Comtech EF Data cdm-570a - Page 18

CDM-570A/570AL Satellite Modem with Optional Packet Processor
Revision 5
Table of Contents xvi MN-CDM570A
F.2.3 RX Loop-Timed, RX=TX .......................................................................................................................... F–2
F.2.4 RX Loop-Timed, RX<>TX (Asymmetric Loop Timing) ........................................................................... F–2
F.3 Receive Clocking ............................................................................................................................ F–4
F.3.1 Buffer Disabled (RX Satellite) ................................................................................................................ F–4
F.3.2 Buffer Enabled, TX=RX ........................................................................................................................... F–4
F.3.3 Buffer Enabled, RX<>TX ......................................................................................................................... F–4
F.4 X.21 Notes ..................................................................................................................................... F–6
F.5 G.703 Clock Extension ................................................................................................................... F–6
F.5.1 Clock Extension Mode 1 ........................................................................................................................ F–7
F.5.2 Clock Extension Mode 2 ........................................................................................................................ F–8
F.5.3 Clock Extension Mode 3 ........................................................................................................................ F–8
APPENDIX G. DOUBLETALK CARRIER-IN-CARRIER OPTION ....................................... G–1
G.1 Overview ...................................................................................................................................... G–1
G.2 What is DoubleTalk Carrier-in-Carrier? ........................................................................................ G–1
G.3 Application Requirements ........................................................................................................... G–2
G.3.1 Operational Recommendations .......................................................................................................... G–4
G.4 System Functionality and Operational Considerations ................................................................ G–5
G.4.1 DoubleTalk Carrier-in-Carrier Cancellation Process ........................................................................... G–8
G.4.2 Margin Requirements ........................................................................................................................... G–9
G.4.4 Carrier-in-Carrier and Adaptive Coding and Modulation................................................................. G–10
G.4.5 Carrier-in-Carrier Link Design ............................................................................................................. G–10
G.4.5.1 Symmetric Data Rate Link .............................................................................................................. G–10
G.4.5.2 Asymmetric Data Rate Link ............................................................................................................ G–14
G.4.5.3 Power Limited Links ....................................................................................................................... G–15
G.4.5.4 Commission and Deploy Carrier-in-Carrier ................................................................................... G–17
G.4.6 Validate Carrier-in-Carrier Performance ........................................................................................... G–18
G.5 Operational References ............................................................................................................. G–20
G.5.1 Calculate Carrier-in-Carrier Link Budget ............................................................................................ G–20
G.5.2 Estimate PSD Ratio .............................................................................................................................. G–21
G.5.2.1 Estimate PSD Ratio from LST ......................................................................................................... G–21
G.5.2.2 Estimate PSD Ratio from Satmaster .............................................................................................. G–22
G.6 Carrier-in-Carrier Automatic Power Control (CnC-APC) ............................................................ G–23
G.6.1 Overview .............................................................................................................................................. G–23
G.6.2 AUPC and Carrier-in-Carrier in the CDM-570A/AL ........................................................................... G–23
G.6.3 The CnC Automatic Power Control Algorithm .................................................................................. G–23
G.6.4 CnC-APC Framing ................................................................................................................................ G–26
G.6.5 Solving the Problem of Self-Locking .................................................................................................. G–26
G.6.6 CnC-APC Response Time .................................................................................................................... G–27