Cisco Systems 8961 Providing Power to the Cisco Unified IP Phone

2-3
Cisco Unified IP Phone 8961, 9951, and 9971 Administration Guide for Cisco Unified Communications Manager 8.5 (SIP)
OL-20861-01
Chapter 2 Preparing to Install the Cisco Unified IP Phone on Your Network
Providing Power to the Cisco Unified IP Phone
• 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 Computer (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
• Ethernet Setup Menu, page 7-4
Providing Power to the Cisco Unified IP Phone
The Cisco Unified IP Phone 8961, 9951, and 9971 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
• Reducing Power Consumption on the Phone, page 2-4
• Power Negotiation over LLDP, page 2-5
• Obtaining Additional Information About Power, page 2-5