Comtech EF Data CDM-425 Installation And Operation Manual page 12

E.3 Receive Clocking ........................................................................................................................ E-4
E.3.1 Buffer Disabled (RX Satellite) ................................................................................................... E-4
E.3.2 Buffer Enabled, TX=RX (TX Terrestrial or Int (SCT) Clock) ...................................................... E-4
E.3.3 Buffer Enabled, RX<>TX (TX Terrestrial or Int (SCT) Clock) ................................................... E-4
E.4 X.21 Notes .................................................................................................................................... E-6
E.5 Drop and Insert (D&I) .................................................................................................................. E-6
E.6 Frame Formats ............................................................................................................................ E-7
E.7 Timeslot Selection....................................................................................................................... E-8
E.8 Drop and Insert (D&I) Clocking .................................................................................................. E-9
E.9 RX Buffer Clock = Insert (D&I only) .........................................................................................E-10
E.10 Single-Source Multiple Modems ..............................................................................................E-10
E.11 G.703 Clock Extension .............................................................................................................. E-11
E.11.1 Clock Extension Mode 1 ......................................................................................................... E-11
E.11.2 Clock Extension Mode 2 ......................................................................................................... E-12
E.11.3 Clock Extension Mode 3 ......................................................................................................... E-12
E.12 Quad E1 Operation ....................................................................................................................E-17
APPENDIX F. DOUBLE TALK CARRIER-IN-CARRIER (CNC) OPTION ........................................... F-1
F.1 Overview ...................................................................................................................................... F-1
F.1.1 What is DoubleTalk Carrier-in-Carrier? ..................................................................................... F-1
F.1.2 Application Requirements ......................................................................................................... F-2
F.1.3 Operational Recommendations ................................................................................................ F-4
F.2 System Functionality and Operational Considerations .......................................................... F-4
F.2.1 DoubleTalk Carrier-in-Carrier Cancellation Process ................................................................. F-8
F.2.2 Margin Requirements................................................................................................................ F-9
F.2.4 Carrier-in-Carrier and Adaptive Coding and Modulation......................................................... F-10
F.2.5 Carrier-in-Carrier Link Design ................................................................................................. F-10
F.2.5.1 Symmetric Data Rate Link .......................................................................................... F-10
F.2.5.2 Asymmetric Data Rate Link ......................................................................................... F-13
F.2.5.3 Power Limited Links .................................................................................................... F-15
F.2.6 Carrier-in-Carrier Commissioning and Deployment ................................................................ F-17
F.2.7 Validate Carrier-in-Carrier Performance ................................................................................. F-18
F.3 Operational References ............................................................................................................ F-19
F.3.1 Calculate Carrier-in-Carrier Link Budget................................................................................. F-19
F.3.2 Methods to Estimate PSD Ration ........................................................................................... F-20
F.3.2.1 Use Downlink EIRP and Symbol Rate ........................................................................ F-20
F.3.2.2 Use LST ...................................................................................................................... F-20
F.3.2.3 Use Satmaster ............................................................................................................. F-21
F.4 Carrier-in-Carrier Automatic Power Control (CnC-APC) ....................................................... F-22
F.4.1 Overview ................................................................................................................................. F-22
F.4.2 AUPC and Carrier-in-Carrier ................................................................................................... F-22
F.4.3 The CnC Automatic Power Control Algorithm ......................................................................... F-22
F.4.4 CnC-APC Framing .................................................................................................................. F-25
F.4.4.1 CnC-APC Framing and the Self-Locking Problem ...................................................... F-26
F.4.5 CnC-APC Response Time ...................................................................................................... F-26
F.4.6 CnC-APC Setup ...................................................................................................................... F-27
F.4.7 CnC-APC Redundancy Support Notes ................................................................................... F-31
F.5 DoubleTalk Carrier-in-Carrier Specifications ......................................................................... F-32
F.6 Carrier-in-Carrier Summary ...................................................................................................... F-33
F.7 Glossary ..................................................................................................................................... F-33
APPENDIX G. E /N
B O
G.1 Overview ..................................................................................................................................... G-1
G.1.1 (Co+No)/No Example ............................................................................................................... G-2
Table of Contents
MEASUREMENT ............................................................................................... G-1
CDM-425 Advanced Satellite Modem
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MN-CDM-425