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Cisco IP Phone Models 7905G and 7912G Administrator Guide (SIP)
OL-4277-01
Chapter 2 Installing the Cisco IP Phone Models 7905G and 7912G
Providing Power to the Cisco IP Phone
Providing Power to the Cisco IP Phone
The Cisco IP Phone can be powered by the following sources:
• External power—optional Cisco AC adapter and power cord for connecting
to a standard wall receptacle.
• Inline power—provided to the Cisco IP Phone when connected to a
Cisco Catalyst switch that is capable of providing inline power.
Note Only the network port supports inline power from the
Cisco Catalyst switches. The network port is labelled
“10 BASET” on the Cisco IP Phone 7905G and “10/100 SW” on
the Cisco IP Phone 7912G.
• WS-PWR-PANEL—power patch panel that allows the Cisco IP Phone to be
connected to existing Catalyst 4000, 5000, and 6000 family 10/100BaseTX
switching modules.
This module sends power on pins 4, 5, 7, & 8, which are not used for Ethernet
signaling. The power patch panel attempts to verify that the attached device
is a Cisco IP Phone before providing power.
Related Topics
• Safety, page 2-2
• Connecting to the Network, page 2-4
• Installing the Cisco IP Phone Models 7905G and 7912G, page 2-6
• Power Source Design, page 2-5
• Redundancy Feature, page 2-6
• Verifying Installation, page 2-15
Power Source Design
The phone and switch automatically determine which power source the phone
uses. If the power switches to a different source, the phone user will experience
different results based on which power source is being used by the phone.