The Cisco 8851 IP phone model looks like this:
Here's how to connect it:
NUMBERS 1-3 NOT NEEDED: Power comes from #4
1
DC adaptor port (DC48V). (NOT NEEDED)
2
AC-to-DC power supply. (NOT NEEDED)
3
AC power wall plug. (NOT NEEDED)
4
Network port (10/100/1000 SW) connection. (FROM WALL)
5
Access port (10/100/1000 PC) connection. (TO COMPUTER/DOCKING STATION)
6
Auxiliary port.(Used with headset)
7
Handset connection.
8
Analog headset connection (optional).