Cisco 7800 Series Administration Manual page 29

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Cisco IP Phone 7821
Phone Connections
Connect your Cisco IP phone to your LAN with an Ethernet cable to enable full functionality of your Cisco
IP phone. If your Ethernet port is equipped with Power over Ethernet (PoE), you can power the Cisco IP
phone through the LAN port. Do not extend the LAN Ethernet cable outside the building. For your phone to
work, it must be connected to the IP telephony network.
DC adapter port (DC48V).
AC-to-DC power supply (optional).
AC power wall plug (optional).
Cisco IP Phone 7800 Series for Third-Party Call Control Administration Guide
4 Network port (10/100 SW) connection.
IEEE 802.3af power enabled.
5 Access port (10/100 PC) connection
(optional).
6 Handset connection.
Cisco IP Phone 7821
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