Cisco 7970 Series Phone Manual page 19

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.
Inline power circuits provide current through the communication cable. Use the Cisco
Caution
provided cable or a minimum 24 AWG communication cable.
Using an External Power Supply
The following warnings apply when you use the external power supply with the
Cisco Unified 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.
Warning The power supply must be placed indoors.
Only use the Cisco specified power supply with this product.
Caution
Power Outage
Your accessibility to emergency service through the phone is dependent on the phone being powered.
If there is an interruption in the power supply, Service and Emergency Calling Service dialing will not
function until power is restored. In the case of a power failure or disruption, you may need to reset or
reconfigure equipment before using the Service or Emergency Calling Service dialing.
Cisco Unified IP Phone 7970 Series for Cisco Unified CallManager 4.2(3) 11