If monitoring the forward direction in SAT-B, SAT-M or SAT-mM, it is necessary to extract information from the control channel (NCSC) in order to achieve for proper decoding.
The following stand-alone traffic channel decoders are available:
•SAT-B-C-TFC
•SAT-B-L-TFC
The SAT-B-C-TFC-mode can be started via the GUI, whereas the SAT-B-L-TFC can only be started via the XML-RCI.
For proper decoding the SAT-B-L-TFC decoder requires the MES ID and service type (TEL, FAX, DATA) from the control channel. The user may start traffic channel decoding by setting these two parameters in addition to the offset frequency.
The following picture shows the XML parameter set for the SAT-B-L-TFC mode.