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Cisco Unified IP Phone 7931G Administration Guide for Cisco Unified Communications Manager 8.0 (SCCP and SIP)
OL-20798-01
Chapter 2 Preparing to Install the Cisco Unified IP Phone on Your Network
Providing Power to the 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 access port of the IP phone
(native VLAN)
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 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
related documentation at this URL:
http://cisco.com/en/US/products/hw/switches/index.html
Related Topics
• Understanding the Phone Startup Process, page 2-6
• Network Configuration Menu, page 4-6
Providing Power to the Phone
The Cisco Unified IP Phones 7931G 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.
• Power Outage, page 2-3
• Power Guidelines, page 2-4
• Obtaining Additional Information about Power, page 2-4
Power Outage
Your accessibility to emergency service through the phone is dependent on the phone being powered. If
there is an interruption in the power supply, Service and Emergency Calling Service dialing will not
function until power is restored. In the case of a power failure or disruption, you may need to reset or
reconfigure equipment before using the Service or Emergency Calling Service dialing.
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