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Note: System C/N may not be equivalent to down-link C/N. It is not possible for
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Note: System C/N Margin may not be equivalent to down-link C/N Margin. It is not
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EN/LZT 790 0005 R7A
Lock Status – This field indicates if the satellite input option is locked to the
incoming carrier or not.
Signal Level – This field displays the estimated input power of the wanted
carrier.
Error Ratio – This field displays the Error Ratio for the demodulated data. In
DVB-S mode the field displays the post Viterbi error ratio. A level of 2E-4
indicates that the Quasi Error Free point where the signal is deemed to be failing
has been reached. In DVB-S2 mode the field returns the Packet Error ratio. A
level of 1E-7 indicates that the Quasi Error Free point where the signal is
deemed to be failing has been reached.
C/N – This field displays an estimate for the system carrier to noise ratio
(absolute) on the received signal in units of dB.
the IRD to differentiate between the system noise floor and the down-link
noise floor. Most satellite links are designed so that they are down-link
thermal noise (rain fade) dominated. However, some satellite links can also
be affected by system issues such as cross-polar interference, adjacent
channel interference, adjacent satellite interference, cable tilt, etc.
C/N Margin – This field displays an estimate for the system carrier-to-noise
margin to failure for the received signal in units of dB. When the C/N Margin
reads 0 dB the demodulator is likely to be at the Quasi Error Free point and on
the verge of failing.
possible for the IRD to differentiate between the system noise floor and the
down-link noise floor. Most satellite links are designed so that they are
down-link thermal noise (rain fade) dominated. However, some satellite links
can also be affected by system issues such as cross-polar interference,
adjacent channel interference, adjacent satellite interference, cable tilt, etc.
Standard – This field displays the modulation standard for the incoming, locked
signal: DVB-S or DVB-S2.
Modulation – This field displays the modulation type for the incoming, locked
signal: QPSK, 8PSK etc.
FEC – This field displays the FEC for the received signal.
Spectral Sense – This field displays the whether the incoming frequency
spectrum has become inverted due to frequency up or down-conversion
processes in either the up-link or down-link location.
Pilot Symbols – This field indicates if DVB-S2 pilot tones are in use on the
transmitted signal.
Ericsson recommends the use of DVB-S2 pilots for the following modulations:
Using the Equipment
3-75
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