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Cisco Unified IP Phones and Your Network

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 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

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

Cisco Unified IP Phone Power

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.

When you install a phone that is powered with external power, connect the power supply to the phone

Note

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

The following table provides guidelines for powering the Cisco Unified IP Phones.

Table 1: Power Guidelines for the Cisco Unified IP Phones

Power type

External power: Provided

through the CP-PWR-CUBE-3

external power supply.

VLAN)

Cisco Unified IP Phone 7941G, 7941G-GE, 7942G, 7961G, 7961G-GE, and 7962G Administration Guide for Cisco Unified

Guidelines

The Cisco Unified IP Phones 7941G, 7942G, 7961G, and 7962G use the

CP-PWR-CUBE-3 power supply

The Cisco Unified IP Phones 7941G-GE and 7961G-GE use the

CP-PWR-CUBE-3 external power supply only.

Communications Manager 9.0 (SCCP and SIP)

Cisco Unified IP Phone Power