64APSK, 128APSK and 256APSK MODCODs for iDirect networks.
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Jun 30th, 2022 at 9:09pm
Network users of ST Engineering iDirect now have the opportunity to upgrade their Evolution® networks.
Using Universal Line Cards and new network software enables you to take full advantage of DVB-S2X efficiencies which include Adaptive Coding and Modulation (ACM) and up to 119 Msps in DVB-S2X forward carriers.
When you have high C/N, higher order MODCODs should be investigated, allowing 64APSK, 128APSK and 256APSK. These higher order modulation methods, combined with suitable FEC rates, substantially increase your bit rate for a given satellite transponder bandwidth. Since the system is adaptive this means that instead of having wastefully large C/N rain margins in clear sky you can increase the bit rate during clear sky. This also applies if you have transitioned to a more powerful EIRP satellite.
BPSK gives 1 transmission rate bit per symbol QPSK gives 2 transmission rate bits per symbol 8APSK gives 3 transmission rate bits per symbol 16APSK gives 4 transmission rate bits per symbol 32APSK gives 5 transmission rate bits per symbol 64APSK gives 6 transmission rate bits per symbol 128APSK gives 7 transmission rate bits per symbol 256APSK gives 8 transmission rate bits per symbol
With iDirect sharper roll off filtering your symbol rate increases towards the leased transponder bandwidth.
Your information bit rate is transmission bit rate x FEC ratio.
Contact you iDirect sales representative for more details.
