Comtech EF Data CDM-Qx Installation And Operation Manual page 12

CDM-Qx/QxL Multi-Channel Satellite Modem with DoubleTalk™ Carrier-in-Carrier®
Table of Contents
9.1 What is DoubleTalk Carrier-in-Carrier? ................................................................... 9-1
9.2 Application Requirements............................................................................................ 9-1
9.3 System Functionality .................................................................................................... 9-2
9.4 CnC Performance Characterization ........................................................................... 9-4
9.4.1 Degradation Due To Carrier Spacing ......................................................................... 9-4
9.4.2 Selecting The Adjacent Carrier Curve ........................................................................ 9-7
9.4.3 Carrier-in-Carrier
9.4.4 Symbol Rate Ratio ...................................................................................................... 9-9
9.4.5 CnC Carrier Offset .................................................................................................... 9-10
st
9.4.6 1 CnC Example: Adjacent Carriers, CnC Ratio and Rain Fade .............................. 9-10
nd
9.4.7 2 CnC Example: CnC Ratio With Asymmetric Links ........................................... 9-12
rd
9.4.8 3 CnC Example: Asymmetric Link With Rain Fade .............................................. 9-13
CHAPTER 10. EDMAC CHANNEL ........................................................................ 10-1
10.1 Theory Of Operation .................................................................................................. 10-1
10.2 M&C Connection ........................................................................................................ 10-2
10.3 Setup Summary ........................................................................................................... 10-3
CHAPTER 11. REDUNDANCY .............................................................................. 11-1
APPENDIX A. CABLE DRAWINGS ......................................................................... A-1
A.1 Introduction ................................................................................................................... A-1
A.1.1 EIA-530 to RS-422/449 Data Cable ....................................................................... A-2
A.1.2 EIA-530 to V.35 Data Cable ................................................................................... A-3
A.1.3 EIA-530 Conversion Cable ..................................................................................... A-4
A.1.4 Switch Programming Cable .................................................................................... A-5
APPENDIX B. FAST ACTIVATION PROCEDURE ................................................. B-1
B.1 Introduction ................................................................................................................... B-1
B.2 Activation Procedure .................................................................................................... B-1
B.2.1 Obtain Serial Numbers ............................................................................................ B-1
B.2.2 View Currently Installed FAST Features ............................................................... B-3
B.2.2.1 View Base Unit FAST Features .......................................................................... B-3
B.2.2.2 View Installed Module (Mod/Demod, Turbo) FAST Features .......................... B-4
B.2.3 Acquire FAST Code ............................................................................................... B-5
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Ratio (CnC Ratio) ........................................................................ 9-8
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MN/CDMQX.IOM