Installation and first-time operationeud-1279/1.0 – R1.0 – 12.2010 85Connecting the power supplyIf your LAN supports Power-Over-Ethernet (PoE), the phone will be powered via theLAN cord and you will not require a power adapter.If your LAN does not support PoE or if you have installed a switch between the LANand the phone that does not support PoE, you will need the optional power adapterto power the phone.• Plug the round connector of the power cord on the underside of the phone intothe power socket.• Desk installation only: To relieve the strain on the cable feed the cable through oneof the cable guides on the stand rest.• Connect the power supply to the mains.Logging the IP phoneYour system administrator has to prepare the system before you can log on yourphone.Note:Only use the optional original plug-in power adapter.