Abstract: A network hub or a network switch including a housing which holds all elements of the network hub; a trunk interface control unit which is the control center of the network hub for controlling the operation of the other units of the network hub; a power supply unit connected to the trunk interface control unit to provide the network hub with the necessary operating power; a plurality of modular jacks adapted for receiving network lines for data input and output; a plurality of data handling units respectively connected between the trunk interface control unit and the modular jacks for handling input data and output data; a functional operand unit connected to the trunk interface control unit for calculating network line connection condition, network line utilization rate, data collision rate and network line inspection condition; a voice function control unit connected to the trunk interface control unit for controlling the functional operand unit to output its computed result, and a LED controller controlled