Operational References; Calculate Carrier-In-Carrier Link Budget - Comtech EF Data CDM-570A Installation And Operation Manual

G.5

Operational References

G.5.1

Calculate Carrier-in-Carrier Link Budget

You must follow these steps to calculate the link budget for a Carrier-in-Carrier Link: E
Step Task
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-570A/AL.
3 Calculate the Allocated Bandwidth (BW) and Power Equivalent Bandwidth (PEB) for the duplex link:
4 For an optimal link, the Leased Bandwidth and the Power Equivalent Bandwidth should be equal / nearly
equal.
5 Repeat the link budget process by selecting different Modulation and FEC, until the BW and PEB is
nearly balanced.
DoubleTalk Carrier-in-Carrier Option
CDM-570A/570AL Satellite Modem with Optional Packet Processor
BW = Greater of (BW
•
Duplex Link
PEB = PEB
•
Duplex Link Carrier 1
Leased BW = Greater of (BW
•
Duplex Link
, BW )
Carrier 1 Carrier 2
+ PEB
Carrier 2
, PEB
Duplex Link Duplex Link
G–20
Revision 5
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MN-CDM570A