Cisco NPE-175 Installation And Configuration Manual page 170

Software and Hardware Requirements
Figure 8-3
1 Metal carrier
Although the metal carrier helps to protect the printed circuit boards from ESD, wear a preventive
antistatic strap whenever handling the network processing engine or network services engine, I/O
controller, port adapters, or Cisco uBR7200 series cable interface line cards. Ensure that the strap makes
good skin contact and connect the strap's clip to an unpainted chassis surface to channel unwanted ESD
voltages safely to ground.
If no wrist strap is available, ground yourself by touching the metal part of the chassis.
Make sure to tighten the captive installation screws on the network processing engine or network
Caution
services engine, Cisco uBR7200 series cable interface line cards, and the I/O controller (use a number 2
Phillips or a 3/16-inch flat-blade screwdriver). These screws prevent accidental removal, provide proper
grounding for the router, and help to ensure that the network processing engine or network services
engine, Cisco uBR7200 series cable interface line cards, and the I/O controller are properly seated in the
router midplane.
Following are guidelines for preventing ESD damage:
Always use an ESD wrist strap or ankle strap when installing or replacing the network processing
•
engine or network services engine, I/O controller, port adapters, or Cisco uBR7200 series cable
interface line cards. Ensure that the ESD strap makes contact with your skin.
Handle the network processing engine or network services engine, I/O controller, port adapters, or
•
Cisco uBR7200 series cable interface line cards by their metal carrier edges and handles only; avoid
touching the printed circuit board components or any connector pins.
When removing the network processing engine or network services engine, I/O controller, port
•
adapters, or Cisco uBR7200 series cable interface line cards, place them on an antistatic surface
with the printed circuit board components facing upward, or in a static shielding bag. If you are
returning an I/O controller, network processing engine or network services engine, port adapter, or
Cisco uBR7200 series cable interface line card to the factory, immediately place it in a static
shielding bag.
Periodically check the resistance value of the antistatic strap. The measurement should be within the
Caution
range of 1 to 10 megohms (Mohms).
Network Processing Engine and Network Services Engine Installation and Configuration
8-16
Handling a Port Adapter—Side View
1
2
Chapter 8
2 Printed circuit board
Preparation for Installation
OL-4448-12