Cisco 7912 User's Guide download pdf (Page 17)

Warning

Read the installation instructions before you

connect the system to its power source.

Warning

Do not work on the system or connect or

disconnect cables during periods of lightning

activity.

Warning

To avoid electric shock, do not connect safety

extra low voltage (SELV) circuits to telephone

network voltage (TNV) circuits. LAN ports contain

SELV circuits, and WAN ports contain TNV

circuits. Some LAN and WAN ports use RJ-45

connectors. Use caution when connecting cables.

The following warnings apply when you use the external power

supply with the Cisco IP Phone:

Warning

This product relies on the building's installation

for short-circuit (over current) protection. Ensure

that a fuse or circuit breaker no larger than 120

VAC, 15A U.S. (240 VAC, 10A international) is used

on the phase conductors (all current-carrying

conductors).

Warning

The device is designed to work with TN power

systems.

Warning

The plug-socket combination must be accessible

at all times because it serves as the main

disconnecting device.

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Cisco 7912 User's Guide Page 17