Phone Power Consumption And Display Brightness - Cisco 7970G - IP Phone VoIP Administration Manual

Providing Power to the Phone

Phone Power Consumption and Display Brightness

Note
Table 2-2 Power Consumption and Display Brightness for Power Configurations
Phone Model Power Configuration
Cisco Unified Cisco prestandard PoE from a switch that supports a
IP Phone maximum of 7 W power per port, with bidirectional
7970G power negotiation enabled
Cisco prestandard PoE 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 PoE from a Cisco Switch that
supports 15.4 W power per port, with bidirectional
power negotiation enabled
External power
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
Cisco Unified IP Phone 7970G/7971G-GE Administration Guide for Cisco Unified Communications Manager 6.1
2-6
Chapter 2
The power consumed by a phone depends on its power configuration. See
Table 2-1 for a power configuration overview. See
power consumed by a phone for each configuration option and the correlating
phone screen brightness level.
Power consumption values shown in the table include power losses in the cable
that connects the phone to the switch.
Preparing to Install the Cisco Unified IP Phone on Your Network
Table 2-2 for the maximum
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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