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Cisco Unified IP Phone Administration Guide for Cisco Unified Communications Manager 7.1
OL-18913-01
Chapter 2 Preparing to Install the Cisco Unified IP Phone on Your Network
Providing Power to the Cisco Unified IP Phone
You can resolve these issues by isolating the voice traffic onto a separate VLAN. The switch port that
the phone is connected to would be configured to have separate VLANs for carrying:
• Voice traffic to and from the IP phone (auxiliary VLAN on the Cisco Catalyst 6000 series, for
example)
• Data traffic to and from the PC connected to the switch through the access port of the IP phone
(native VLAN)
Isolating the phones on a separate, auxiliary VLAN increases the quality of the voice traffic and allows
a large number of phones to be added to an existing network where 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
switch information at this URL:
http://cisco.com/en/US/products/hw/switches/index.html
Related Topics
• Understanding the Phone Startup Process, page 2-7
• Network Configuration Menu, page 4-5
Providing Power to the Cisco Unified IP Phone
The Cisco Unified IP Phones 7962G, 7942G, 7961G, 7961G-GE, 7941G, and 7941G-GE 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 2-4
• Obtaining Additional Information about Power, page 2-5
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