Comtech EF Data CDM-625A - Page 24

CDM-625A Advanced Satellite Modem MN-CDM625A / CD-MN-CDM625A
Table of Contents Revision 4
xviii
E.5 Drop and Insert ................................................................................................................... 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–16
APPENDIX F. DOUBLETALK CARRIER-IN-CARRIER 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–5
F.2.1 DoubleTalk Carrier-in-Carrier Cancellation Process .............................................................................. F–7
F.2.2 Margin Requirements .............................................................................................................................. F–9
F.2.4 Carrier-in-Carrier and Adaptive Coding and Modulation ..................................................................... F–9
F.2.5 Carrier-in-Carrier Link Design................................................................................................................... F–9
F.2.5.1 Symmetric Data Rate Link ................................................................................................................. F–10
F.2.5.2 Asymmetric Data Rate Link ............................................................................................................... F–12
F.2.5.3 Power Limited Links ........................................................................................................................... F–13
F.2.6 Carrier-in-Carrier Commissioning and Deployment ........................................................................... F–15
F.2.7 Validate Carrier-in-Carrier Performance .............................................................................................. F–16
F.3 Operational References .....................................................................................................
F–17
F.3.1 Calculate Carrier-in-Carrier Link Budget ............................................................................................... F–17
F.3.2 Methods to Estimate PSD Ration .......................................................................................................... F–18
F.3.2.1 Use Downlink EIRP and Symbol Rate ............................................................................................... F–18
F.3.2.2 Use LST ................................................................................................................................................. F–18
F.3.2.3 Use Satmaster ..................................................................................................................................... F–19
F.4 Carrier-in-Carrier Automatic Power Control (CnC-APC) ....................................................... F–20
F.4.1 Overview .................................................................................................................................................. F–20
F.4.2 AUPC and Carrier-in-Carrier in the CDM-625A .................................................................................... F–20
F.4.3 The CnC Automatic Power Control Algorithm ..................................................................................... F–20
F.4.4 CnC-APC Framing .................................................................................................................................... F–23