Dvb-S2 / S2X - SEFRAM 7849B User Manual

11.11 DVB-S2 / S2X

TUNER
Display of the measures of:

BERi : error rate before LDPC

BERo : error rate after LDPC

PER : error rate after BCH (lost packets)

MER : modulation error rate

LKM : Noise margin (Link Margin)
Recall:
LDPC: Low Density Parity Check
BCH: Bose Chauhuri Houquenohem
The concatenation Viterbi + Reed Solomon of the correction of DVB-S has been replaced by the concatena-
tion LDPC + BCH under DVB-S2.
The standard DVB-S2 has an extension: DVB-S2X with more modulations, roll-off, ... (EN 302307 part 2)
If the option is present, the device will automatically detect this extension.
7849B – 7859B – 7817B
DEMODULATEUR LDPC
BERi
p.
DECODAGE
BCH
MPEG
BERo
PER
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