Table 7: Guidelines for Powering the Cisco Unified IP Phone 7975G, 7971G-GE, 7970G, 7965G, and 7945G
Guidelines
Power type
The Cisco Unified IP Phone 7975G, 7971G-GE, 7970G, 7965G, and
7945G use the CP-PWR-CUBE-3 power supply.
External power: Provided
through the CP-PWR-CUBE-3
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
The Cisco Unified IP Unified IP Phone 7975G, 7971G-GE, 7970G, 7965G,
and 7945G supports IEEE 802.3af Class 3 power on signal pairs and spare
pairs.
The Cisco Unified IP Unified IP Phone 7975G, 7971G-GE, 7970G, 7965G,
and 7945G does not support Cisco inline PoE.
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.
PoE power: Provided by a
switch through the Ethernet
cable attached to the phone
Phone Power Consumption and Display Brightness
The power consumed by a phone depends on its power configuration. The following table provides a power
configuration overview with the maximum power consumed by a phone for each configuration option and
the correlating phone screen brightness level.
Power consumption values shown in the table include power losses in the cable that connects the phone
to the switch.
Note
Cisco Unified IP Phone 7975G, 7971G-GE, 7970G, 7965G, and 7945G Administration Guide for Cisco Unified
Communications Manager 9.0 (SCCP and SIP)
32
Cisco Unified IP Phones and Telephony Networks
Phone Power Consumption and Display Brightness
