Comtech EF Data SLM-5650A - 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.