Various connections to allow phone extensions.  
 
  One 10/100 Ethernet connection to connect to enterprise LAN network (8002 set).  
  Two 10/100/1000 Ethernet connection to connect to enterprise network (LAN) and a PC 
(8012 set).  
  1 mini-USB connector for a specific AC/DC power supply. To be used only if your phone 
requires an external power supply. Please refer to your installer.  
  1 RJ9 connector for a corded handset.