The symbol errors typically include coding symbol errors, e.g., violation of 8B10B
encoding rules.
?– Errored frame (errored frames per second) The total number of frame errors
detected during a specified period exceeds a certain predefined threshold.
?– Errored frame period (errored frames per N frames) The total number of
frame errors within the last N frames has exceeded a certain predefined threshold.
Both detection threshold and observation window size are customizable.
?– Errored frame seconds summary (errored seconds per M seconds) The
total number of errored seconds, defined in the standard as one second intervals
with at least one frame error within the last M seconds, has exceeded some predefined
threshold. Again, both detection threshold and observation window size
are customizable.
Since the IEEE 802.3ah-compliant OAM mechanism does not include OAMPDU delivery
guarantees and is a best-effort service, the Event Notification OAMPDU may
need to be sent multiple times to increase the probability of detection of the particular
event which is to be notified to the link partner. Such multiple events need to be recognized
by all OAM-enabled stations and discarded, and thus each Event Notification
OAMPDU is equipped with a serial number, providing thus the target link peer with
the ability to detect and discard multiplied event notification frames.
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