EXFO FTB-8100 Series Transport Blazer for FTB-200 - Manual (Page 150)

OTN Tabs
138 FTB-8100 Series Transport Blazer
OTU RX
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OTU-AIS (OTU - Alarm Indication Signal): OTU-AIS is declared when
polynomial number 11 (PN-11) is over all OTU frame bits including FAS
and MFAS for at least 3 consecutive 8192 bit-interval.
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OTU-TIM (OTU - Trace Identifier Mismatch): OTU-TIM is declared
when expected SM SAPI and/or SM DAPI do not match the received SM
SAPI and/or DAPI for at least 3 consecutive TTI. This alarm is only
available when the Enable TIM SAPI and/or DAPI check boxes are
selected from OTU TTI RX on page 140.
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OTU-BDI (OTU - Backward Defect Indication): OTU-BDI is declared
when the BDI bit in the SM overhead field (byte 3, bit 5) is “1” for at
least 5 consecutive OTU frames.
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OTU-IAE (OTU - Incoming Alignment Error): OTU-IAE is declared when
IAE bit in the SM overhead field (byte 3, bit 6) is “1” for at least 5
consecutive OTU frames.
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OTU-BIAE (OTU - Backward Incoming Alignment Error): OTU-BIAE is
declared when BEI/BIAE bits in the SM overhead field (byte 3, bits
1 to 4) are “1011” for at least 3 consecutive frames.
Note: Refer to Alarm/Error Measurements on page 44 for H/C LEDs and Seconds
information.