Power Guidelines
The following table provides guidelines for Cisco Unified IP Phone 8961, 9951, and 9971 power.
Table 7: Guidelines for Cisco Unified IP Phone 8961, 9951, and 9971 Power
Guidelines
Power type
The Cisco Unified IP Phone 8961, 9951, and 9971 uses the CP-PWR-CUBE-4
power supply.
You must use the CP-PWR-CUBE-4 when you deploy the Cisco
Unified IP Phone 9971 on a wireless network.
Note
External power: Provided
through the
CP-PWR-CUBE-4=
external power supply
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 connects
between a switch port and the IP Phone, and supports a maximum cable length
of 100m between the unpowered switch and the IP phone.
External power
—
Provided
through the Cisco Unified
IP Phone Power Injector.
Cisco Unified IP Phone 8961, 9951, and 9971 supports IEEE 802.3af Class 3
power on signal pairs and spare pairs.
Cisco Unified IP Phone 8961, 9951, and 9971 supports IEEE 802.3at for
external add-on devices.
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 that runs on your switch supports
your intended phone deployment. See the documentation for your switch for
operating system version information.
Support for NG-PoE+: The Cisco Unified IP Phone 8961, 9951, and 9971 can
draw more power than IEEE 802.3at, as long as there is NG-PoE+ switch
support.
PoE power
—
Provided by a
switch through the Ethernet
cable attached to the phone.
Power Outage
Your access to emergency service through the phone requires the phone to receive power. If an interruption
in the power supply occurs, Service and Emergency Calling Service dialing do not function until power is
restored. In the case of a power failure or disruption, you may need to reset or reconfigure equipment before
you can use the Service or Emergency Calling Service dialing.
Phone Power Reduction
You can reduce the amount of energy that the Cisco Unified IP Phone consumes by using Power Save or
EnergyWise (Power Save Plus) mode.
Cisco Unified IP Phone 8961, 9951, and 9971 Administration Guide for Cisco Unified Communications Manager
10.0 (SIP)
44
Cisco Unified IP Phone and telephony networks
Power Guidelines
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