EXFO FTB-800 Series for FTB-1 - Manual (Page 279)

Test Results
NetBlazer 269
Alarms/Errors
OPUx
Note: OPUx is displayed under ODUx alarms/errors group.
Alarms

AIS (Alarm Indication Signal) .
RX: A PRBS11 pattern is received indicating a failure of the client
signal.
TX: Generates a PRBS11 pattern.

CSF (Client Signal Fail) .
RX: Bit 1 of the OPUk PSI[2] byte is set to “1” indicating a failure of the
client signal mapped into the OPUk of the OTN signal.
TX: Sets the bit 1 of the OPUk PSI[2] byte to “1”.

PLM (Payload Mismatch) is available when OPU-PLM check box is
selected.
RX: The Payload Structure Identifier (PSI) field do not match the
expected PT for at least 3 consecutive frames.