Comtech EF Data CDM-625 Installation And Operation Manual page 13

CDM-625 Advanced Satellite Modem
Table of Contents
8.3 Compensation Rate ..................................................................................................................... 8-3
8.4 Monitoring ................................................................................................................................... 8-4
CHAPTER 9. CLOCK MODES AND DROP AND INSERT (D&I) ........................................ 9-1
9.1 Introduction ................................................................................................................................. 9-1
9.2 Transmit Clocking ...................................................................................................................... 9-1
9.2.1 Internal Clock ........................................................................................................................ 9-1
9.2.2 Tx Terrestrial ........................................................................................................................ 9-2
9.2.3 Rx Loop-Timed, RX=TX ...................................................................................................... 9-2
9.2.4 Rx Loop-Timed, RX<>TX (Asymmetric Loop Timing) ...................................................... 9-2
9.2.5 External TT with ST = Rx Satellite ...................................................................................... 9-2
9.3 Receive Clocking ......................................................................................................................... 9-3
9.3.1 Buffer Disabled (RX Satellite) .............................................................................................. 9-3
9.3.2 Buffer Enabled, TX=RX (TX Terrestrial or Int (SCT) Clock) ............................................. 9-3
9.3.3 Buffer Enabled, RX<>TX (TX Terrestrial or Int (SCT) Clock ) .......................................... 9-3
9.4 X.21 Notes .................................................................................................................................... 9-3
9.5 Drop and Insert ........................................................................................................................... 9-6
9.6 Frame Formats ............................................................................................................................ 9-6
9.7 Time Slot Selection ...................................................................................................................... 9-7
9.8 Drop and Insert (D&I) Clocking ............................................................................................... 9-8
9.9 Rx Buffer Clock = Insert (D&I only) ........................................................................................ 9-8
9.10 Single-Source Multiple Modems ................................................................................................ 9-9
9.11 G.703 Clock Extension .............................................................................................................. 9-10
9.11.1 Clock Extension Mode 1 ..................................................................................................... 9-10
9.11.2 Clock Extension Mode 2 ..................................................................................................... 9-11
9.11.3 Clock Extension Mode 3 ..................................................................................................... 9-11
CHAPTER 10. DOUBLETALK
10.1 What is DoubleTalk
10.2 System Functionality ................................................................................................................ 10-1
10.3 Application Requirements ........................................................................................................ 10-3
10.4 Symbol Rate and DoubleTalk
10.5 CnC Carrier Frequency Offset ................................................................................................ 10-7
®
CARRIER-IN-CARRIER
® ®
Carrier-in-Carrier
®
Carrier-in-Carrier
MN-0000036 (Ref MN/CDM625.IOM)
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OPTION .................................. 10-1
? ........................................................................... 10-1
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Ratio ................................................... 10-5
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