EXFO FTB-1, User Manual

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Test Results
366
FTB-700G/800 Series
Performance Monitoring
Near-End

EFS (Error Free Second) ( G.821 , G.826 , G.828 , and G.829 ): Gives the
number of seconds within which no error occurred.

EC (Error Count) ( G.821 only): Gives the number of bit errors.

EB
(Errored Block) (
G.826
,
G.828
, and
G.829
): Gives the count of
blocks in which one or more bits are in error.

ES
(Errored Second)
For G.821 , and M.2100 OOSM : Gives the number of seconds within
which one or more bit error occurred, or during which Loss Of Signal
(LOS) or AIS is detected.
For
G.826
,
G.828
,
G.829
,
M.2100 ISM
, and
M.2101
: Gives the number
of seconds within which one or more anomalies (FAS (DSn/PDH), EB,
etc.) occurred, or at least one defect occurred.

SES (Severely Errored Second)
For
G.821
, and
M.2100 OOSM
: Gives the number of seconds within
which a bit error ratio is

10
-3
, or during which one defect (LOS/AIS) is
detected.
For G.826 , G.828 , G.829 and M.2101 : Gives the number of seconds
within which anomalies (FAS (DSn/PDH), EB, etc.) are  X percent or
at least one defect occurred. X=30 percent for DSn/PDH signals; see
the following table for SONET/SDH signals SES threshold.
OC-1
STS-1e
STM-0
STM-0e
OC-3
STS-3e
STM-1
STM-1e
OC-12
STM-4
OC-48
STM-16
OC-192
STM-64
Path 30% 30% 30% 30% 30%
Line/MS 15% 15% 25% 30% 30%
Section/RS 10% 30% 30% 30% 30%