Cisco 6921 Administration Guide

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Cisco Unified IP Phone 6921, 6941, 6945, and 6961 Administration Guide for Cisco Unified Communications Manager 8.6 (SCCP and SIP)
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Chapter
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.
Note When you install a phone that is powered with external power, connect the power supply to the phone
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:
• Power Guidelines, page 2-4
• Power Outage, page 2-5
• Obtaining Additional Information about Power, page 2-5
Power Guidelines
Table 2-1 provides guidelines for powering the Cisco Unified IP Phone 6921, 6941, 6945, and 6961.
Table 2-1 Guidelines for Powering the Cisco Unified IP Phone 6921, 6941, 6945, and 6961
Power Type Guidelines
External power—Provided
through the CP-PWR-CUBE-3
external power supply.
The Cisco Unified IP Phone 6921, 6941, 6945, and 6961 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.
PoE power—Provided by a
switch through the Ethernet
cable attached to the 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.
External power—Provided
through inline power patch
panel WS-PWR-PANEL
The inline power patch panel WS-PWR-PANEL is compatible with the Cisco Unified
IP Phone 6921, 6941, 6945, and 6961.

Cisco 6921 Specifications

General

Brand	Cisco
Model	6921
Category	IP Phone
Language	English