Chapter 2 Preparing to Install the Cisco Unified IP Phone on Your Network
Providing Power to the Phone
Table
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| Max. Power | Phone |
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| Consumed | Screen |
Phone Model | Power Configuration | from a Switch | Brightness |
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Cisco Unified | Cisco prestandard PoE from a switch that supports a | 6.3 W | Approx. 1/2 |
IP Phone | maximum of 7 W power per port, with bidirectional |
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7970G | power negotiation enabled |
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| Cisco prestandard PoE from a Cisco Switch that | 6.3 W | Approx. 1/2 |
| supports 7 W or 15.4 W power per port, without |
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| bidirectional power negotiation |
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| IEEE 802.3af Class 3 power from a Cisco switch, | 6.3 W | Approx. 1/2 |
| without bidirectional power negotiation |
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| IEEE 802.3af Class 3 power from a | 6.3 W | Approx. 1/2 |
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| IEEE 802.3af Class 3 power from a Cisco switch, with | 10.25 W | Full1 |
| bidirectional power negotiation enabled |
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| Cisco prestandard PoE from a Cisco Switch that | 10.25 W | Full |
| supports 15.4 W power per port, with bidirectional |
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| power negotiation enabled |
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| External power | — | Full |
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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 |
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from a |
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| External power | — | Full |
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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.
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| Cisco Unified IP Phone Administration Guide for Cisco Unified CallManager 5.0 (SCCP), Cisco Unified IP Phones | |
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