Interface Configuration and Interpretation
Input Card Screen - QAM Annex B II
Figure
Two LED indicators are available on the Readings section of the screen:
FEC Lock | Forward Error Correction Lock, which displays the status of the |
| deinterleaver and Reed Solomon decoder. |
RF Lock | If full lock is acquired onto the channel and it is receiving the |
| signal correctly, the RF Lock indicator will light up green. When |
| a signal is present but no lock is achieved, the indicator is red. |
| When no signal is found, the indicator is gray. |
The following graphs, which can be selected from the Graph
RF ConstellationI and Q data are collected from the QAM front end and displayed as a conventional constellation of 256 points by 256 points. The samples collected are not real time, so there is some dwell (delay) before a complete constellation is displayed. The persistence of the display can be varied using the Persist slider control at the bottom of the graph.
MTM400 MPEG Transport Stream Monitor User Manual |