Comtech EF Data CDM-625A Installation And Operation Manual page 20

CDM-625A Advanced Satellite Modem
Table of Contents
F.4 System Functionality and Operational Considerations.......................................................... F–5
F.4.1 DoubleTalk Carrier-in-Carrier Cancellation Process .............................................................................. F–7
F.4.2 Margin Requirements .............................................................................................................................. F–9
F.4.4 Carrier-in-Carrier and Adaptive Coding and Modulation ..................................................................... F–9
F.4.5 Carrier-in-Carrier Link Design................................................................................................................... F–9
F.4.5.1 Symmetric Data Rate Link ................................................................................................................. F–10
F.4.5.2 Asymmetric Data Rate Link ............................................................................................................... F–12
F.4.5.3 Power Limited Links ........................................................................................................................... F–13
F.4.5.4 Carrier-in-Carrier Commissioning and Deployment ....................................................................... F–15
F.4.6 Validating Carrier-in-Carrier Performance ........................................................................................... F–16
F.5 Operational References ..................................................................................................... F–17
F.5.1 Carrier-in-Carrier Link Budget Calculation ........................................................................................... F–17
F.5.2 Estimating PSD Ratio .............................................................................................................................. F–18
F.5.2.1 Estimating PSD Ratio from LST .......................................................................................................... F–18
F.5.2.2 Estimating PSD Ratio from Satmaster .............................................................................................. F–19
F.6 Carrier-in-Carrier Automatic Power Control (CnC-APC) ....................................................... F–20
F.6.1 Introduction ............................................................................................................................................. F–20
F.6.2 AUPC and Carrier-in-Carrier in the CDM-625A .................................................................................... F–20
F.6.3 The CnC Automatic Power Control Algorithm ..................................................................................... F–20
F.6.4 CnC-APC Framing .................................................................................................................................... F–23
F.6.5 Solving the Problem of Self-Locking...................................................................................................... F–24
F.6.6 CnC-APC Response Time ........................................................................................................................ F–24
F.6.7 CnC-APC Setup ........................................................................................................................................ F–24
F.6.8 CnC-APC Redundancy Support Notes .................................................................................................. F–28
F.7 DoubleTalk Carrier-in-Carrier Specifications ....................................................................... F–29
F.8 Carrier-in-Carrier Summary ............................................................................................... F–30
F.9 Glossary............................................................................................................................ F–30
APPENDIX G. E /N
B
APPENDIX H. EDMAC CHANNEL .................................................................................... H–1
H.1 Theory of Operation ........................................................................................................... H–1
H.1.1 EDMAC ...................................................................................................................................................... H–1
H.1.2 Drop & Insert ++ ....................................................................................................................................... H–2
H.1.3 EDMAC-3 ................................................................................................................................................... H–2
H.2 M&C Connection ................................................................................................................ H–2
H.3 Setup Summary ................................................................................................................. H–4
MEASUREMENT .............................................................................. G–1
O
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MN-CDM625A