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ESs
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Errored Second (ES) is a second with one or more Coding Violations or one or more incoming defects, for example, SEF, LOS, AIS, LOP.
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SESs
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Severely Errored Second (SES) is a second with x or more Coding Violations (CV), or a second with at least one or more incoming defects.
The value of x is defined for a given Bit Error Rate (BER) as outlined in Annex 50A of the IEEE 802.3ae specification1.
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SEFSs
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Severely Errored Framing Second (SEFS) is a second containing one or more SEF events.
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CVs
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Coding Violations (CV) are Bit Interleaved Parity (BIP) errors that are detected in the incoming signal. CV counters are incremented for each BIP error detected.
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