Phone Power Consumption And Display Brightness - Cisco 7975G Software Manual

Phone Power Consumption and Display Brightness

Table 7: Guidelines for Powering the Cisco Unified IP Phone 7975G, 7971G-GE, 7970G, 7965G, and 7945G
Power type
External power: Provided
through the CP-PWR-CUBE-3
external power supply
External power: Provided
through the Cisco Unified IP
Phone Power Injector
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
Note
to the switch.
Cisco Unified IP Phone 7975G, 7971G-GE, 7970G, 7965G, and 7945G Administration Guide for Cisco Unified
Communications Manager 9.0 (SCCP and SIP)
32
Guidelines
The Cisco Unified IP Phone 7975G, 7971G-GE, 7970G, 7965G, and
7945G use the CP-PWR-CUBE-3 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.
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.
Cisco Unified IP Phones and Telephony Networks