Cisco 7971G User Manual

Page 4

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Chapter 3 Setting Up the Cisco Unified IP Phone

Before You Begin

3-4

Cisco Unified IP Phone Administration Guide for Cisco Unified CallManager 5.0 (SIP), Cisco Unified IP Phones

OL-8182-01

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

Inline power circuits provide current over the cable. Use the Cisco provided cable
or a minimum 24 AWG communication cable.

The following warnings apply when you use an external power supply.

Caution

Only use the proper Cisco approved external power supply. Reference the
installation manual provided with the phone.

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.

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