Quantum and Evolution Series Installation and Operating Handbook
7-50
operation, serial interface operation, etc., bringing the full efficiency
benefits of DVB-S2 to all terrestrial data types, not just packet based
interfaces.
Once
SmartLink
has been selected, various other DVB-S2 configuration
menu options become available, including choice of modulation and FEC
rate, as well as DVB-S2 FEC frame size choice and DVB-S2 pilots.
FastLink
Requires one or more of the
FastLink
data rate SAFs. This enables
Paradise’s
FastLink
low-latency LDPC.
FastLink
gives BER performance
approaching that of conventional LDPC but with latency nearer to that of
TPC. In addition,
FastLink
supports modes that optimize either BER
performance or latency even further, giving the flexibility to match FEC
performance more closely to the constraints of the satellite application. In
many, if not all applications,
FastLink
should be able to replace TPC or
conventional LDPC. Note that
FastLink
does not suffer from the error floor
‘flaring’ problem of earlier generation LDPC FECs and consequently does
not require the use of any outer codec to enhance performance.
DIrectIQ
This is a specialized mode that bypasses the normal Tx processing chain
in the modem. It is a mode that Paradise has introduced for specific users
and it has no general, wider application and therefore should not be used.
Factory
default:
Viterbi
Description:
Controls the inner FEC mode.
Edit-Tx-FEC-Inner-Rate Screen
Options:
1/4
DVB-S2/
SmartLink
only.
0.312(5/16)
TPC only.
FEC code rate:
[.75(3/4) de facto ]
New: .75(3/4) de facto
