EXFO FTB-8100 Series, User Manual

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Common Tabs
SONET/SDH Application
367
Performance Monitoring (PM)
Far-End
³
EFS (Error Free Second): Gives the count of the seconds within which
no error occurred or when a defect is detected on the near-end.
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.826
,
G.828
,
G.829
,
M.2100 ISM
, and
M.2101 : Gives the count of the seconds within which one or more
anomalies (FAS, EB, etc.) occurred or at least one defect occurred.
³
SES (Severely Errored Second):
For
G.826
,
G.828
,
G.829
, and
M.2101
: Gives the count of the seconds
within which anomalies (FAS, EB, etc.) is
≥
X% or at least one defect
occurred. X = 30% for DSn/PDH signals; see the following table for
SONET/SDH signals.
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%