EXFO FTB/IQS-85100G Packet Blazer for FTB-500/IQS-600 - Manual (Page 185)

Test Results
Packet Blazer 175
Alarms/Errors
Ethernet - PCS Lanes
Note: Available with parallel interface only: 40/100Gbit/s Ethernet and OTN with
40/100GbE Ethernet client.

Skew Alarm Threshold (bits), available with Ethernet test application,
allows to set the threshold value that will be used to declare a skew
alarm. The default value is 928 for 100G and 1856 for 40 G.

Default restore the default skew alarm threshold value.
Alarms
Note: Alarms are only available with Ethernet test applications.

LOA (Loss Of Alignment)
RX: Two or more logical lanes have the same logical lane marker
value, or one or more logical lane marker recovery processes are in the
OOR state, or if the differential delay between two logical lanes
exceeds the configured alarm threshold compensable delay.

Inv. Mapping (Invalid Mapping)
RX: Indicates errors in the mapping attributed to either a mapping
value appearing more than once or a non valid mapping value (out of
range).

LOBL (Loss of Block Lock)
RX: In lock mode, 65 invalid sync fields (00 or 11) within a 1024 sync
window are received. A PCS Lane Lock alarm is cleared when
receiving 64 consecutive valid 66b sync field (01 or 10) in a row.