Cisco 7821 Administration Guide

Network port (10/100 SW) connection.
IEEE 802.3af power enabled.
4DC adapter port (DC48V).1
Access port (10/100 PC) connection
(optional).
5AC-to-DC power supply (optional).2
Handset connection.6AC power wall plug (optional).3
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.
Cisco IP Phone 7800 Series Multiplatform Phones Administration Guide
23
About the Cisco IP Phone
Cisco IP Phone 7821

Cisco 7821 Specifications

General

Resolution	396 x 162 pixels
Lines	2
Speakerphone	Yes
Display	3.5-inch (89 mm) monochrome display
Ethernet Ports	2 x 10/100 Ethernet ports
Power	IEEE PoE Class 1
Headset Port	Yes
Protocols	SIP
Audio Codecs	G.711, G.722, G.729, iLBC
Weight	0.9 kg (1.98 lb)