Cisco 1751 User Manual
Page 68
Appendix C Installing and Upgrading Memory and Packet Voice Data Modules
Safety Information
C-2
Cisco 1751 Router Hardware Installation Guide
78-11258-04
Warning
Do not work on the system or connect or disconnect cables during periods of
lightning activity.
Warning
Do not touch the power supply when the power cord is connected. For systems
with a power switch, line voltages are present within the power supply even
when the power switch is off and the power cord is connected. For systems
without a power switch, line voltages are present within the power supply
when the power cord is connected.
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.
Warning
During this procedure, wear grounding wrist straps to avoid ESD damage to the
router. Do not directly touch the backplane with your hand or any metal tool, or
you could shock yourself.