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Cisco 7841 Installationshandbuch
Technical Details

Phone Power Requirements

You can power the Cisco IP Phone with external power or with Power over Ethernet (PoE). A separate power supply
provides external power. The switch can provide PoE through the phone Ethernet cable. For more information on your
phone's power requirements, consult your phone's data sheet.
When you install a phone that is powered with external power, connect the power supply 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.
Table 1: Guidelines for Cisco IP Phone 6800 Series Power
Power Type
External power: Provided through the
external power supply
External power—Provided through the
Cisco IP Phone Power Injector connected to
the 6841 and 6861 phones.
PoE power—Provided by a switch through
the Ethernet cable attached to the 6821,
6851, and 6871 phones.
Table 2: Guidelines for Cisco IP Phone 7800 Series Power
Power Type
External power: Provided through the CP-
PWR-CUBE-3= external power supply
External power—Provided through the
Cisco IP Phone Power Injector
PoE power—Provided by a switch through
the Ethernet cable attached to the phone.
Installation Guide for Cisco IP Phone with Multiplatform Firmware
32
Guidelines
The 6800 series phones use a custom power supply.
The Cisco IP Phone Power Injector may be used with the phones.
Functioning as a midspan device, the injector delivers inline power
to the attached phone. The Cisco IP Phone Power Injector connects
between a switch port and the phone, and supports a maximum
cable length of 100 m between the unpowered switch and the phone.
To ensure uninterruptible operation of the phone, make sure that the
switch has a backup power supply.
Make sure that the Cat OS or IOS version that runs on your switch
supports your intended phone deployment. See the documentation
for your switch for operating system version information.
Guidelines
The Cisco IP Phone uses the CP-PWR-CUBE-3 power supply.
The Cisco IP Phone Power Injector may be used with most Cisco
IP Phones. The phone datasheet identifies if the phone can use the
power injector.
Functioning as a midspan device, the injector delivers inline power
to the attached phone. The Cisco IP Phone Power Injector connects
between a switch port and the phone, and supports a maximum cable
length of 100m between the unpowered switch and the phone.
To ensure uninterruptible operation of the phone, make sure that the
switch has a backup power supply. Make sure that the Cat OS or
IOS version that runs on your switch supports your intended phone
deployment. See the documentation for your switch for operating
system version information.
Phone Power Requirements