis or working near power supplies, unplug the power cord on AC units;
disconnect the power at the circuit breaker on DC units.
Statement 246
Warning
Do not work on the system or connect or disconnect cables during periods of lightning activity.
Statement 1001
• 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.
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, I/O controller, each cable interface card, each port adapter, and the cable clock card consists 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, I/O controller,
cable interface cards, port adapters, and the cable clock card. Handle the carriers by the handles and the
carrier edges only; never touch the boards or connector pins.
Caution
Always tighten the captive installation screws on the network processing engine, I/O controller,
cable interface cards, and the cable clock card. 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:
• Always use an ESD wrist strap or ankle strap and ensure that it makes good skin contact.
•
When handling a removed network processing engine, I/O controller, cable interface line card, port
adapter, or cable clock 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,
I/O controller, cable interface card, port adapter, or cable clock 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.