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Cisco 7971G-GE Manual

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Chapter 2 Preparing to Install the Cisco Unified IP Phone on Your Network
Providing Power to the Phone
2-4
Cisco Unified IP Phone 7970G/7971G-GE for Cisco Unified Communications Manager 6.0
OL-12232-01
• 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/en/US/products/hw/switches/tsd_products_support_categ
ory_home.html
Related Topics
• Understanding the Phone Startup Process, page 2-10
• Network Configuration Menu, page 4-7
Providing Power to the Phone
Models in the Cisco Unified IP Phone 7970 Series 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.
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