Comtech EF Data CDM-625 - Manual (Page 14)

CDM-625 Advanced Satellite Modem Revision 15
Table of Contents MN-CDM625
xii
9.6 Frame Formats .................................................................................................................... 9–7
9.7 Timeslot Selection ............................................................................................................... 9–8
9.8 Drop and Insert (D&I) Clocking ............................................................................................ 9–9
9.9 RX Buffer Clock = Insert (D&I only) .................................................................................... 9–10
9.10 Single-Source Multiple Modems ........................................................................................ 9–10
9.11 G.703 Clock Extension ....................................................................................................... 9–11
9.11.1 Clock Extension Mode 1 ......................................................................................................................... 9–11
9.11.2 Clock Extension Mode 2 ......................................................................................................................... 9–12
9.11.3 Clock Extension Mode 3 ......................................................................................................................... 9–12
9.12 Quad E1 Operation ........................................................................................................... 9–16
CHAPTER 10.
DOUBLETALK
CARRIER-IN-CARRIER OPTION ..................................... 10–1
10.1 Overview .......................................................................................................................... 10–1
10.2 What is DoubleTalk Carrier-in-Carrier? .............................................................................. 10–1
10.3 Application Requirements ................................................................................................. 10–2
10.3.1 Operational Recommendations ............................................................................................................ 10–4
10.4 System Functionality and Operational Considerations........................................................ 10–5
10.4.1 DoubleTalk Carrier-in-Carrier Cancellation Process ............................................................................ 10–7
10.4.2 Margin Requirements ............................................................................................................................ 10–9
10.4.3 Carrier-in-Carrier Latency ....................................................................................................................... 10–9
10.4.4 Carrier-in-Carrier and Adaptive Coding and Modulation ................................................................... 10–9
10.4.5 Carrier-in-Carrier Link Design................................................................................................................. 10–9
10.4.5.1 Symmetric Data Rate Link .............................................................................................................. 10–10
10.4.5.2 Asymmetric Data Rate Link ............................................................................................................ 10–12
10.4.5.3 Power Limited Links ........................................................................................................................ 10–13
10.4.6 Carrier-in-Carrier Commissioning and Deployment ........................................................................ 10–15
10.4.7 Validate Carrier-in-Carrier Performance ........................................................................................... 10–16
10.5 Operational References ................................................................................................... 10–17
10.5.1 Calculate Carrier-in-Carrier Link Budget ............................................................................................ 10–17
10.5.2 Methods to Use to Estimate PSD Ratio ............................................................................................. 10–18
10.5.2.1 Use Downlink EIRP and Symbol Rate ............................................................................................ 10–18
10.5.2.2 Use LST .............................................................................................................................................. 10–18
10.5.2.3 Use SatMaster ................................................................................................................................. 10–19
10.5.2.4 Use a Spectrum Analyzer ................................................................................................................ 10–19
10.6 Carrier-in-Carrier Automatic Power Control (CnC-APC) ..................................................... 10–20
10.6.1 About CnC-APC ..................................................................................................................................... 10–20
10.6.2 AUPC and Carrier-in-Carrier in the CDM-625 ................................................................................... 10–20