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DTM-3237B – DVB-S2X Receiver with DVB-ASI Output
User Manual
Nr
Variable
0x0B
Interface bitrate
4.5.7 Receiver Statistics
In DVB-S2, the pre-LDPC BER is the bit error rate before the receiver has applied any error correction.
For the DTM-3237B it is be computed from the MER using formulas. These formulas have been
validated using DekTec's advanced demodulator simulation software (this software has been used
amongst others in the DVB working groups for the definition of DVB-T2 and DVB-C2). The
correspondence between theoretical and measured values is very good.
The E
/N
is computed from the MER under the assumption that the noise distribution is Gaussian
s
0
(AWGN channel), as under these circumstances E
from the E
/N
for constant modulated (CCM) streams only.
s
0
Nr
Variable
0x00
All
0x01
RF power-level
0x02
SNR
0x03
MER
0x04
E
/N
s
0
0x05
E
/N
b
0
0x06
Link margin
0x07
BER pre-Viterbi
Manageable Items – Category 0x91 – Receiver status
Detected interface bitrate after FEC
0 = Unknown or receiver not locked
INT_MIN = N/A for ACM streams
Manageable Items – Category 0x92 – Receiver statistics
All settings in this category
RF power-level for channel bandwidth
in 0.1 dBmV units
Signal-over-noise ratio in 0.1 dB units
INT_MIN = Unknown or not locked
Modulation-error-rate in 0.1 dB units
INT_MIN = Unknown or not locked
Energy per symbol per noise power
spectral density in 0.1 dB units
INT_MIN = Unknown or not locked
Energy per bit to noise power spectral
density ratio in 0.1 dB units
INT_MIN = Unknown or not locked
INT_MIN + 1 = N/A for ACM streams
Difference in dB between C/N of the
received signal and the C/N at which
the receiver cannot demodulate the
signal any more in 0.1dB units
INT_MIN = Unknown or not locked
INT_MIN + 1 = N/A for DVB-S2 MIS
Pre-Viterbi bit error rate
INT_MIN = Unknown or not locked
INT_MIN + 1 = N/A for DVB-S2
Description
/N
and MER are identical. The E
s
0
Description
26
Access
Type
RO
uint32
/N
is computed
b
0
Access
Type
RO
76 bytes
RO
int32
RO
int32
RO
int32
RO
int32
RO
int32
RO
int32
RO
uint64
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