Dvb-S And Dss - Alcad 918 Serie Manuel D'utilisation

•
PER: error rate 'packets'
Ratio between the number of false packets / number of transmitted packets during the
measurement time
Recall: Under DVB-C, a packet is made of 204 bites; a packet is "false" if it includes more than 8 wrong
octets (correction by Reed Solomon coding).

11.11 DVB-S and DSS

Display of the measures of:
•
BERi : error rate before Viterbi
•
BERo : error rate after Viterbi
•
PER : error rate after Reed Solomon (error rate paquet)
•
MER : modulation error rate
•
LKM : Noise margin (Link Margin)
•
BERx :
Ratio between the number of false bits / number of transmitted bits during the
measurement time
•
PER : error rate 'paquets'
Ratio between the number of false packets / number of transmitted packets during the
measurement time
Recall: Under QPSK (DVB-S) a packet is made of 204 octets; a packet is "false" if it includes more than 8
wrong octets (correction by Reed Solomon coding). Under DSS, a packet is made of 146 octets.
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DEMODULATOR
TUNER
BERi
error rate 'bits'
REED
DECODING
VITERBI
SOLOMON
MPEG
BERo PER