The two objects h3cDot3OamErrSymPeriodThresholdHi and
h3cDot3OamErrSymPeriodThresholdLo together form an unsigned
64-bit integer representing the number of symbol errors that
must occur within a given window to cause this event.
This is defined as
h3cDot3OamErrSymPeriodThreshold =
((2^32) * h3cDot3OamErrSymPeriodThresholdHi)
+ h3cDot3OamErrSymPeriodThresholdLo
If h3cDot3OamErrSymPeriodThreshold symbol errors occur within a
window of h3cDot3OamErrSymPeriodWindow symbols, an Event
Notification OAMPDU should be generated with an Errored Symbol
Period Event TLV indicating the threshold has been crossed in
this window.