Cisco 10720 - Manual (Page 4)

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Disconnect Device Warnings
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Electrostatic Discharge
Warning Before working on a system that has an on/off switch, turn OFF the power and unplug the power cord.
Warning Before working on equipment that is connected to power lines, remove jewelry (including rings,
necklaces, and watches). Metal objects will heat up when connected to power and ground and can
cause serious burns or weld the metal object to the terminals.
Disconnect Device Warnings
The Cisco 10720 Internet Router power source must be disconnected before performing any
maintenance task on the hardware modules. Please refer to the safety warnings in the “Disconnecting
Power from the Router” section of Chapter 5, “Maintaining the Cisco 10720 Internet Router”, in the
Cisco 10720 Internet Router Installation and Configuration Guide.
Electrostatic Discharge
Electrostatic discharge (ESD) can damage circuit boards and other electronic equipment if they are
handled improperly. Such mishandling can result in intermittent or complete failures of the board or
other components of the router.
When handling router components, observe the following guidelines to prevent ESD damage:
• Always use an ESD-preventive wrist strap and ensure that the strap makes adequate contact with
your skin.
• Attach an ESD-preventive wrist strap to your wrist and to the chassis; or to a bare metal surface.
(See
Figure 1 .)
• The ESD-preventive wrist strap protects equipment from ESD voltages on the body only; ESD
voltages on clothing can still cause damage to electronic components.
Caution For safety, periodically check the resistance value of the ESD-preventive wrist strap. The resistance
measurement should be between 1 and 10 megohms.
Preventing Electrostatic Discharge
Electrostatic discharge (ESD) damage can cause complete or intermittent equipment failures. Cisco
recommends using an ESD-preventive strap when you handle a router or one of its components.
Electromagnetic interference (EMI) shielding is an integral component of the router.
Following are guidelines for preventing ESD damage:
• Always use an ESD-preventive wrist or ankle strap and ensure that it makes good skin contact.
Connect the equipment end of the connection cord to bare metal on the router chassis. (See
Figure 1 .)