EXFO IQS-8100 Series Transport Blazer for IQS-600 - Manual (Page 233)

SONET Tabs
SONET/SDH Application 219
Section RX (SONET)
Section RX (SONET)
Press TEST, Sec-Line, and Section (under Sec-Line RX).
Error Analysis
FAS (Frame Alignment Signal): A FAS defect indicates that at least one A1
or A2 byte of the FAS word is in error.
B1 (BIP-8, Bit-Interleave Parity - 8 bits): The B1 (BIP-8) error indicates a
Section parity error by performing a routine even-parity check over all
frames of the previous STS-n signal (located in the first STS-1 of an STS-n
signal).
Alarm Analysis
³
SEF (Severely Errored Framing): A SEF defect indicates that a
minimum of four consecutive errored framing patterns are received.
³
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.
³
TIM-S (Trace Identifier Mismatch - Section): The TIM-S defect indicates
that the received J0 Trace doesn’t match the expected message value.
The TIM-S alarm is only available when Enable TIM-S check box from
J0 Trace section has been selected.