Chapter 2 Preparing to Install the Cisco Unified IP Phone on Your Network
Providing Power to the Phone
2-4
Cisco Unified IP Phone 7931G Administration Guide for Cisco Unified Communications Manager 6.1
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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 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://www.cisco.com/en/US/products/hw/switches/tsd_products_support_
category_home.html
Related Topics
• Understanding the Phone Startup Process, page 2-8
• Network Configuration Menu, page 4-7
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 2-5
• Power Guidelines, page 2-5
• Obtaining Additional Information about Power, page 2-6
