Comtech EF Data CDM-570AL - Page 579

CDM-570A/570AL Satellite Modem with Optional Packet Processor
Revision 5
DoubleTalk Carrier-in-Carrier Option G–13 MN-CDM570A
Link Analysis Description
Multicarrier Transponder Lease
Number of Links: 2
Link 1 Link 2
Modulation QPSK QPSK
Information Rate (kbit/s) 1000.0 1000.0
FEC Code Rate .5330 .5330
R-S Code Rate N/A N/A
Clear Sky Eb/No Available (dB) 4.3 4.1
Number of Assigned Carriers 1 1
Transmit ES Code HUB REMOTE
Transmit ES Size (m) 4.5 3.0
Receive ES Code REMOTE HUB
Receive ES Size (m) 3.0 4.5
Receive ES G/T (dB/K)
21.5
25.3
Total Leased Resource Usage
LST Calculated
(MultiCarrier Transponder Lease)
Total BW Allocated 1.0319 MHz
TotalBW PEB* .9755 MHz
Total EIRP Utilized 12.8 dBw Total BW Utilized 1.0319 MHz
Total EIRP Available 13.3 dBw Total BW Available 1.1000 MHz
Margin (available-utilized) .5 dBw Margin (available-utilized) 0.681 MHz
*PEB = Power Equivalent Bandwidth
CnC Allocated BW = 1.0319 MHz
CnC PEB = 0.9755 MHz
CnC Leased BW = 1.03196 MHz
The link budget summary for the different ModCod combinations is as follows:
S.No. Modulation & FEC (CnC Carrier)
Allocated
BW
(MHz)
PEB
(MHz)
Leased
BW
(MHz)
CnC
Leased
BW
Savings
PSD Ratio
(dB)
1 QPSK, VersaFEC 0.533, 10% ROF 1.0319 0.9755 1.0319 36% 2.2
2 QPSK, VersaFEC 0.631, 15% ROF 0.9113 1.1069 1.1069 31% 2.2
3 QPSK, VersaFEC 0.706, 25% ROF 0.8859 1.3223 1.3223 17% 2.2