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CDM-750 Advanced High-Speed Trunking Modem
Appendix D
To continue, consider this example:
Satellite & Transponder
Earth Station 1
Earth Station 2
Data Rate
Whereas the original link used 8PSK TPC 3/4, the CnC link used DVB‐S2 8PSK 3/4. The savings
summary is as follows – using CnC and DVB‐S2 reduced the leased bandwidth by almost 50%
and HPA power by almost 60%:
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 8PSK, 1 dB Feed Loss.
IS-901 @ 342º W, 22/22 (EH/EH)
Africa – 9.1 m
Africa – 4.5 m
20.48 Mbps / 20.48 Mbps
Original Link
Hub to
Remote
Total
Remote
To Hub
20.48
20.48
8PSK
8PSK
TPC 3/4
TPC 3/4
13.1
13.1
26.2
10.3
4.9
15.2
-
-
26.2
44
112
D–15
With Carrier-in-Carrier
Hub to
Remote to
Remote
Hub
-
20.48
20.48
-
8PSK
8PSK
-
S2 3/4
S2 3/4
13.2
13.2
6.4
2.0
-
-
27
47
Revision 2
MN-CDM750
Savings
Total
-
-
-
13.2
8.4
13.2
49.6%
38.3%
58.3%
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