Comtech EF Data SLM-5650A User Manual
Page 315
SLM5650A_CDM625 Satellite Modem
Revision 8
DoubleTalk
Carrier-in-Carrier Option
MN-SLM5650A
15–17
15.5 Operational References
15.5.1 Carrier-in-Carrier Link Budget Calculation
The following procedure is required for calculating the link budget for a Carrier-in-Carrier Link:
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 SLM-5650A.
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.