Exfo RTU 310-310G IP Services Test Head User Manual download pdf (Page 256)

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101

WIS Tabs

244 FTB-8500 Series and FTB-8120NGE/8130NGE

WIS RX

 REI-L (Remote Error Indicator - Line): The REI-L error is declared

when bits 5 through 8 of the M0 byte contain one pattern from the

following binary range: “0001” through “1000” (1 to 8) (located in the

first STS-1 of an STS-n signal).

 REI-P (Remote Error Indicator - Path): The REI-P error is declared

when bits 1 through 4 of the G1 byte contain one pattern from the

following binary range: “0001” through “1000” (1 to 8) (located in every

STS-1 of an STS-n signal).

Alarm Analysis

 SEF (Severely Errored Framing): A SEF defect indicates that a

minimum of four consecutive errored framing patterns are received.

 LOF (Loss Of Frame): A Loss Of Frame alarm indicates that a Severely

Error Framing (SEF) defect on the incoming SONET signal persists for

at least 3 milliseconds.

 AIS-L (Alarm Indication Signal - Line): The AIS-L alarm is declared

when bits 6, 7 and 8 of the K2 byte contain the “111” pattern in five

consecutive frames.

 RDI-L (Remote Defect Indication - Line): The RDI-L alarm is declared

when bits 6, 7, and 8 of the K2 byte contain the “110” pattern in five

consecutive frames.

 AIS-P (Alarm Indication Signal - Path): The AIS-P alarm is declared

when the H1 and H2 bytes for a STS path contain an all-ones pattern in

three consecutive frames or more.

 RDI-P (Remote Defect Indication - Path): The RDI-P alarm is declared

when bits 5, 6 and 7 of the G1 byte contain the “100” or “111” pattern in

ten consecutive frames.

 LCD-P (Loss of Code-Group Delineation - Path): Indicates that the

signal synchronization has been lost and valid code-groups are no

longer being delineated from the received payload stream being

passed to the PCS.

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Exfo RTU 310-310G IP Services Test Head User Manual Page 256

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