Zhone IMACS 8000 User Manual page 469

HSU Card
UAS
An Unavailable Second (UAS) is any second during which service is unavailable. An
unavailable signal state is declared after ten consecutive SESs (Severely Errored Seconds) are
logged. An unavailable state is cleared after ten consecutive non-Severely Errored Seconds
are logged.
SES
A Severely Errored Second (SES) is any second in which the BER exceeds 1x10
BES
A Bursty Errored Second (BES) is any second in which the BER is between zero and 1x10
LOFC
The Loss of Frame Count (LOFC) is the accumulation of the number of times an LOF (Loss
Of Frame) is declared. An LOF is declared after 2.5 seconds of a continuous LOS (Loss Of
Synchronization) or OOF (Out-Of-Frame) condition. The LOF is cleared after one second
without an LOS or OOF condition.
LOPS
A Loss of Packet Second (LOPS) is any second during which no remote data is received. This
is valid only for local statistics.
STATUS
If one of the errors above occurs during any 15-minute interval, the status column for that
period displays the code for that error. The codes are displayed at the bottom of the screen.
The possible Status values are T (test; port is in loopback), L (loss of synchronization, with 2
out of 4 frame bits in error), and E (excessive error rate).
Data Cards
HSU Card User Screens and Settings
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