VeEX VePal CX350, User Manual

Page: 42 / 81

7.8.1.1 RP Level Measurements
The following setups are displayed and measurements are calculated:
Center Frequency (MHz)
Symbol rate (symbols/second)
Modulation type (QPSK, QAM-16, QAM-64, QAM-128, QAM-256)
Digital Carrier Level in dBmV or dBuV
Modulation Error Ratio (MER) in dB
Pre-FEC rate
Post FEC rate
Pre Errored Seconds count
Post Errored Seconds count
Severely Errored Seconds count
Return Path Level Measurement
Note: Forward Error Correction (FEC)
- FEC can only correct errors up to a point, after which errors are passed onto the decoding circuitry.
- Pre & Post FEC BER provides an indication of how "hard" the FEC circuitry is working to correct errors.
The harder it’s working, the closer the system is to failure
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7.8.1.2 RP Constellation Measurements
The following setups are displayed and measurements calculated:
Center Frequency (MHz)
Symbol rate
CX350 e-Manual D07-00-037 RevC01 Page 42 of 81