Specifications

Input/Output Controller Replacement Instructions 15
Safety Guidelines
Electrostatic Discharge Prevention
Electrostatic discharge (ESD) damages equipment and impairs electrical circuitry. ESD occurs when
printed circuit boards are improperly handled and results in complete or intermittent failures.
The network processing engine, I/O controller, port adapters, and Cisco uBR7200 series cable
modem 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.
Handle the network processing engine, I/O controller, port adapters, and Cisco uBR7200 series
cable modem cards by their carrier edges and handles; never touch the printed circuit board or
connector pins.
Figure 7 shows the location of a printed circuit board in a network processing engine, I/O controller,
or Cisco uBR7200 series cable modem card metal carrier. Do not touch the printed circuit board
when handling any of the components.
Figure 7 Handling the Network Processing Engine, the I/O Controller, and the
Cisco uBR7200 Series Cable Modem Cards—Side View
Figure 8 shows the location of a printed circuit board in a port adapter metal carrier. Do not touch
the printed circuit board when handling a port adapter.
Figure 8 Handling a Port Adapter—Side View
Although the metal carrier helps to protect the printed circuit boards from ESD, wear a preventive
antistatic strap whenever handling the network processing engine, I/O controller, port adapters, or
Cisco uBR7200 series cable modem cards. 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.
Printed circuit board
Metal carrier
H6419
H6420
Metal carrier
Printed circuit board