EXFO FTB-8100 Series, User Manual

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SDH Tabs
SONET/SDH Application
287
LOP RX (SDH)
Alarm Analysis
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TU-AIS (Tributary Unit - Alarm Indication Signal): The TU-AIS alarm is
declared when V1 and V2 bytes for the TU path contain an all-ones
pattern in five consecutive superframes.
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TU-LOP
(Tributary Unit - Loss Of Pointer): The TU-LOP alarm indicates
that a valid pointer is not found in N consecutive superframes (where 8
≤ N ≤ 10), or if N consecutive NDFs (“1001” pattern) are detected.
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LP-RDI (Tributary Unit - Remote Defect Indication): The LP-RDI alarm
is declared when bit 8 of V5 byte contains “1” in five consecutive TU
superframes while bits 6 and 7 of the K4 byte contain the “00” or “11”
pattern.
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LP-RFI (Low Order Path - Remote Failure Indication) (available with
VC-11 only): The LP-RFI alarm is declared when bit 4 of V5 byte
contains “1” in five consecutive superframes.
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LP-TIM
(Low Order Path - Trace Identifier Mismatch): The LP-TIM
defect indicates that none of the sampled LP trace strings match the
expected message value. The LP-TIM alarm result is only available
when LP-TIM from J2 Trace section has been enabled.
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LP-PLM
(Low Order Path - Payload Label Mismatch): The LP-PLM is
declared upon receipt of five consecutive superframes with
mismatched LP Signal (bits 5 through 7 of the V5 byte are “000”, “001”
or “111”)
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LP-UNEQ
(Low Order Path - Unequipped): LP-UNEQ is declared when
bit 5 through 7 of the V5 byte contain “000” for five consecutive
superframes.
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ERDI-SD (Enhanced RDI - Server Defect): The ERDI-SD alarm is
declared when bits 5, 6, and 7 of the K4 byte contain the “101” pattern,
and bit 8 of the V5 byte contain “1”, in five consecutive LP superframes.