Multiple signal processing unit for utility wiring by receiver/LAN and utility wiring system by receiver/LAN

A utility wiring system by receiver/LAN comprising:

• a utility wiring by receiver/LAN;
• at least one booster (40) located in said utility wiring, for amplifying a signal received by the receiver;
• a bypass circuit (41) connected in parallel to said booster (40);
• a LAN signal pass circuit disposed in said bypass circuit (41), for passing LAN signal therethrough but cutting off the signal which is within a frequency range outside the frequency range of the LAN signal;
• and
• a plurality of units (30) connected to said utility wiring, for processing multiple signals transmitted through said utility wiring,
• wherein each of said plurality of units (30) further comprises:
• a pair of utility wiring connecting terminals (10) connected with each other for connecting to said utility wiring;
• at least one input-output terminal (11) for connecting a computer, said input-output terminal (11) being connected to said utility wiring connected to said utility wiring connecting terminals (10);
• at least one input-output terminal (12) for connecting the receiver, said input-output terminal (12) being connected to said utility wiring connecting terminals (10);
• and
• a first signal interference preventing circuit for preventing a reverse flow of the LAN signal, said circuit being connected between said utility wiring connecting terminals (10) and said each input-output terminal 12 for connecting the receiver.