Comtech EF Data SLM-5650A Installation And Operation Manual page 482

Whereas the original link used 8-PSK TPC 3/4, the Carrier-in-Carrier link used QPSK VersaFEC
0.803. The savings summary is as follows:
Item
Data Rate (kbps)
Modulation
FEC
Occupied BW (MHZ)
Power Eq. BW (MHz)
Leased BW (MHz)
Hub HPA (W)
Remote HPA (W)
Note: 1 dB HPA BO for QPSK, 2 dB HPA BO for 8-PSK, 1 dB Feed Loss.
Using Carrier-in-Carrier and VersaFEC reduced the leased bandwidth by almost 44% and HPA
power by 60%.
Appendix H
Original Link
Hub to Remote to
Remote Hub
2048 2048
8-PSK 8-PSK
TPC 3/4 TPC 3/4
1.3 1.3 2.6
2.2 1.0 3.2
3.2
5.0
11.6
G–16
With Carrier-in-Carrier and
VersaFEC
Hub to Remote to
Total
Remote
2048 2048
QPSK QPSK
0.803 0.803
1.8 1.8
1.1 0.5
2.0
4.7
SLM-5650A Satellite Modem
Revision 10
Savings
Total
Hub
1.8
1.6
1.8 44%
60%
60%
MN-SLM-5650A