Interface Configuration and Interpretation
Clear Points | Clears all points from the display grid. |
Readings |
|
MER (dB) | (Modulation Error Ratio) Provides a single 'figure of merit' for |
| received signal. It is the ratio of 'ideal signal vectors' to 'errored |
| signal vectors' expressed in dB. MER is similar to a |
| |
EVM (%) | (Error Vector Magnitude) Closely related to, and can normally |
| be calculated from, MER. It is a ratio of 'errored signal vectors' |
| to maximum signal amplitude expressed as a percentage |
| (ref: TR 101 290 Annex). |
BER | (Bit Error Rate) Provides an indication of the Forward Error |
| Correction workload. |
TEFs | (Transport Error Flag or TEI transport error indicator) Indicates |
| the Forward Error Correction failure. |
Lock | If the QAM interface is able to acquire full lock onto the channel |
| and is receiving the signal correctly, the Lock indicator will |
| light up green. Red indicates that lock cannot be achieved. Gray |
| indicates that a signal is not present. |
Settings |
|
Update (s) | Allows the period in seconds between samples of the incoming |
| signal to be set. |
Persist | Allows the time that the dots persist on the grid display to be set. |
Log |
|
File | Constellation data can be written to the file identified in this |
| field; data is saved in csv format. |
MTM400 MPEG Transport Stream Monitor User Manual |