Comtech EF Data CDM-570 User Manual
Page 17
CDM-570/570L Satellite Modem with Optional IP Module
Revision 12
Table of Contents
MN/CDM570L.IOM
ix
7.3.6
Maint (Maintenance) | Unit Info Page ................................................................................ 7–17
CHAPTER 8.
FORWARD ERROR CORRECTION OPTIONS ............................................. 8–1
8.1
Introduction ................................................................................................................................. 8–1
8.2
Viterbi .......................................................................................................................................... 8–1
8.3
Reed-Solomon Outer Codec (Hardware Option) ..................................................................... 8–2
8.4
Trellis Coding (requires 8-PSK/8-QAM FAST Option) .......................................................... 8–4
8.5
Turbo Product Codec (Hardware Option) ............................................................................... 8–5
8.5.1
Introduction ........................................................................................................................... 8–5
8.5.2
TPC modes available in the CDM-570/570L ........................................................................ 8–5
8.5.3
8-QAM Modulation .............................................................................................................. 8–6
8.5.4
End-to-End Processing Delay ............................................................................................... 8–6
8.5.5
Comparison of all TPC Modes .............................................................................................. 8–7
8.6
Uncoded Operation (No FEC) ................................................................................................... 8–8
8.7
Rates above 2.5 Msymbols/sec ................................................................................................... 8–9
CHAPTER 9.
AUTOMATIC UPLINK POWER CONTROL (AUPC) ..................................... 9–1
9.1
Introduction ................................................................................................................................. 9–1
9.2
Setting AUPC Parameters .......................................................................................................... 9–2
9.2.1
Target E
b
/N
0
.......................................................................................................................... 9–2
9.2.2
Max Range ............................................................................................................................ 9–2
9.2.3
Alarm .................................................................................................................................... 9–2
9.2.4
Demod Unlock ...................................................................................................................... 9–3
9.3
Compensation Rate ..................................................................................................................... 9–3
9.4
Monitoring ................................................................................................................................... 9–3
CHAPTER 10.
CLOCKING MODES .................................................................................... 10–1
10.1
Introduction ............................................................................................................................... 10–1
10.2
Transmit Clocking .................................................................................................................... 10–2
10.2.1
Internal Clock ...................................................................................................................... 10–2
10.2.2
Tx Terrestrial ...................................................................................................................... 10–2
10.2.3
Rx Loop-Timed, Rx=Tx ..................................................................................................... 10–2
10.2.4
Rx Loop-Timed, Rx<>Tx (Asymmetric Loop Timing) ...................................................... 10–2
10.3
Receive Clocking ....................................................................................................................... 10–3
10.3.1
Buffer Disabled (Rx Satellite) ............................................................................................. 10–3