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Cisco Unified IP Phone Administration Guide for Cisco Unified Communications Manager 8.6 (SCCP and SIP)
OL-23091-01
Chapter 2 Preparing to Install the Cisco Unified IP Phones on Your Network
Providing Power to the Cisco Unified IP Phones
• Voice traffic to and from the 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 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 Phones
The Cisco Unified IP Phones 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