Cisco Systems 7970G manual Providing Power to the Phone, Related Topics

Chapter 2 Preparing to Install the Cisco Unified IP Phone on Your Network

Providing Power to the Phone

•Data traffic present on the data/native VLAN may reduce the quality of Voice-over-IP traffic.

•Network security may indicate a need to isolate the VLAN voice traffic from the VLAN data traffic.

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/univercd/cc/td/doc/product/lan/index.htm

Related Topics

•Understanding the Phone Startup Process, page 2-9

•Network Configuration Menu, page 4-7

Providing Power to the Phone

The Cisco Unified IP Phones 7970G/7971G-GE models can be powered in with external power or with inline power. External power is provided through a separate power supply. Inline power is provided by a switch through the Ethernet cable attached to a phone.

The following sections provide more information about powering a phone:

•Power Guidelines, page 2-5

•Phone Power Consumption and Display Brightness, page 2-5

•Power Outage, page 2-7

•Obtaining Additional Information about Power, page 2-7

	Cisco Unified IP Phone Administration Guide for Cisco Unified CallManager 5.1 (SIP), Cisco Unified IP Phones
2-4	OL-11524-01