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Cisco Unified IP Phone 7970G/7971G-GE Administration Guide for Cisco Unified Communications Manager 7.0
OL-15299-01
Chapter 2 Preparing to Install the Cisco Unified IP Phone on Your Network
Providing Power to the Phone
• Power Outage, page 2-5
• Obtaining Additional Information about Power, page 2-6
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.
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 Series uses the CP-PWR-CUBE-3 power supply.
External power—
Provided through the Cisco
Unified IP Phone Power Injector
The Cisco Unified IP Phone Power Injector may be used with any Cisco Unified IP Phone.
Functioning as a midspan device, the injector delivers inline power to the attached phone.
The Cisco Unified IP Phone Power Injector is connected between a switch port and the IP
Phone, and supports a maximum cable length of 100m between the unpowered switch and
the IP Phone.
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 7970 Series.
• 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.