A communication system transmits relay data through a communication path including a plurality of sections in which different communication schemes are used. A relay communication device is provided between a first section and a second section which are adjacent sections. The relay communication device includes a receiving unit receiving the relay data from the first section through a frame of a first communication scheme, and a relaying unit configuring, in a frame of a second communication scheme used to transmit the relay data to a relay destination, signal quality information representing signal quality calculated for a physical link in each of the sections through which the relay data is transmitted before arriving at the relay communication device, and outputting the frame of the second communication scheme to the second section.

An optical wavelength multiplex transmission system includes a redundant configuration composed of an active system and a standby system between a first terminal station apparatus and a second terminal station apparatus. The first terminal station apparatus includes a light source configured to output dummy light, a coupler configured to insert the dummy light into the standby system, and a control unit configured to vary the dummy light. The second terminal station apparatus includes a coupler configured to extract the dummy light from the standby system and a detector configured to detect the extracted dummy light. The optical wavelength multiplex transmission system can identify a route of the standby system between the first terminal station apparatus and the second terminal station apparatus according to a result of the detection by the detector and check whether the standby system is normal.

An optical wavelength multiplex transmission system includes a redundant configuration composed of an active system and a standby system between a first terminal station apparatus and a second terminal station apparatus. The first terminal station apparatus includes a light source configured to output dummy light, a coupler configured to insert the dummy light into the standby system, and a control unit configured to vary the dummy light. The second terminal station apparatus includes a coupler configured to extract the dummy light from the standby system and a detector configured to detect the extracted dummy light. The optical wavelength multiplex transmission system can identify a route of the standby system between the first terminal station apparatus and the second terminal station apparatus according to a result of the detection by the detector and check whether the standby system is normal.

A communication system transmits relay data through a communication path including a plurality of sections in which different communication schemes are used. A relay communication device is provided between a first section and a second section which are adjacent sections. The relay communication device includes a receiving unit receiving the relay data from the first section through a frame of a first communication scheme, and a relaying unit configuring, in a frame of a second communication scheme used to transmit the relay data to a relay destination, signal quality information representing signal quality calculated for a physical link in each of the sections through which the relay data is transmitted before arriving at the relay communication device, and outputting the frame of the second communication scheme to the second section.

A fault detection method and device is disclosed. The method includes obtaining, by an optical transport network (OTN) device, a first OTN frame. The first OTN frame includes a plurality of payload areas. Each payload area includes payload check information and payload data. The method further includes performing fault detection, according to the payload check information, of payload data of a payload area in which the payload check information is located. The first OTN frame is divided into a plurality of payload areas, and corresponding payload check information is carried in each payload area.

A method for measuring transmission delay of an optical transport network (OTN) device and a source OTN device. The method comprises: a source OTN device receives a delay measurement request transmitted by a user, generates a delay request frame, and transmits the delay request frame to a destination OTN device; the source OTN device receives a response frame returned from the destination OTN device, the response frame including a first time information; after receiving the response frame returned from the destination OTN device, the source OTN device obtains the system time T4 at when the response frame is received by the source OTN device; the source OTN device parses the response frame to obtain the first time information, and calculates the transmission delay between the source OTN device and the destination OTN device according to T4 and the first time information.

An electronic device is provided. The electronic device includes: a first board that time-divides each of a plurality of parallel data and generates a plurality of packets corresponding to each time period based on levels of each of the plurality of parallel data included in each time period in order to convert the plurality of parallel data into serial data; and a second board that determines levels of each of the plurality of parallel data in each time period to convert the serial data into the plurality of parallel data when the serial data are received from the first board, in which the first board may convert the data into a first signal or a second signal based on the levels of the data included in each time period in order to generate the packets.

A fault detection method and device is disclosed. The method includes obtaining, by an optical transport network (OTN) device, a first OTN frame. The first OTN frame includes a plurality of payload areas. Each payload area includes payload check information and payload data. The method further includes performing fault detection, according to the payload check information, of payload data of a payload area in which the payload check information is located. The first OTN frame is divided into a plurality of payload areas, and corresponding payload check information is carried in each payload area.

The invention discloses a method, in an OLT in a passive optical network, of identifying a long-shining rogue ONU, the method comprising the steps of: A. allocating a specific radio frequency signal at a different frequency to each of ONUs in the passive optical network; and B. when the long-shining rogue ONU is detected in the passive optical network: b1. broadcasting a control message to each of the ONUs; b2. receiving uplink signals in the uplink; b3. recovering the specific radio frequency signals transmitted by the normal ONUs from the uplink signals; and b4. identifying an absent specific radio frequency signal according to the recovered specific radio frequency signals, wherein the ONU corresponding to the absent specific radio frequency signal is the long-shining rogue ONU. The invention further discloses an OLT device performing the method and a method, in an ONU, of assisting the OLT in identifying a long-shining rogue ONU.

An electronic device is provided. The electronic device includes: a first board that time-divides each of a plurality of parallel data and generates a plurality of packets corresponding to each time period based on levels of each of the plurality of parallel data included in each time period in order to convert the plurality of parallel data into serial data; and a second board that determines levels of each of the plurality of parallel data in each time period to convert the serial data into the plurality of parallel data when the serial data are received from the first board, in which the first board may convert the data into a first signal or a second signal based on the levels of the data included in each time period in order to generate the packets.