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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 F
Table F-10. Carrier-in-Carrier Link Savings Summary
Original Link
Hub to
Remote
Total
Remote
to Hub
2048
2048
8-PSK
8-PSK
TPC 3/4
TPC 3/4
1.3
1.3
2.2
1.0
5.0
11.6
CDM-425 Advanced Satellite Modem
With Carrier-in-Carrier and VersaFEC
Hub to
Remote to
Remote
Hub
2048
2048
QPSK
QPSK
0.803
0.803
2.6
1.8
1.8
3.2
1.1
0.5
3.2
2.0
4.7
F–16
Revision 0
Savings
Total
1.8
1.6
1.8
44%
60%
60%
MN-CDM-425
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