Cisco 7945G Administration Guide

2-4
Cisco Unified IP Phone 7965G and 7945G Administration Guide for Cisco Unified Communications Manager 6.1(3)
OL-17755-01
Chapter 2 Preparing to Install the Cisco Unified IP Phone on Your Network
Providing Power to the Phone
Power Guidelines
Table 2-1 provides guidelines that apply to external power and to PoE power for the Cisco Unified IP
Phone 7965G and 7945G.
Phone Power Consumption and Display Brightness
The power consumed by a phone depends on its power configuration. See Table 2-1 for a power
configuration overview. See Table 2-2 for the maximum power consumed by a phone for each
configuration option and the correlating phone screen brightness level.
Note Power consumption values shown in the table include power losses in the cable that connects the phone
to the switch.
Ta b l e 2-1 Guidelines for Powering the Cisco Unified IP Phone 7965G and 7945G
Power Type Guidelines
External power— Provided
through the CP-PWR-CUBE-3
external power supply
• The Cisco Unified IP Phone Series use 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.
IEEE 802.3af PoE
power—Provided by a switch
through the Ethernet cable attached
to the 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.
Ta b l e 2-2 Power Consumption and Display Brightness for Power Configurations
Phone Model Power Configuration
Max. Power
Consumed
from a Switch
Phone
Screen
Brightness
Cisco Unified IP Phone
7965G and 7945G
IEEE 802.3af Class 3 power from a Cisco switch, with
bidirectional power negotiation enabled
12 W Full
External power — Full

Cisco 7945G Specifications

General

Brand	Cisco
Model	7945G
Category	IP Phone
Language	English