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Cisco Unified IP Phone Administration Guide for Cisco Unified CallManager 5.0 (SCCP), Cisco Unified IP Phones
OL-8148-01
Chapter 2 Preparing to Install the Cisco Unified IP Phone on Your Network
Providing Power to the Phone
• Power Outage, page 2-7
• Obtaining Additional Information about Power, page 2-7
Power Guidelines
Table 2-1 provides guidelines that apply to external power and to PoE power for
phones the Cisco Unified IP Phone 7970 Series.
Phone Power Consumption and Display Brightness
The power consumed by a phone depends on its power configuration. See
Table 2-1 for a power configuration overview. See Table 2-2 for the maximum
power consumed by a phone for each configuration option and the correlating
phone screen brightness level.
Note Power consumption values shown in the table include power losses in the cable
that connects the phone to the switch.
Table 2-1 Guidelines for Powering the Cisco Unified IP Phone 7970 Series
Power Type Guidelines
External power—
Provided through the
CP-PWR-CUBE-3
external power supply
• The Cisco Unified IP Phone 7970G and 7971G-GE use the
CP-PWR-CUBE-3 power supply.
PoE power—Provided by
a switch through the
Ethernet cable attached to
the phone
• The inline power patch panel WS-PWR-PANEL is not compatible
with the Cisco Unified IP Phone.
• 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.