EXFO FTB-8100 Series, User Manual

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Common Tabs
SONET/SDH Application
363
Performance Monitoring (PM)
Near-End
³
EFS (Error Free Second) ( G.821 , G.826 , G.828 , and G.829 ): Gives the
number of seconds within which no error occurred.
³
EC (Error Count) ( G.821 only): Gives the number of bit errors.
³
EB
(Errored Block) (
G.826
,
G.828
, and
G.829
): Gives the count of
blocks in which one or more bits are in error.
³
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, EB, etc.)
occurred, or at least one defect occurred.
³
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, EB, etc.) are ≥ X% or at least one defect
occurred. X = 30% for DSn/PDH signals; see the following table for
SONET/SDH signals SES threshold.
STS-1
STM-0
OC-3
STM-1
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%