In TV Project, there are Video Picture (TV Pictures) send by using OSN1500 and encoder/decoder equipments (Huawei Equipments) as the following:
Original TV Picture (Source) -- DS3_Out port of Encoder (DXT8800) � PL3_IN port of OSN1500 -- out Loop in PL3 -- PL3_OUT port of OSN1500 -- DS3_IN port of Decoder (DXT8300) -- TV Monitor (1741A Waveform/Vector Monitor).
So after the Traffic is lost from the Original we did not got any alarm in the PL3 Boards?
This idea because:
1. If the problem from Encoder to OSN1500 (Cable cut or no output from Encoder) so the result will be P-LOS Alarm in PL3 board, and in this case you can get the problem directly.
2. If the problem from the Source to the Encoder, (Cable cut or no output from Source) so in this case no any alarm display in the PL3 board, this because the Encoder in this case will generate signal (Color Bar Signal)to the OSN1500, so no any alarm in PL3 Board.