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Cisco uBR-3x10 RF Switch Hardware Installation and Cabling Guide
OL-1984-06
Chapter 2 Preparing for Installation
Safety
• 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.
Warning
Do not work on the system or connect or disconnect cables during periods of lightning activity.
Statement 1001
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 Ethernet controller,
power supply, and each upstream and downstream assembly 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 these assemblies. 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 Ethernet controller, power supply, and each
upstream and downstream assembly. 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 Ethernet controllers, power supplies, and upstream and downstream assemblies that
have been removed from the Cisco uBR 3x10 RF Switch chassis, 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 Ethernet controller, power supply, and upstream or downstream assemblies 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.
• Ensure that the Ethernet assembly is fully inserted in its respective chassis slot and its captive
installation screws are tightened. The captive installation screws prevent accidental removal,
provide proper grounding for the system, and help ensure that the bus connectors are seated in the
midplane.
• Ensure that each downstream and upstream switch assembly is fully inserted in its chassis slot and
that its captive installation screws are tightened.
• Ensure that the power supply assembly is fully inserted in its chassis slot and that its captive
installation screws are tightened.
Caution For safety, periodically check the resistance value of the antistatic strap. The measurement should be
between 1 and 10 megohms (Mohms).