EXFO FTB-800 Series for FTB-1 - Manual (Page 289)

Test Results
NetBlazer 279
Alarms/Errors
Section/Line / RS/MS
Alarms

LOF-S (Loss Of Frame - Section) - SONET
RS-LOF (Regeneration Section - Loss Of Frame) - SDH
RX: A SEF (SONET)/RS-OOF (SDH) defect on the incoming optical
signal persists for at least 3 milliseconds.
TX: Generates non-valid framing bytes (A1 and A2).

SEF (Severely Errored Framing) - SONET.
RS-OOF (Regeneration Section - Out-Of-Frame) - SDH.
RX: A minimum of four consecutive errored framing patterns are
received.
TX: Generates four consecutive errored framing patterns.

TIM-S (Trace Identifier Mismatch - Section) - SONET
RS-TIM (Regeneration Section - Trace Identifier Mismatch) - SDH
RX: The received J0 Trace doesn’t match the expected message value.
Only available when Enable TIM-S/RS-TIM check box is selected (Refer
to Traces (SONET/SDH) on page 239).

AIS-L (Alarm Indication Signal - Line) - SONET
MS-AIS (Multiplex Section - Alarm Indication Signal) - SDH
RX: Bits 6, 7 and 8 of the K2 byte contain the “111” pattern in five
consecutive frames.
TX: Generates a SONET/SDH signal that contains a valid Section
Overhead (SOH) / Regenerator Section Overthead (RSOH) and an
all-ones pattern on the SPE.