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F.3
Operational References
F.3.1
Calculate Carrier-in-Carrier Link Budget
Comtech EF Data recommends that you do these steps to calculate the link budget for a CnC
Link:
Step
1
Calculate the link budget for both carriers in the duplex link, with required CnC margin:
2
Verify that the PDS ration is within spec for the CDM-425 Advanced Satellite Modem.
3
Calculate the Allocated Bandwidth (BW) and Power Equivalent Bandwidth (PEB) for the duplex link:
For an optimal link, the Leased Bandwidth and the Power Equivalent Bandwidth should be equal / nearly
4
equal.
Repeat the link budget process by selecting different Modulation and FEC, until the BW and PEB is
5
nearly balanced.
Appendix F
BW
= Greater of (BW
•
Duplex Link
PEB
= PEB
•
Duplex Link
Carrier 1
Leased BW
= Greater of (BW
•
Duplex Link
Task
, BW
)
Carrier 1
Carrier 2
+ PEB
Carrier 2
, PEB
Duplex Link
Duplex Link
F–19
CDM-425 Advanced Satellite Modem
)
MN-CDM-425
Revision 0
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