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FIELD METERS MCT 080 / 081 / 082 / 085 USER MANUAL
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10.12 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
: error rate ‘bits’
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.
Display of the type of
Modulation
detected:
constellation (QPSK)
Viterbi rate (3/4)
TUNER
DEMODULATOR
VITERBI
REED
SOLOMON
DECODING
MPEG
BERi
BERo
PER
Constellation