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Cisco 7971G-GE Manual

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Cisco Unified IP Phone 7970G/7971G-GE for Cisco Unified Communications Manager 6.0
OL-12232-01
Chapter 2 Preparing to Install the Cisco Unified IP Phone on Your Network
Providing Power to the Phone
Note When a phone is powered with a method that does not support full brightness for
the phone screen, the phone Brightness control (Settings > User Preferences >
Brightness) does not allow you to set the brightness to the maximum value.
Power Outage
Your accessibility to emergency service through the phone is dependent on the
phone being powered. If there is an interruption in the power supply, Service and
Emergency Calling Service dialing will not function until power is restored. In the
case of a power failure or disruption, you may need to reset or reconfigure
equipment before using the Service or Emergency Calling Service dialing.
Obtaining Additional Information about Power
For related information about power, refer to the documents shown in Table 2-3.
These documents provide information about these topics:
• Cisco switches that work with the Cisco Unified IP Phone 7970 Series
• The Cisco IOS releases that support bidirectional power negotiation
• Other requirements and restrictions regarding power
1. Starts at approximately 1/2 brightness, changes to full brightness when the phone negotiates additional power.
Table 2-3 Related Documentation for Power
Document Topics URL
Cisco Unified IP Phone Power Injector http://www.cisco.com/en/US/products
/hw/phones/ps379/prod_installation_g
uides_list.html
PoE Solutions http://www.cisco.com/en/US/netsol/
ns340/ns394/ns147/ns412/networking
_solutions_package.html
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