CDM-625 Advanced Satellite Modem
Revision 1
Table of Contents
MN-0000036 (Ref MN/CDM625.IOM)
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
®
CARRIER-IN-CARRIER
®
OPTION .................................. 10–1
10.1
What is DoubleTalk
®
Carrier-in-Carrier
®
? ........................................................................... 10–1
10.2
System Functionality ................................................................................................................ 10–1
10.3
Application Requirements ........................................................................................................ 10–3
10.4
Symbol Rate and DoubleTalk
®
Carrier-in-Carrier
®
Ratio ................................................... 10–5
10.5
CnC Carrier Frequency Offset ................................................................................................ 10–7
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