Cisco 7970G Administration Manual page 70

Providing Power to the Phone
Table 2-2 Power Consumption and Display Brightness for Power Configurations
Phone Model Power Configuration
Cisco Unified Cisco prestandard inline power from a switch that
IP Phone supports a maximum of 7 W power per port, with
7970G bidirectional power negotiation enabled
Cisco prestandard inline power from a Cisco Switch
that supports 7 W or 15.4 W power per port, without
bidirectional power negotiation
IEEE 802.3af Class 3 power from a Cisco switch,
without bidirectional power negotiation
IEEE 802.3af Class 3 power from a third-party switch 6.3 W
IEEE 802.3af Class 3 power from a Cisco switch, with
bidirectional power negotiation enabled
Cisco prestandard inline power from a Cisco Switch
that supports 15.4 W power per port, with bidirectional
power negotiation enabled
External power using the CP-PWR-CUBE-3 power
supply
Cisco Unified IEEE 802.3af Class 3 power from a Cisco switch (with
IP Phone or without bidirectional power negotiation enabled) or
7971G-GE from a third-party switch
External power CP-PWR-CUBE-3 power supply
1. Starts at approximately 1/2 brightness, changes to full brightness when the phone negotiates additional power.
Note
Cisco Unified IP Phone Administration Guide for Cisco Unified CallManager 5.1 (SIP), Cisco Unified IP Phones
2-6
Chapter 2
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) will not allow you to set the brightness to the maximum value.
Preparing to Install the Cisco Unified IP Phone on Your Network
Max. Power Phone
Consumed Screen
from a Switch Brightness
6.3 W Approx. 1/2
6.3 W Approx. 1/2
6.3 W Approx. 1/2
Approx. 1/2
1
10.25 W Full
10.25 W Full
— Full
15.4 W Near full
— Full
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