Power Guidelines; Power Outage; Obtaining Additional Information About Power - Cisco 7940 - IP Phone VoIP Administration Manual

Providing Power to the Cisco Unified IP Phone
These sections provide more information about powering a phone:
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Power Guidelines

Table 2-1
Table 2-1 Guidelines for Powering the Cisco Unified IP Phone 7960G and 7940G
Power Type
External power— Provided through the
CP-PWR-CUBE-3 external power supply.
PoE power—Provided by a switch through the
Ethernet cable attached to the phone.

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.

Obtaining Additional Information about Power

For related information about power, refer to the documents shown in
provide information about the following topics:
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Cisco Unified IP Phone 7960G/7940G Administration Guide for Cisco Unified Communications Manager 7.0 (SCCP)
2-4
Power Guidelines, page 2-4
Power Outage, page 2-4
Obtaining Additional Information about Power, page 2-4
provides guidelines for powering the Cisco Unified IP Phone 7960G and 7940G.
Guidelines
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Cisco switches that work with the Cisco Unified IP Phone 7960G and 7940G
The Cisco IOS releases that support bidirectional power negotiation
Other requirements and restrictions regarding power
Chapter 2 Preparing to Install the Cisco Unified IP Phone on Your Network
The Cisco Unified IP Phones use the CP-PWR-CUBE-3 power supply.
The Cisco Unified IP Phones support PoE.
The inline power patch panel WS-PWR-PANEL is compatible with the
Cisco Unified IP Phones.
To ensure uninterruptible operation of the phone, make sure that the
switch has a backup power supply.
Make sure that the CatOS or IOS version running on your switch
supports your intended phone deployment. Refer to the documentation
for your switch for operating system version information.
Table 2-2. These documents
OL-15498-01