Specifications

9
Cisco 12016, Cisco 12416, and Cisco 12816 Router Clock and Scheduler, Switch Fabric, and Alarm Card Replacement Instructions
OL-13811-01
Preparing for Installation
Safety with Electricity
• Before beginning any procedures requiring access to the interior of the router, locate the emergency
power-off switch for the room in which you are working.
• Disconnect all power and external cables before installing or removing a router.
• Never assume that power has been disconnected from a circuit; always check.
• Do not perform any action that creates a potential hazard to people or makes the equipment unsafe.
• Never install equipment that appears damaged.
• Carefully examine your work area for possible hazards such as moist floors, ungrounded power
extension cables, and missing safety grounds.
• If an electrical accident does occur, proceed as follows:
– Use caution; do not become a victim yourself. Disconnect power to the router.
– If possible, send another person to get medical aid; otherwise, assess the condition of the victim
and then call for help.
– Determine if the person needs rescue breathing or external cardiac compressions; then take
appropriate action.
In addition, observe the following guidelines when working with any equipment that is disconnected
from a power source but still connected to telephone or network wiring:
• Never install telephone wiring during a lightning storm.
• 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.
Preventing Electrostatic Discharge Damage
Many router components can be damaged by static electricity. Some components can be damaged by
voltages as low as 30V, while static voltages as high as 35,000V can be generated just by handling plastic
or foam packing material, or by sliding assemblies across plastic and carpets. Not exercising the proper
electrostatic discharge (ESD) precautions can result in intermittent or complete component failures. To
minimize the potential for ESD damage, observe the following guidelines:
• Always use an ESD-preventive antistatic wrist strap or ankle strap and ensure that it makes good
skin contact.
Caution You should periodically check the resistance value of the ESD-preventive strap. The measurement
should be between 1 and 10 megohms.
• When removing or installing a component, make sure the equipment end of your antistatic strap
leash is connected to one of the ESD connection sockets on the front of the chassis or to a bare metal
surface on the chassis (see Figure 3). Avoid contact between the component and your clothing. The
ESD-preventive wrist strap only protects the component from ESD voltages on the body; ESD
voltages on your clothing can still cause component damage.