Cisco 7970G Administration Guide - Page 59

Chapter 2 Preparing to Install the Cisco Unified IP Phone on Your Network Providing Power to the Phone 1. Starts at approximately 1/2 brightness, changes to full brightness when the phone negotiates additional power. 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 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 Cisco Unified IP Phone 7970G/7971G-GE Administration Guide for Cisco Unified Communications Manager 6.1 OL-14626-01 2-7