EXFO FTB-860, Руководство пользователя, Страница: 348 / 409

Common Test Setup, Results, and Functions
336
FTB-860/880
Alarms/Errors - WIS

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.

LOP-P (Loss Of Pointer - Path): For non-concatenated payloads, the
LOP-P
alarm indicates that a valid pointer is not found in N consecutive
frames (where 8 = N = 10), or N consecutive NDFs ("1001" pattern) are
detected.

PLM-P (Payload Label Mismatch - Path): The PLM-P is declared upon
receipt of five consecutive frames with mismatched STS signal labels.

UNEQ-P (Unequipped - Path): UNEQ-P is declared when the C2 byte
contains “00 H" in five consecutive frames.

ERDI-P (Enhanced RDI - Path): The ERDI-P alarm is declared when
bits 5, 6 and 7 of the G1 byte contain the “010" pattern in five to ten
consecutive frames.

WIS Link Down
:
WIS Link Down
is declared when at least one of the
following errors is present: AIS-P, LOF, PLM-P, SEF, LOP, or AIS-L.

PLM-P/UNEQ-P
(Payload Label Mismatch - Path / Unequipped - Path):
Allows enabling the Signal Label Mismatch for the expected message
defined as well as
UNEQ-P
monitoring.