Datasheet

Rack-Mounting and Wall-Mounting Cisco 3600 Series Routers and the Cisco Redundant Power System 5
Preventing Electrostatic Discharge Damage
— If possible, send another person to get medical aid. Otherwise, determine the condition of the
victim and then call for help.
— Determine if the victim needs rescue breathing or external cardiac compressions; then take
appropriate action.
Preventing Electrostatic Discharge Damage
Electrostatic discharge (ESD) can damage equipment and impair electrical circuitry. ESD can occur
when printed circuit cards are improperly handled and can result in complete or intermittent failures.
Always follow ESD prevention procedures when removing and replacing cards. Ensure that the
router chassis is electrically connected to earth ground. Wear an ESD-preventive wrist strap,
ensuring that it makes good skin contact. Connect the clip to an unpainted surface of the chassis
frame to safely channel unwanted ESD voltages to ground. To guard against ESD damage and
shocks, the wrist strap and cord must be used properly. If no wrist strap is available, ground yourself
by touching the metal part of the chassis.
Caution For safety, periodically check the resistance value of the antistatic strap, which should be
between 1 and 10 megohms (Mohm).
Rack-Mount Configuration Guidelines
You can mount the Cisco 3620 and Cisco 3640 routers in a 19-inch rack (with a 17.5- or 17.75-inch
opening), or a 23- or 24-inch rack.
The Cisco 3660 router can be mounted in a 19-inch rack (with a 17.5- or 17.75-inch opening) or a
23-inch rack.
The following information will help you plan your equipment rack configuration:
• Allow clearance around the rack for maintenance.
• Enclosed racks must have adequate ventilation. Make sure that the rack is not congested, because
each unit generates heat. An enclosed rack should have louvered sides and a fan to provide
cooling air. Heat generated by equipment near the bottom of the rack can be drawn upward into
the intake ports of the equipment above.
• When mounting a device in an open rack, make sure that the rack frame does not block the intake
or exhaust ports. If the device is installed on slides, check its position when it is seated into the
rack.
• Baffles can isolate exhaust air from intake air, and also help to draw cooling air through the
device. The best placement of the baffles depends on airflow patterns in the rack, which you can
find by experimenting with different configurations.
• If equipment installed in a rack (particularly an enclosed rack) fails, try operating the equipment
by itself, if possible. Power OFF other equipment in the rack (and in adjacent racks) to provide
maximum cooling air and clean power for the unit under test.