4-16
Section 4: Operation
Moseley SL9003Q
602-12016-01 Revision J
Function Settings
Summary
ENC
DVB Encoding
mode
SPCTR
NRML
Spectrum Normal or Invert
FLTR
xx %
Nyquist filter
INTRL
x Interleave
Depth
4.4.12.2 QAM Demodulator Status - Receiver BER Screens
Function Settings
Summary
BER Post
0.00E-00
Post-FEC (Forward Error Correction) Bit Error Rate since last “ENTER” reset
BER Pre
0.00E-00
Pre-FEC (Forward Error Correction) Bit Error Rate since last “ENTER” reset
# Bits
0.0000E+00 # of Bits counted since last “ENTER” reset
# Errors
0.0000E+00 # of Errors counted since last “ENTER” reset
Interpreting BER
: BER (Bit-Error-Rate or Bit-Error-Ratio) is a useful measure of reception
quality - analogous to signal-to-noise ratio used in analog systems. It is the ratio of error
bits received to data bits transmitted. This is an averaged value calculated as the total
number of uncorrectable received errors (#Errors) divided by the total number of error-free
received bits (#Bits) from the time the counters were last reset by pressing <ENTER>.
The Post-BER provides the error-ratio after error correction has been applied. This is the
operational error performance of the radio. An error displayed here is one that the audience
may see or hear. Perceptually a listener will not detect single error occurrences at a post
error rate of 1e-10, or about one error per hour. Typically a properly aligned link
should anticipate error free link performance (Post-BER of 0.00E+00) under normal
conditions.
The Pre-BER provides the error-count before error correction has been applied. This
provides a secondary indication for trouble-shooting and alignment purposes. The effects of
various impairments normally repaired by error-correction will be seen here.
NOTE
: Pre-BER may indicate a static (non-zero) error rate under normal operation,
depending on the QAM mode, especially in the higher QAM modes of operation such as 32
QAM and 64 QAM resulting from transmitter power amplifier IMD. This is normal.
Summary of Contents for Starlink SL9003Q
Page 86: ...5 22 Section 5 Module Configuration Moseley SL9003Q 602 12016 01 Revision J ...
Page 90: ...6 4 Section 6 Customer Service Moseley SL9003Q 602 12016 01 Revision J ...
Page 110: ...A 10 Appendix A Path Evaluation Information Moseley SL9003Q 602 12016 01 Revision J ...
Page 118: ...D 2 Appendix D Microvolt dBm Watt Conversion 50 ohms Moseley SL9003Q 602 12016 01 Revision J ...