Patent ID: 9154311
Filing Date: 2015-10-06
Classification: H04L

Abstract:
1. A coupling device to couple a supply power source to a communication cable, comprising: an input side to be coupled to the supply power source; an output side to be coupled to a first end of the communication cable; a controllable switch unit coupled to the output side, and having a first, a second and a third state; and a controller to control a switch setting of the controllable switch unit, wherein in the first state of the controllable switch unit, the first end of the cable is operated in an idle state, when the first end is coupled to the output side, and a voltage of the cable is detected, and the setting of the controllable switch unit is changed from the first state to the second state, if the detected voltage is below a threshold level, in the second state of the controllable switch unit, the output side is coupled to the controller, and, in the condition where the first end of the cable is connected to the output side, the controller is configured to check the reception of an identification signal indicating to the controller that a coupling device to couple a load to the cable is connected to a second end of the cable, and the setting of the controllable switch unit is changed from the second state to the third state, if the identification signal is identified by the controller, and wherein, in the third state of the controllable switch unit, the controllable switch unit connects the input side to the output side.