CDM-570A/570AL Satellite Modem with Optional Packet Processor
Revision 5
DoubleTalk Carrier-in-Carrier Option G–20 MN-CDM570A
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
b
/N
O
.
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:
• BW
Duplex Link
= Greater of (BW
Carrier 1
, BW
Carrier 2
)
• PEB
Duplex Link
= PEB
Carrier 1
+ PEB
Carrier 2
• Leased BW
Duplex Link
= Greater of (BW
Duplex Link
, PEB
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.
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