EXFO FTB-800 Series for FTB-1 - Manual (Page 224)

Test Setup - Test Configurator, Timer, and System
214 FTB-700G/800 Series
Signal - Signal Configuration (SONET/SDH)
Signal - Signal Configuration (SONET/SDH)
From the Test menu, tap Setup, Test Configurator, the interface block,
and the Signal tab.
OC/STM Signal

Synchronization Status Message (S1): Bits 5 through 8 of the S1 byte
are used to convey synchronization status of the NE. Not available with
Through topology.
Bits
5 to 8
Description
SONET SDH
0000
(default)
Synchronized - Traceability Unknown (STU) Quality Unknown
0001 Stratum 1 Traceable (ST1) Reserved
0010 Reserved ITU G.811 (PRC)
0011 Reserved Reserved
0100 Transit Node Clock Traceable (TNC) SSU-A
0101 Reserved Reserved
0110 Reserved Reserved
0111 Stratum 2 Traceable (ST2) Reserved
1000 Reserved SSU-B
1001 Reserved Reserved
1010 Stratum 3 Traceable (ST3) Reserved
1011 Reserved ITU-T G.813 Option I (SEC)
1100 SONET Minimum Clock Traceable (SMC) Reserved
1101 Stratum 3E Traceable (ST3E) Reserved
1110 Provisionable by the Network Operator (PNO) Reserved
1111 Don’t Use for Synchronization (DUS) Do not use for synchronization