STM SatLink VSAT - Page 65

SatLink VSAT User Guide
Publication no. 101557
Rev 14.1.1-2
Copyright 2006-2012 – STM Group, Inc.
Page 64 (182)
Mode
Modulation
FEC Code
Rate
STM
Recommended
SNR (E
s
/N
o
)
DVB-S2
QPSK
1/4
-0.3 dB
DVB-S2
QPSK
1/3
-0.1 dB
DVB-S2
QPSK
2/5
0.2 dB
DVB-S2
QPSK
1/2
1.2 dB
DVB-S2
QPSK
3/5
2.4 dB
DVB-S2
QPSK
2/3
3.2 dB
DVB-S2
QPSK
3/4
4.2 dB
DVB-S2
QPSK
4/5
4.9 dB
DVB-S2
QPSK
5/6
5.4 dB
DVB-S2
QPSK
8/9
6.4 dB
DVB-S2
QPSK
9/10
6.7 dB
DVB-S2
8PSK
3/5
6.0 dB
DVB-S2
8PSK
2/3
7.0 dB
DVB-S2
8PSK
3/4
8.4 dB
DVB-S2
8PSK
5/6
9.8 dB
DVB-S2
8PSK
8/9
11.2 dB
DVB-S2
8PSK
9/10
11.6 dB
DVB-S2
16APSK
2/3
10.0 dB
DVB-S2
16APSK
3/4
11.2 dB
DVB-S2
16APSK
4/5
12.0 dB
DVB-S2
16APSK
5/6
12.6 dB
DVB-S2
16APSK
8/9
13.9 dB
DVB-S2
16APSK
9/10
14.1 dB
Table 12: Required Forward Link SNR values for DVB-S2 Mode
For DVB-S operation:
The minimum SNR value is specified in Table 13 below. However, this table does not account for any
required link margin to compensate rain fade attenuation.
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
1.5 dB
DVB-S
QPSK
2/3
3.2 dB
DVB-S
QPSK
3/4
4.3 dB
DVB-S
QPSK
5/6
5.2 dB
DVB-S
QPSK
7/8
6.1 dB
Table 13: 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 SatLink 4033/4035
transceiver. See Appendix I for a description of how to perform 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.