Providing Power To The Cisco Unified Ip Phone; Power Guidelines - Cisco 6921 Administration Manual

Providing Power to the Cisco Unified IP Phone

Providing Power to the Cisco Unified IP Phone
The Cisco Unified IP Phone 6921, 6941, 6945, and 6961 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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•
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Power Guidelines

Table 2-1
Table 2-1 Guidelines for Powering the Cisco Unified IP Phone 6921, 6941, 6945, and 6961
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.
External power—Provided
through inline power patch
panel WS-PWR-PANEL
Cisco Unified IP Phone 6921, 6941, 6945, and 6961 Administration Guide for Cisco Unified Communications Manager 8.6 (SCCP and SIP)
2-4
Power Guidelines, page 2-4
Power Outage, page 2-5
Obtaining Additional Information about Power, page 2-5
provides guidelines for powering the Cisco Unified IP Phone 6921, 6941, 6945, and 6961.
Guidelines
The Cisco Unified IP Phone 6921, 6941, 6945, and 6961 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 6921, 6941, 6945, and 6961 support IEEE 802.3af Class
•
2 power on signal pairs and spare pairs.
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.
The inline power patch panel WS-PWR-PANEL is compatible with the Cisco Unified
IP Phone 6921, 6941, 6945, and 6961.
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