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Reference
3-44 GB1400 User Manual
TES: Threshold Errored Seconds: The number of seconds in the
measurement interval in which BER exceeds the threshold set by the
THRES parameter in the TEST Menu, minus the number of unavailable
seconds. Available threshold values are 1E-n, where n = 2, 3, ... 16.
TES = (seconds with BER ≥ Threshold) - US
US = unavailable seconds in the current interval
Degraded Minutes (DM): The number of 60 second intervals in the
current interval in which the BER exceeds the current test threshold
(THRES).
Percentage Degraded Minutes (%DM): The number of degraded
minutes expressed as a percentage of the total number of minutes in the
measurement interval.
% DM = ( DM / TM) * 100%
DM = degraded minutes in the measurement interval
TM = total minutes in the measurement interval
Unavailable Seconds (US): The number of seconds in unavailable
intervals. Unavailable intervals start upon the detection of 10 contiguous
severely errored seconds (SES), and end upon the detection of 10 non-
severely errored seconds.
Percentage Unavailable Seconds (%US): The number of unavailable
seconds expressed as a percentage of total seconds in the measurement
interval.
% US = ( US / TS) * 100%
US = unavailable seconds in the measurement interval
TS = total seconds in the measurement interval
Error History Indicators
CLEAR
SYNC LOSS
BIT
PHASE
POWER
The Analyzer (performance) history indicators are
located in the ERROR HISTORY section of the front
panel. These indicators will latch on when the indicated
event occurs, and can be cleared by the user.
SYNC LOSS: This indicator will turn on if the LOCK LED turns off;
that is if the BER rises above the current synchronization threshold (See
Synchronization (LOCK) Threshold in Chapter 4)
BIT: Will turn on if a bit error is detected.
PHASE: Will turn on if a phase error is detected. The Analyzer will
report a phase error when the active clock edge moves too close to the
data waveform transition point thus violating the input circuit setup or
hold time.
POWER: Will turn on after a power loss has occurred.