STM SatLink 2000 - Page 54

SatLink VSAT User Guide
Publication no. 101557
Copyright © 2009 – STM Group, Inc.
Page 53 (160)
Mode Modulation FEC Code
Rate
STM
Recommended
SNR (E
s
/N
o
)
DVB-S2 QPSK 1/2 4.2 dB
DVB-S2 QPSK 3/5 5.4 dB
DVB-S2 QPSK 2/3 6.2 dB
DVB-S2 QPSK 3/4 7.2 dB
DVB-S2 QPSK 4/5 7.9 dB
DVB-S2 QPSK 5/6 8.4 dB
DVB-S2 QPSK 8/9 9.4 dB
DVB-S2 QPSK 9/10 9.7 dB
DVB-S2 8PSK 3/5 9.0 dB
DVB-S2 8PSK 2/3 10.0 dB
DVB-S2 8PSK 3/4 11.4 dB
DVB-S2 8PSK 5/6 12.8 dB
DVB-S2 8PSK 8/9 14.2 dB
DVB-S2 8PSK 9/10 14.6 dB
DVB-S2 16APSK 2/3 13.3 dB
DVB-S2 16APSK 3/4 14.5 dB
DVB-S2 16APSK 4/5 15.3 dB
DVB-S2 16APSK 5/6 15.9 dB
DVB-S2 16APSK 8/9 17.2 dB
DVB-S2 16APSK 9/10 17.4 dB
Table 6: Required forward link SNR values for DVB-S2 Mode which apply only if the MAX
MODCOD SNR Threshold value is not displayed when executing the dvb rx show command
For DVB-S operation:
The minimum SNR value is specified in Table 7 below.
Mode Modulation FEC Code
Rate
Required forward link SNR (Ebc/No)) for
achieving less than one error event per hour
DVB-S QPSK 1/2 4.5 dB
DVB-S QPSK 2/3 6.2 dB
DVB-S QPSK 3/4 7.3 dB
DVB-S QPSK 5/6 8.2 dB
DVB-S QPSK 7/8 9.1 dB
Table 7: Required forward link SNR values for DVB-S Mode
9.3.2 TX power calibration
This section describes how to calibrate the TX output power when using the STM SatLink 4033/4035
transceiver. See Appendix I for a description of how to do TX power calibration for other transmitters
(BUCs).
TX power level calibration and return link acquisition shall only be performed if the forward link has
been acquired and is operating properly.