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How does ONT generate 40GE and 100GE PCS HI BER alarm?

Question asked by viavisupport on Nov 29, 2018
Latest reply on Nov 29, 2018 by viavianswers

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How does ONT generate the 40GE and 100GE PCS HI BER alarm?

viavianswers Nov 29, 2018 4:29 AM

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The IEEE 802.3 BER state diagram defines a PCS HI BER threshold of 97 invalid 66B sync headers within a 1.25ms window for 40GE and within a 500µs window for 100GE. This equates to an invalid sync header rate of approximately 1.24E-4.

ONT generates the PCS HI BER alarm by inserting approximately 133 invalid sync headers within the applicable window for 40GE and 100GE. This equates to an invalid sync header rate of approximately 1.7E-4 and exceeds the threshold defined by the standard.

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viavianswers Nov 29, 2018 4:29 AM
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Correct Answer
The IEEE 802.3 BER state diagram defines a PCS HI BER threshold of 97 invalid 66B sync headers within a 1.25ms window for 40GE and within a 500µs window for 100GE. This equates to an invalid sync header rate of approximately 1.24E-4.

ONT generates the PCS HI BER alarm by inserting approximately 133 invalid sync headers within the applicable window for 40GE and 100GE. This equates to an invalid sync header rate of approximately 1.7E-4 and exceeds the threshold defined by the standard.
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