Newtec EL170 - Page 199

Appendix D – Normal and Short
Frames and Mixing Frames
User Manual for EL170/970/470 IP Satellite Modulator/
Demodulator/Modem
version 4.2
198
SHAPING THE FUTURE OF SATELLITE COMMUNICATIONS
Max
Symbol
Rate
(Mbaud)
Normal Frames Short Frames Mix Normal Frames with
< 10 No limitations No limitations No limitations
< 15 No limitations No limitations QPSK or 8PSK short frames
< 20 No limitations No limitations QPSK short frames
< 33 No limitations No Limitations Not possible
< 45 32APSK is not possible! 32APSK is not
possible!
Not possible
Conclusion
As a general rule, we can say that it is recommended to use normal frames. Short
frames however are useful when working with low symbol rates or with latency
sensitive applications.
Mixing normal frames and short frames is an exception on the two general rules,
so it is not recommended to be used.