Stm-1 Error Measurements (Anomalies - Wavetek ANT-20 Operating Manual

ANT-20/ANT-20E
1.4.5

STM-1 error measurements (anomalies)

Evaluation
All errors (anomalies) are counted simultaneously and stored.
Gate times . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 to 99 seconds
Intermediate results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 to 99 seconds
Display
of anomalies via LEDs:
CURRENT
HISTORY
Display of errors as count or ratio values (equivalent bit error ratio): When calculating the ratio
value, correction formulae are used for the anomalies B1, B2, B3 and BIP-2 as well as MS-REI,
HP-REI and LP-REI. These take into account that a multiple error in the same bit can lead to
clearance of the error.
Anomaly
OOF -155
FAS-155
B1
B2
MS-REI
B3
HP-REI
CRC-4
E-Bit
TSE
CODE
Table S-5
Specifications
LED (red) is on when the anomaly is present
LED (yellow) is on if the anomaly has occurred at least once during the current
measurement interval.
LED
LOF/OOF
-
B1/B2
B1/B2
-
B3
-
FAS/CRC
-
TSE
-
LED display of possible anomalies (STM-1)
STM-1 mapping
or 1 to 99 minutes
or 1 to 99 hours
or 1 to 99 days
or 1 to 99 minutes
S-9