Phone Power Consumption And Display Brightness; Providing Power To The Phone - Cisco 7965G Administration Manual

Providing Power to the Phone

Power Guidelines
Table 2-1
Phone 7965G and 7945G.
Table 2-1 Guidelines for Powering the Cisco Unified IP Phone 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
IEEE 802.3af 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. See
configuration overview. See
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.
Table 2-2 Power Consumption and Display Brightness for Power Configurations
Phone Model Power Configuration
Cisco Unified IEEE 802.3af Class 3 power from a Cisco switch, with
IP Phone bidirectional power negotiation enabled
7965G and
External power
7945G
Cisco Unified IP Phone 7965G and 7945G Administration Guide for Cisco Unified Communications Manager 6.0
2-4
provides guidelines that apply to external power and to PoE power for the Cisco Unified IP
Guidelines
The Cisco Unified IP Phone Series 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 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.
The Cisco Unified IP Phone 7965G and 7945G support IEEE 802.3af
•
Class 3 power on signal pairs and spare pairs.
The Cisco Unified IP Phone 7965G and 7945G do 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 running on your switch
•
supports your intended phone deployment. Refer to the documentation
for your switch for operating system version information.
Table 2-2
Chapter 2 Preparing to Install the Cisco Unified IP Phone on Your Network
for the maximum power consumed by a phone for each
Max. Power
Consumed
from a Switch
12 W
—
Table 2-1 for a power
Phone
Screen
Brightness
Full
Full
OL-12650-01