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US 2011/0216783 A1Published application
Sending apparatus, receiving apparatus, and transmission system
AssigneeHitachi, Ltd.
InventorsHiroshi Takeuchi, Koji Takatori, Yasuyuki Fukashiro, Kohei Mandai, Hidemasa Narita
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Abstract
A transmission system is provided in a synchronous network, for establishing synchronization with a degree of precision and at a speed being comparable levels as a conventional technique, and further decreasing the probability of out-of-synchronization occurrence. In the present invention, a synchronization signal is detected without performing error correction until synchronization is established, and after the synchronization is established, it is monitored whether or not out-of-synchronization occurs, according to the synchronization signal that has been subjected to the error correction.
Claims11
A sending apparatus for sending a signal via a network, comprising,
- a header generator which generates header information including a first synchronization signal, a second synchronization signal, and information relating to user data as a transmission target, being inputted from an external device,
- an FEC (Forward Error Correction) generator which generates FEC data for correcting an error in a portion other than the first synchronization signal in the header information generated by the header generator and in the user data,
- a frame generator which uses the user data as a payload to generate a transmission frame including the header information, the payload, and the FEC data, and
- a sending unit for sending via the network, the transmission frame generated by the frame generator.
1 more element
A receiving apparatus for receiving a transmission frame that is sent via a network,
- the transmission frame including header information, a payload, and FEC (Forward Error Correction) data,
- the header information including a first synchronization signal and a second synchronization signal, and
- the FEC data being data for correcting an error in a portion other than the first synchronization signal in the header information and in the payload,
- the receiving apparatus comprising,
- a synchronization establishing unit for establishing frame synchronization by detecting the first synchronization signal in the header information of the transmission frame,
- an FEC execution unit for executing error correction in the head information and in the payload, by using the FEC data within the transmission frame, after the synchronization establishing unit has established the frame synchronization,
- an out-of-synchronization monitor for making a judgment whether or not the frame synchronization is maintained, by determining whether or not the second synchronization signal included in the header information having been subjected to the error correction by the FEC execution unit matches a signal pattern being predetermined, and
- a data output unit for extracting the payload within the transmission frame when the out-of-synchronization monitor determines that the frame synchronization is maintained, and outputting the payload to an external device.
5 more elements
A transmission system comprising,
- a sending apparatus for sending a transmission frame via a network, and
- a receiving apparatus for receiving the transmission frame that is sent via the network, wherein,
- the sending apparatus comprises,
- a header generator which generates header information including a first synchronization signal, a second synchronization signal, and information relating to user data as a transmission target, being inputted from an external device,
- an FEC (Forward Error Correction) generator which generates FEC data for correcting an error in a portion other than the first synchronization signal in the header information generated by the header generator and in the user data,
- a frame generator which uses the user data as a payload to generate a transmission frame including the header information, the payload, and the FEC data, and
- a sending unit for sending via the network, the transmission frame generated by the frame generator, and
- the receiving apparatus comprises,
- a synchronization establishing unit for establishing frame synchronization by detecting the first synchronization signal within the header information of the transmission frame,
- an FEC execution unit for executing error correction in the head information and in the payload, by using the FEC data within the transmission frame, after the synchronization establishing unit has established the frame synchronization,
- an out-of-synchronization monitor for making a judgment whether or not the frame synchronization is maintained, by determining whether or not the second synchronization signal included in the header information having been subjected to the error correction by the FEC execution unit matches a signal pattern being predetermined, and
- a data output unit for extracting the payload within the transmission frame when the out-of-synchronization monitor determines that the frame synchronization is maintained, and outputting the payload to an external device.
9 more elements
Dependencies are inferred from the claim text.