Cisco 7971G-GE - IP Phone VoIP Preparing To Install - Page 4
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Providing Power to the Phone
Providing Power to the Phone
Cisco Unified IP Phone 7975G, 7971G-GE, 7970G, 7965G, and 7945G can be powered with external
power or with Power over Ethernet (PoE). External power is provided through a separate power supply.
PoE is provided by a switch through the Ethernet cable attached to a phone.
When you install a phone that is powered with external power, connect the power supply to the phone
Note
and to a power outlet before you connect the Ethernet cable to the phone. When you remove a phone that
is powered with external power, disconnect the Ethernet cable from the phone before you disconnect the
power supply.
The following sections provide more information about powering a phone:
•
•
•
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Power Guidelines
Table 2-1
7975G, 7971G-GE, 7970G, 7965G, and 7945G.
Table 2-1
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
Cisco Unified IP Phone Administration Guide for Cisco Unified Communications Manager 8.5
2-4
Power Guidelines, page 2-4
Phone Power Consumption and Display Brightness, page 2-5
Power Outage, page 2-6
Obtaining Additional Information about Power, page 2-6
provides guidelines that apply to external power and to PoE power for Cisco Unified IP Phone
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 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 Unified IP Phones 7975G, 7971G-GE, 7970G, 7965G, and
7945G support IEEE 802.3af Class 3 power on signal pairs and spare pairs.
•
The Cisco Unified IP Unified IP Phones 7975G, 7971G-GE, 7970G, 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.
Chapter 2
Preparing to Install the Cisco Unified IP Phone on Your Network
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