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SDH Performance Monitoring

Definitions
According to G.826 PM data, the following definitions are used:

Errored second (ES)
A one second period with one or more errored blocks or at least one defect.

Severely errored second (SES)
A one second period which contains >= 30% errored blocks or at least one defect

Background block error (BBE)
An errored block not occurring as a part of a SES

Unavailable seconds (UAS)
A period of unavailable time begins at the onset of ten consecutive SES events. These ten seconds are considered to be part of unavailable time. A new period of available time begins at the onset of 10 consecutive non-SES events. These ten seconds are considered to be part of available time. UAS is the number of second of unavailable time.

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