Comtech EF Data CDM-600/600L User Manual
Page 14
CDM-600/600L Open Network Satellite Modem
Revision 3
Table of Contents
MN/CDM600L.IOM
viii
6.7.1
Introduction ........................................................................................................................... 6–6
6.7.2
LDPC versus TPC ................................................................................................................. 6–7
6.7.3
End-to-End Processing Delay ............................................................................................... 6–8
6.8
Uncoded Operation (No FEC) ................................................................................................. 6–11
CHAPTER 7.
AUTOMATIC UPLINK POWER CONTROL (AUPC) ..................................... 7–1
7.1
Introduction ................................................................................................................................. 7–1
7.2
Setting AUPC Parameters .......................................................................................................... 7–1
7.2.1
AUPC Target E
b
/N
0
............................................................................................................... 7–2
7.2.2
AUPC Max Range ................................................................................................................ 7–2
7.2.3
AUPC Alarm ......................................................................................................................... 7–2
7.2.4
Demod Unlock ...................................................................................................................... 7–3
7.3
Compensation Rate ..................................................................................................................... 7–3
7.4
Monitoring ................................................................................................................................... 7–3
CHAPTER 8.
CLOCKING MODES AND DROP AND INSERT (D&I) ................................... 8–1
8.1
Introduction ................................................................................................................................. 8–1
8.2
Transmit Clocking ...................................................................................................................... 8–1
8.2.1
Internal Clock ........................................................................................................................ 8–1
8.2.2
Tx Terrestrial Clock .............................................................................................................. 8–2
8.2.3
Rx Loop-Timed, Rx=Tx ....................................................................................................... 8–2
8.2.4
Rx Loop-Timed, Rx<>Tx (Asymmetric Loop Timing) ........................................................ 8–2
8.2.5
External Clock ...................................................................................................................... 8–2
8.3
Receive Clocking ......................................................................................................................... 8–3
8.3.1
Buffer Disabled (Rx Satellite) ............................................................................................... 8–3
8.3.2
Buffer Enabled, Tx=Rx (Tx Terrestrial or External Clock) .................................................. 8–3
8.3.3
Buffer Enabled, Rx<>Tx (Tx Terrestrial or External Clock) ............................................... 8–3
8.4
X.21 Notes .................................................................................................................................... 8–3
8.5
Drop and Insert (D&I) with ESC and AUPC ........................................................................... 8–6
8.6
Frame Formats ............................................................................................................................ 8–7
8.7
Time Slot Selection ...................................................................................................................... 8–8
8.8
Drop and Insert (D&I) Clocking ............................................................................................... 8–9
8.9
Rx Buffer Clock = Insert (D&I only) ...................................................................................... 8–10
8.10
Single-Source Multiple Modems .............................................................................................. 8–10