7882DM2-LB4-CA2-ASI Series
Satellite DVB-S/S2/S2X Demodulator
Revision 1.0
Page - 15
Frequency
Search Range (kHz):
This field enables the user to set the maximum frequency offset
which is covered by the carrier search (in kHz). The default value for search range is 5000 kHz.
Standard:
Using the drop down menu, select the Modulation standard type (DVB-S or DVB-S2).
NOTE: Satellite frequency, LNB Frequency, Symbol Rate and Standard are mandatory
fields to get a Lock ON, other parameters below are auto-detected by the demod chip.
Modulation:
Using the drop down menu, select the Modulation type (QPSK, 8PSK, 16APSK, 32APSK
or default to Auto).
Pilot:
This parameter allows the user to turn ON or OFF the pilots, user can also set it to Auto mode.
EsNo Margin Threshold:
This field enables the user to set the EsNo Margin Threshold and get the
trap when real EsNo ratio is less than the threshold value. The range for EsNo threshold is 0.0 to 10.0
dB.
Lock Status:
This field allows the user to monitor the demodulator lock status (Idle or Locked).
Standard:
This field allows the user to monitor the Standard of locked channel ( DVB-S/ DVB-S2)
Modulation and FEC:
This field allows the user to monitor the Modulation parameters and FEC for
locked channel.
L-Band Frequency:
This field displays the Lband frequency calculated from the difference between the
RF frequency and the LNB frequency.
Bit Error Rate:
This field displays the demodulator Bit error rate.
Es/No ratio:
This field displays the ratio between the average energy per transmitted symbol and single
sided noise power spectral density. For a summary of performance requirements at QEF over AWGN,
please refer to Section 10 of this manual for minimum EsNo ratio required for any given modulation
schemes and FEC.
Es/No Margin:
This field displays EsNo Margin in dB which indicate how much dB left before losing the
lock.
RF Power:
This field measures the input power level of the locked channel.
Multiple Stream:
This field indicates whether the input RF signal has single stream or multiple streams.
ISI Minimum:
This field indicates the minimum ISI present in the list, if using a multiple stream input.
ISI Maximum:
This field indicates the maximum ISI present in the list, if using a multiple stream input.
ISI Select Status:
This field indicates the current selected ISI from the list, if using a multiple stream
input.
4.1.2. LNB
The user can set the LNB controls for individual input ports by switching between tabs LNB 1, LNB 2,
LNB 3 and LNB 4.
LNB Power:
This field allows the user to enable/disable the LNB power on the input. Using drop-down
menu, it can be set to 13V, 18V or OFF.
