Abstract: A physical layer with power off alert (POA) and the alerting method thereof. It uses a power detector to detect the power supplied to the physical layer, and uses a POA packet generator to generate a POA packet when the supplied power is off. Therefore, it can use the POA packet transmitted on the network to notify the user of the opposite nodes or other nodes on the network.

Abstract: A physical layer with smart cable analyzing (SCA) and the apparatus employing the same. When poor quality is possibly found in the cable connecting to the physical layer, its loop back controller is used to control the timing for entering into the loop back test mode, so as to analyze the cable quality and assist the user to exclude the root cause of the problem.

Abstract: An apparatus and a method for electric current control are provided. The electric current control apparatus is connected with a first electronic device and a second electronic device. Under a condition not having additional power supply, the electric current control apparatus can rectify and amplify an electric current of a finite current source from the first electronic device, and output the rectified and amplified electric current to the second electronic device. Further, the electric current control apparatus can charge up a charger module thereof with the electric current of the finite current source and combine an electric current from the charger module after being charged with the electric current of the finite current source, and then provide the combined electric current for the second electronic device for usage.