D-3
Cisco 1751 Router Hardware Installation Guide
78-11258-04
Appendix D Installing the Virtual Private Network Module
Before You Begin
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.
Warning
Only trained and qualified personnel should be allowed to install or replace this
equipment.
Warning
Hazardous network voltages are present in WAN ports regardless of whether
power to the router is OFF or ON. To avoid electric shock, use caution when
working near WAN ports. When detaching cables, detach the end away from
the router first.
Preventing Electrostatic Discharge Damage
Before installing a VPN module, read the electrostatic discharge (ESD)
instructions in this section. ESD is a discharge of stored static electricity that can
damage equipment and impair electrical circuitry. It occurs when electronic
components are improperly handled and can result in complete or intermittent
failures.
Following are guidelines for preventing ESD damage:
•
Before opening the chassis, turn the router power switch to off ( O ).
•
Disconnect the power cable to the router.
•
Always use an ESD-preventive wrist or ankle strap and ensure that it makes
good skin contact.
•
Avoid contact between equipment and clothing. The wrist or ankle strap
protects the equipment only from ESD voltages on the body; ESD voltages
on clothing can still cause damage.
•
Handle printed circuit cards by the edges only; avoid touching the
components, traces, or any connector pins.