Comtech EF Data CDM-625 - Page 16

CDM-625 Advanced Satellite Modem Revision 13
Table of Contents MN-CDM625
xii
9.3.3 Buffer Enabled, RX<>TX (TX Terrestrial or Int (SCT) Clock) ................................................................... 9–4
9.4 X.21 Notes .......................................................................................................................... 9–6
9.5 Drop and Insert ................................................................................................................... 9–6
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 Introduction ..................................................................................................................... 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 Validating Carrier-in-Carrier Performance ........................................................................................ 10–16
10.5 Operational References ................................................................................................... 10–17
10.5.1 Carrier-in-Carrier Link Budget Calculation ........................................................................................ 10–17
10.5.2 Estimating PSD Ratio ........................................................................................................................... 10–18
10.5.2.1 Estimating PSD Ratio from LST ....................................................................................................... 10–18
10.5.2.2 Estimating PSD Ratio from Satmaster ........................................................................................... 10–19