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

Providing Power to the Cisco Unified IP Phone

Power Guidelines

Table 2-1
Table 2-1 Guidelines for Powering the Cisco Unified IP Phone 6921, 6941, 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

Power Outage

Your accessibility to emergency service through the phone is dependent on the phone being powered. If
there is an interruption in the power supply, Service and Emergency Calling Service dialing will not
function until power is restored. In the case of a power failure or disruption, you may need to reset or
reconfigure equipment before using the Service or Emergency Calling Service dialing.
Cisco Unified IP Phone 6921, 6941, and 6961 Administration Guide for Cisco Unified Communications Manager 8.0 (SCCP)
2-4
provides guidelines for powering the Cisco Unified IP Phone 6921, 6941, and 6961.
Guidelines
The Cisco Unified IP Phone 6921, 6941, 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, 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, and 6961.
Chapter 2 Preparing to Install the Cisco Unified IP Phone on Your Network
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