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DS3 Measurement Reference
Bit Error Measurements Screens 1, 2, and 3
Measurement
Description
%EFS
Percentage of DS3 error-free seconds: DS3 EFS
expressed as the percentage of the total number of
seconds in the test.
Sync ES
DS3 synchronous errored seconds: The number of
seconds in which at least one DS3 bit error occurred
(seconds are counted beginning at the error occurrence).
Sev ES
DS3 severely errored seconds (SES): The number of
seconds during which the error rate was 10–3 or greater
(approximately 44,100 errors per second or more for
framed modes, 44,700 for unframed).
Avail Sec
DS3 available seconds: The number of seconds during
the test that were not unavailable (see below).
Unavail Sec
DS3 unavailable seconds: The DS3 is declared
unavailable after ten consecutive seconds of SES or LOP.
The DS3 is declared available again after ten consecutive
seconds with no SESs or LOPs.
Thrsh E-N
DS3 threshold seconds: The number of available seconds
during which the bit error rate or P-bit error rate (which
ever is larger) exceeded the indicated threshold. The
thresholds correspond to the following values
(Framed/unframed): E-3 = 44,100/44,700; E-4 = 4,410/4,470;
E-5 = 441/447; E-6 = 44/44.
Dribble
DS3 dribbling error seconds: The number of seconds in
which the error rate does not exceed 10–6 (approximately
1 through 43 errors).
CSES3
DS3 Consecutively severely-errored seconds count: The
number of SESs for which the previous two seconds were
also SESs. This count is reset during LOS, LOF, and LOP.
Burst ES
DS3 burst error seconds: The number of seconds in
which 100 or more bit errors occurred.
8–5
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DS3
DS3 Bit Error Measurements, continued