Table 2-1
Guidelines for Powering the Cisco Unified SIP Phone 3911
Power Type
Guidelines
External power—
Provided through the
CP-PWR-CUBE-3
external power supply.
The Cisco Unified SIP Phone 3911 uses the CP-PWR-CUBE-3 power
supply.
External power—
Provided through the
Cisco Unified IP Phone
Power Injector external
power supply.
The Cisco Unified IP Phone Power Injector external power supply 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.
For more information, see the
“Cisco Unified IP Phone Power Injector”
section on page 2-4
Inline power—Provided
by a switch through the
Ethernet cable attached
to the phone.
•
The Cisco Unified IP Phones support IEEE 802.3af compliant inline
power.
•
The inline power patch panel WS-PWR-PANEL is compatible with the
Cisco Unified IP Phones.
•
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
Providing Power to the Cisco Unified IP Phone
2-4
Cisco Unified SIP Phone 3911 Administration Guide for Cisco Unified Communications Manager
OL-14029-01
Cisco Unified IP Phone Power Injector
The Cisco Unified IP Phone Power Injector is an external, single-port, midspan
power injector for use with Cisco Unified IP Phones. It supports a maximum cable
length of 100m between the unpowered switch and the Cisco Unified IP Phone.
As a midspan device, it is connected between a switch port and the IP Phone, and
may reside in either the switch closet or at the desk.
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