Cisco IP Phone 6851

Access port (10/100/1000 PC)
connection (optional)
4DC adaptor port1
Handset connection5Power adapter2
Analog headset connection (optional)6Network port (10/100/1000 SW)
connection
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Cisco IP Phone 6851 Multiplatform Phones Connections
Connect your phone to your LAN with an Ethernet cable to enable full functionality of your phone. If your
Ethernet port is equipped with Power over Ethernet (PoE), you can power the phone through the LAN port.
If you don't have PoE available, then you need to use a power adapter to power the phone. Do not extend the
LAN Ethernet cable outside the building. For your phone to work, it must be connected to the IP telephony
network.
Cisco IP Phone 6800 Series Multiplatform Phones Administration Guide
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Cisco IP Phone 6851 Multiplatform Phones Connections