Chapter 2 Preparing to Install the Cisco Unified IP Phone on Your Network

Providing Power to the Phone

Table 2-2

Power Consumption and Display Brightness for Power Configurations

 

 

 

 

 

 

 

Max. Power

Phone

 

 

Consumed

Screen

Phone Model

Power Configuration

from a Switch

Brightness

 

 

 

 

Cisco Unified

Cisco prestandard inline power from a switch that

6.3 W

Approx. 1/2

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

6.3 W

Approx. 1/2

 

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,

6.3 W

Approx. 1/2

 

without bidirectional power negotiation

 

 

 

 

 

 

 

IEEE 802.3af Class 3 power from a third-party switch

6.3 W

Approx. 1/2

 

 

 

 

 

IEEE 802.3af Class 3 power from a Cisco switch, with

10.25 W

Full1

 

bidirectional power negotiation enabled

 

 

 

 

 

 

 

Cisco prestandard inline power from a Cisco Switch

10.25 W

Full

 

that supports 15.4 W power per port, with bidirectional

 

 

 

power negotiation enabled

 

 

 

 

 

 

 

External power using the CP-PWR-CUBE-3 power

Full

 

supply

 

 

 

 

 

 

Cisco Unified

IEEE 802.3af Class 3 power from a Cisco switch (with

15.4 W

Near full

IP Phone

or without bidirectional power negotiation enabled) or

 

 

7971G-GE

from a third-party switch

 

 

 

 

 

 

 

External power CP-PWR-CUBE-3 power supply

Full

 

 

 

 

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) will not allow you to set the brightness to the maximum value.

 

 

Cisco Unified IP Phone Administration Guide for Cisco Unified CallManager 5.1 (SIP), Cisco Unified IP Phones

 

 

2-6

 

OL-11524-01

 

 

 

Page 70
Image 70
Cisco Systems 7970G manual Brightness