Comtech EF Data CDM-600/600L User Manual
Page 47
CDM-600/600L Open Network Satellite Modem
Revision 3
Introduction
MN/CDM600L.IOM
1–19
FEC None
: Uncoded BPSK/QPSK/OQPSK
Viterbi:
k=7, per IESS-308/309
BPSK: Rate 1/2
QPSK/OQPSK: Rate 1/2, Rate 3/4 and Rate 7/8
16-QAM: Rate 3/4 and Rate 7/8 (Viterbi plus Reed-Solomon only)
Sequential:
k=36 (Rate 1/2) per IESS-309
k= 63 (Rate 3/4) per IESS-309
k= 87 (Rate 7/8)
Important note: Sequential decoding limits the data rate to a maximum of 2.048 Mbps for OQPSK
and 1.024 Mbps for BPSK.
Reed-Solomon (Open Network):
IDR modes:
225/205 for T1
219/201 for E1 and IESS-310 mode,
194/178 for T2 and E2
IBS modes:
126/112
219/201 for IESS-310 mode
Reed-Solomon (Closed Network):
• 220,200 outer code (transparent mode)
• 225,205 outer code (transparent mode, EF Data compatible, V.35 scrambling)
• 126,112 outer code (transparent mode, IBS parameters, D&I++ mode)
• 219,201 outer code (transparent mode, IESS-310 parameters)
• 200,180 outer code (EDMAC modes)
• Interleaver depth = 4 or 8 (Viterbi, depending on mode)
• Interleaver depth = 8 (Sequential)
8-PSK/TCM Rate 2/3 (Trellis): Per IESS-310
Turbo Product Codec, Low Rate
(1
st
Generation)
(Optional plug-in card):
• Rate 3/4 QPSK/OQPSK/8-PSK/16-QAM - 2 dimensional
• Rate 21/44 BPSK - 3 dimensional
• Rate 5/16 BPSK - 3 dimensional
Turbo Product Codec, High Rate
(2
nd
Generation)
(Optional plug-in card):
• Rate 5/16 BPSK - 2 dimensional
• Rate 21/44 BPSK - 3 dimensional
• Rate 1/2 QPSK/OQPSK - 3 dimensional (exact Code Rate is actually 0.477)
• Rate 3/4 QPSK/OQPSK/8-PSK/16-QAM - 2 dimensional
• Rate 7/8 QPSK/OQPSK/8-PSK/16-QAM - 2 dimensional
• Rate 0.95 QPSK/OQPSK/8-PSK - 2 dimensional TPC (exact Code Rate is actually 0.944)
Low Density Parity Check (LDPC) Codec (Optional plug-in card):
• Rate 1/2 BPSK/QPSK/OQPSK
• Rate 2/3 QPSK/OQPSK/8-PSK/8-QAM
• Rate 3/4 QPSK/OQPSK/8-PSK/8-QAM/16-QAM
Output power
CDM-600L:
0 to -40 dBm, 0.1 dB steps – manual mode.
CDM-600:
0 to -20 dBm, 0.1 dB steps – manual mode.
See Chapter 7. Automatic Uplink Power Control (AUPC).
Power accuracy
CDM-600L:
±1.5 dB over frequency and temperature
CDM-600:
±0.5 dB over frequency and temperature
Output connector
CDM-600L:
Type N Female, 50
Ω
CDM-600:
BNC female
Output frequency
CDM-600L:
950-1950 MHz, 100 Hz resolution
Stability ± 0.02 ppm, 0 to 50
o
C (32
o
to 122
o
F) (standard high-stability internal reference)
Stability ± 1 ppm, 0 to 50
o
C (32
o
to 122
o
F) (optional low-stability internal reference)
CDM-600:
52-88 MHz, 104-176 MHz, 100 Hz resolution – units manufactured prior to February 2005
CDM-600(E):
50-90 MHz, 100-180 MHz, 100 Hz resolution – units manufactured after February 2005
Stability ±1.5 ppm, 0 to 50
o
C (32 to 122
o
F) (standard stability nternal reference)
Stability ±0.02 ppm, 0 to 50
o
C (32 to 122
o
F) (optional high-stability internal reference)
Harmonics
and spurious
CDM-600L
: Better than -55 dBC/4 kHz (typically <-60 dBC/4kHz) – measured from 50 to 2500 MHz
CDM-600:
Better than -55 dBC/4 kHz (typically <-60 dBC/4 kHz) – measured from 25 MHz to 2 GHz