Specifications

Memory Replacement Instructions for the Network Processing Engine and Input/Output Controller 19
Ensuring Easy Access to the Router
Figure 11 Handling a SIMM
Although the metal carrier helps to protect the I/O controller and the network processing engine
from ESD, wear a preventive antistatic strap whenever handling the I/O controller or network
processing engine. Ensure that the strap makes good skin contact and connect the strap’s clip to an
unpainted chassis surface to safely channel unwanted ESD voltages to ground.
If no wrist strap is available, ground yourself by touching the metal part of the chassis.
Caution Make sure to tighten the captive installation screws on the network processing engine,
Cisco uBR7200 series cable modem 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, Cisco uBR7200
series cable modem 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 I/O controller,
network processing engine, Cisco uBR7200 series cable modem cards, or port adapters. Ensure
that the ESD strap makes contact with your skin.
• Handle the I/O controller, network processing engine, Cisco uBR7200 series cable modem cards,
or port adapters by their metal carrier edges and handles; avoid touching the printed circuit board
or any connector pins.
• When removing the I/O controller, network processing engine, Cisco uBR7200 series cable
modem cards, or port adapters, 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, Cisco uBR7200 series cable modem card, or port adapter to the
factory, immediately place it in a static shielding bag.
Caution Periodically check the resistance value of the antistatic strap. The measurement should be
within the range of 1 and 10 megohms.
Ensuring Easy Access to the Router
If your Cisco 7200 series router or Cisco uBR7200 series router is installed in a standard 19-inch,
4-post rack or telco rack, cables from other equipment in the rack might obstruct access to the rear
of the router. Also, rack power strips or other permanent fixtures may obstruct access to the router.
Review the following guidelines to ensure easy access to the rear of the router when it is installed in
a rack. If the router is not installed in a rack, or if you already have clear access to the rear of the
router, proceed to the “Removing and Replacing Memory DRAM SIMMs, SDRAM DIMMs, and
Boot ROMs” section on page 20.
H2326