Dvb-S And Dss - Triax MCT 080 User Manual

FIELD METERS MCT 080 / 081 / 082 / 085 USER MANUAL

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)

DEMODULATOR
TUNER
BERi
REED
DECODING
VITERBI
SOLOMON
BERo PER
p.
62
MPEG
Constellation