Cisco Unified IP Phone Power

Cisco Unified IP Phone Power

Cisco Unified IP Phone Power

The Cisco Unified IP Phones can be powered with external power or with Power over Ethernet (PoE). External power is provided through a separate power supply. PoE is provided by a switch through the Ethernet cable attached to a phone.

 

Note When you install a phone that is powered with external power, connect the power supply to the phone and to a power outlet before you connect the Ethernet cable to the phone. When you remove a phone that is powered with external power, disconnect the Ethernet cable from the phone before you disconnect the power supply.  

 

The following sections provide more information about powering a phone.

 

Power Guidelines

The following table provides guidelines for powering the Cisco Unified IP Phones.

 


Power type


Guidelines


External power: Provided through the CP-PWR-CUBE-3 external power supply.


The Cisco Unified IP Phones 7941G, 7942G, 7961G, and 7962G use the CP-PWR-CUBE-3 power supply

 

The Cisco Unified IP Phones 7941G-GE and 7961G-GE use the CP-PWR-CUBE-3 external power supply only.


External power—Provided through the Cisco Unified IP Phone Power Injector.

 
The Cisco Unified IP Phone Power Injector may be used with any Cisco Unified IP Phone. Functioning as a midspan device, the injector delivers inline power to the attached phone. The Cisco Unified IP Phone Power Injector is connected between a switch port and the IP Phone, and supports a maximum cable length of 100 m between the unpowered switch and the IP Phone.
               


PoE power—Provided by a switch through the Ethernet cable attached to the phone.


The Cisco Unified IP Phones 7962G, 7942G, 7961G, and 7941G support Cisco inline PoE, but the Cisco Unified IP Phones 7961G-GE, and 7941G-GE do not.

 

The Cisco Unified IP Phones 7962G and 7942G support IEEE 802.3af Class 2 power on signal pairs and spare pairs. The Cisco Unified IP Phones 7961G-GE, and 7941G-GE are not compatible with Cisco switches that are not IEEE compliant.

 

To ensure uninterruptible operation of the phone, make sure that the switch has a backup power supply.

 

Make sure that the CatOS or IOS version running on your switch supports your intended phone deployment. Refer to the documentation for your switch for operating system version information.

 

Power Outage

Your access to emergency service through the phone requires the phone to receive power. If an interruption in the power supply occurs, Service and Emergency Calling Service dialing do not function until power is restored. In the case of a power failure or disruption, you may need to reset or reconfigure equipment before you can use the Service or Emergency Calling Service dialing.

 

Additional Information About Power

For related information about power, refer to the documents shown in the following table. These documents provide information about the following topics:

  • Cisco switches that work with the Cisco Unified IP Phones
  • The Cisco IOS releases that support bidirectional power negotiation
  • Other requirements and restrictions regarding power 

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