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Chapter 2 Installation
Preparing for Installation
2-4
Cisco 831 Router and SOHO 91 Router Hardware Installation Guide
78-14784-02
Warning
To reduce the risk of fire, use only No. 26 AWG or larger telecommunication line
cord.
Warning
This equipment contains a ring signal generator (ringer), which is a source of
hazardous voltage. Do not touch the RJ-11 (phone) port wires (conductors), the
conductors of a cable connected to the RJ-11 port, or the associated
circuit-board when the ringer is active. The ringer is activated by an incoming
call.
Warning
During this procedure, wear grounding wrist straps to avoid ESD damage to the
card. Do not directly touch the backplane with your hand or any metal tool, or
you could shock yourself.
Preventing Electrostatic Discharge Damage
Electrostatic discharge (ESD) is a transfer of electrostatic charge between bodies
of different electrostatic potentials, such as an operator and a piece of electrical
equipment. It occurs when electronic components are improperly handled, and it
can damage equipment and impair electrical circuitry. Electrostatic discharge is
more likely to occur in the presence of synthetic fibers and dry atmosphere.
Always use the following ESD-prevention procedures when removing and
replacing components:
Step 1 Wear an ESD-preventive wrist strap that you provide, ensuring that it makes good
skin contact.
Caution To properly guard against ESD damage and shocks, the wrist strap and cord must
operate effectively. Always follow the guidelines in the preceding section,
“Warnings.”
Step 2 Do not touch any exposed contact pins or connector shells of interface ports that
do not have a cable attached.