User guide

Errored 0's Ratio
The ratio of the errored 0's count to the bit count is displayed here to 4
significant digits.
Errored 0's Count
The number of logic 0's measured as logic 1's during the accumulation period
is displayed here.
Auto Resync Counter
The total number of Auto Re-Sync Count received in a time interval is displayed
here.
G.821 Measurements
Availability
The ratio of the available seconds to the total gating period expressed as a
percentage.
Unavailability
The error ratio is calculated over 1 second timed intervals during the gating
period. An unavailable period begins when the error ratio is worse than 1 x
10
-3
for 10 consecutive seconds. These 10 seconds are considered part of the
unavailable time. The unavailable period ends when the error ratio is better
than 1 x 10
-3
for 10 consecutive seconds. These 10 seconds are considered part
of the available time. Percent (%) Unavailability is the ratio of the unavailable
seconds to the total gating period expressed as a percentage.
Severely Errored Seconds
The ratio of the total number of available seconds with an error ratio worse
than 1 x 10
-3
to the total number of available seconds, expressed as a
percentage.
Degraded Minutes
Severely errored seconds are discarded from the available time and the
remaining seconds are grouped into blocks of 60 seconds. Blocks which have
an error ratio worse than 1 x 10
-6
are called Degraded Minutes and Percent (%)
Degraded Minutes is the ratio of the total number of degraded minutes to the
total number of 60 second blocks in the available time expressed as a
percentage. Incomplete blocks of less than 60 seconds are treated as complete
blocks of 60 seconds.
Errored Seconds
The ratio of the errored seconds in the available time to the total number of
seconds in the available time, expressed as a percentage.
Evaluating Results 7
Agilent J-BERT N4903B High-Performance Serial BERT 381