Specifications

ManualsBrandsCisco ManualsComputer equipment7911G - IP Phone VoIP

2-3

Cisco Unified IP Phone 7906G and 7911G for Cisco Unified Communications Manager 8.0

OL-21033-01

Chapter 2 Preparing to Install the Cisco Unified IP Phone on Your Network

Providing Power to the Cisco Unified IP Phone 7906G and 7911G

Isolating the phones on a separate, auxiliary VLAN improves the quality of the voice traffic and allows

a large number of phones to be added to an existing network in which there are not enough IP addresses

for each phone.

For more information, refer to the documentation included with a Cisco switch. You can also access

Related Topics

• Understanding the Phone Startup Process, page 2-5

• Network Configuration Menu, page 4-5

Providing Power to the Cisco Unified IP Phone 7906G and 7911G

The Cisco Unified IP Phone 7906G and 7911G 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.

These sections provide more information about powering a phone:

• Power Guidelines, page 2-3

• Power Outage, page 2-4

• Obtaining Additional Information about Power, page 2-4

Power Guidelines

Table 2-1 provides guidelines that apply to external power and to PoE power for the Cisco Unified IP

Phone 7906G and 7911G.

Table 2-1 Guidelines for Powering the Cisco Unified IP Phone 7906G and 7911G

Power Type Guidelines

External power—

Provided through a Cisco

external power supply.

The Cisco Unified IP Phone Series 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 phone.

PoE power—Provided by

a switch through the

Ethernet cable attached to

the phone.

• The Cisco Unified IP Phone 7906G and 7911G support both Cisco inline power and IEEE

802.3af Power over Ethernet.

• 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.