Providing Power to the Phone
Providing Power to the Phone
Cisco Unified IP Phone Administration Guide for Cisco Unified CallManager 5.1 (SIP), Cisco Unified IP Phones
2-4
Chapter 2
Data traffic present on the data/native VLAN may reduce the quality of
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Voice-over-IP traffic.
Network security may indicate a need to isolate the VLAN voice traffic from
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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
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Cisco Catalyst 6000 series, for example)
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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
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Understanding the Phone Startup Process, page 2-9
Network Configuration Menu, page 4-7
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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
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Phone Power Consumption and Display Brightness, page 2-5
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Power Outage, page 2-7
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Obtaining Additional Information about Power, page 2-7
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Preparing to Install the Cisco Unified IP Phone on Your Network
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