Cisco Unified 7821 User Manual page 2

Phone Connections
For your phone to work, it must be connected to the corporate IP telephony network.
1 DC adaptor port (DC48V).
2 AC-to-DC power supply (optional).
3 AC power wall plug (optional).
4 Network port (10/100 SW)
connection. IEEE 802.3af power
enabled.
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5 Access port (10/100 PC) connection.
6 Auxiliary port.
7 Handset connection.
8 Analog headset connection (optional).