Keysight Technologies, Inc.

Keysight Technologies Singapore Pte. Ltd.

Sanjay Cartic

Gerald Raymond Pepper

Hadrien Louchet

Brian Fuchs

A method for reconstructing uncorrectable forward error correction (FEC) data includes generating and transcoding a known bit sequence and transmitting a FEC encoded codeword that includes a payload containing the transcoded known bit sequence through a component under test. The method further includes receiving the FEC encoded codeword transmitted via the component under test and determining that the encoded contents of the FEC encoded codeword contains a number of symbol errors that exceeds a predefined threshold. The method also includes utilizing stored scramble seed bits corresponding to an immediately preceding FEC encoded codeword and the transcoded known bit sequence to generate a reconstructed codeword.

Methods, systems and computer readable media for reconstructing uncorrectable forward error correction (FEC) data

Conventional test systems can experience issues when attempting to test network nodes or system with realistic high speed forward error correction (FEC) encoded test data. For example, a test system may use a packet data generator to generate eight data streams or lanes of 50 Gigabits per second (Gbps) test data and may then use a multiplexer to combine the eight lanes into a 400 Gbps data stream for transmission using 4-level pulse amplitude modulation (PAM4). To generate a high speed data stream comprising multiple data lanes, the test system may be required to use a master clock or other time synchronization technique to keep the data lanes in sync. Further, to generate an FEC encoded high speed data stream comprising multiple data lanes, the test system may perform FEC encoding across all of the data lanes comprising the high speed data stream, which can make test data modifications difficult afterwards. Hence, issues can arise if a packet data generator lacks capabilities, e.g., analog distortion or analog fuzzing features, that are needed for testing some aspect of network node functionality.

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Woodland Hills, CA, United States of America

Sanjay Cartic