Signal separator and digital individual line access multiplexing system

The utility model is suitable for the field of communication, and provides a signal separator and a digital individual line access multiplexing system. The signal separator comprises a signal input terminal, a broad band signal output terminal and a voice signal output terminal, wherein the signal input terminal and the broad band signal output terminal are the same terminal physically, and an RLC (Radio Link Control) network filter is connected between the signal input terminal and the broad band signal output terminal and comprises at least four-grade cascading filtering units. Inductors of the RLC network filter are provided with a double-layered coil winding structure, so that the width of an attenuation band of the signal separator is greatly improved.