Technical Description &
Configuration Guide
Status
Window
LigoWave
Page 34
Consume power
– shows the amount of power consumed by PSU in watts (command line -
diagnostics
).
Tx polarization
–
shows transmission polarization and position of connectors and wires at the local
side (command line -
diagnostics
).
Radial MSE
Radial MSE
is a method for estimating the signal to noise ratio. ACM engine uses normalized MSE,
which is the inverse of SNR. It is calculated by dividing the estimated MSE level with the energy of the
received constellation. Radial MSE peak value threshold is dependent on modulation used and LDPC
code rate.
If the Radial MSE value trespasses following thresholds, BER at the output of LDPC decoder will reach
the value of 1.0
10
-6
:
QPSK
16APSK
32APSK
Standard
-8 dB
-13 dB
-15.5 dB
Wide
-10.5 dB
-18 dB
-21.5 dB
LDPC
The
LDPC
is monitored for the number of errors being corrected on the input of LDPC decoder (see
figure below).
Figure 24
– LDPC decoder structure
LDPC stress value thresholds @ BER 1.0
10
-6
:
for standard settings ~ 4.0
10
-2
;
for "wide" option ~ 1.0
10
-3
As long as LDPC stress value is under the specified thresholds, the amount
of errors (and BER itself)
on the output of LDPC remains at zero level.
