Abstract: A bidirectional pentaplex system is connected to a machine room. The machine room provides a first optical signal, a second optical signal and a monitoring signal and transmits to the bidirectional pentaplex system. The bidirectional pentaplexer includes a first receiving unit, a second receiving unit, a first emitting unit, a second emitting unit, a filter, a transceiver, a grating, a plurality of reflecting units and a control circuit. The receiving units and the transceiver respectively receives the signals, then the control circuit controls the emitting units emitting the feedback signals and transmits the feedback signals back to the machine room.

Abstract: An active network monitoring system for detecting an abnormality at a position between a communication office and a client includes a first monitoring module disposed on the communication office, a second monitoring module disposed on the client and an optical splitter. The first monitoring module has a first processor and a first laser diode. The second monitoring module has a second processor and a second laser diode. The first processor sends a digital signal to the first laser diode. The first laser diode modulates the digital signal into an optical signal and sends the optical signal to the second monitoring module via the optical splitter. The second laser diode converts the optical signal back to the digital signal, and sends the digital signal to the second processor to generate an identification signal of the client. The identification signal is transmitted to the communication office via the second laser diode.

Abstract: A bidirectional pentaplex system is connected to a machine room. The machine room provides a first optical signal, a second optical signal and a monitoring signal and transmits to the bidirectional pentaplex system. The bidirectional pentaplexer includes a first receiving unit, a second receiving unit, a first emitting unit, a second emitting unit, a filter, a transceiver, a grating, a plurality of reflecting units and a control circuit. The receiving units and the transceiver respectively receives the signals, then the control circuit controls the emitting units emitting the feedback signals and transmits the feedback signals back to the machine room.

Abstract: An active network monitoring system for detecting an abnormality at a position between a communication office and a client includes a first monitoring module disposed on the communication office, a second monitoring module disposed on the client and an optical splitter. The first monitoring module has a first processor and a first laser diode. The second monitoring module has a second processor and a second laser diode. The first processor sends a digital signal to the first laser diode. The first laser diode modulates the digital signal into an optical signal and sends the optical signal to the second monitoring module via the optical splitter. The second laser diode converts the optical signal back to the digital signal, and sends the digital signal to the second processor to generate an identification signal of the client. The identification signal is transmitted to the communication office via the second laser diode.