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Cisco IP Phone 7970 Administration Guide for Cisco CallManager 3.3
OL-4314-01
Chapter 3 Setting Up the Cisco IP Phone
Before You Begin
Warning
Only trained and qualified personnel should be allowed to install, replace, or
service this equipment.
Warning
Ultimate disposal of this product should be handled according to all national
laws and regulations.
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 both use RJ-45
connectors. Use caution when connecting cables.
Caution Only use the proper Cisco approved external power supply. Reference the
installation manual provided with the phone.
The following warnings apply when you use an external power supply.
Warning
This product relies on the building's installation for short-circuit (overcurrent)
protection. Ensure that a fuse or circuit breaker no larger than 120 VAC, 15 A
U.S. (240 VAC, 10 A 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.