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USER’S MANUAL. PROLINK-4C
Page 6
02/2003
LEVEL RANGE
COFDM:
45 dBµV to 100 dBµV.
QAM:
45 dBµV to 110 dBµV.
QPSK:
44 dBµV to 114 dBµV.
IMPEDANCE
75
Ω
MEASUREMENTS
COFDM:
Parameters:
BER after Viterbi.
CSI (Channel Status Information). Qualitative
measurement about channel quality. Measures
from 0 to 100 %. 0 % value corresponds to
maximum quality.
Presentation:
Numeric and level bar.
QAM:
Parameters:
BER before FEC (Forward Error Correction).
MER (Modulation Error Ratio).
Presentation:
Numeric and level bar.
QPSK:
Parameters:
BER before Viterbi.
BER after Viterbi.
Presentation:
Numeric and level bar.
WRONG PACKETS
Number of non-correctable packets accumulated
during the measurement time, and indicates when
the fault was produced.
Identification according to levels 1.1, 1.2, 1.3 and
2.1 of TR 101 290 ETSI standard.
DCI FUNCTION
DVB channel identifier. Provides information on the
channel whose BER is being measured.
COFDM SIGNAL PARAMETERS
Carriers
2k / 8k (Selected by the user).
Guard Interval
1/4, 1/8, 1/16, 1/32 (Selected by the user).
Code Rate
1/2, 2/3, 3/4, 5/6, 7/8.
Modulation
QPSK, 16-QAM, 64-QAM.
Spectral inversion
Selectable: ON, OFF.
Hierarchy
Indicates hierarchy mode.
FEC
Reed-Solomon (204, 188) and Viterbi.
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