Summary Of Specifications; Modulator - Comtech EF Data CDM-570A Installation And Operation Manual

CDM-570A/570AL Satellite Modem with Optional Packet Processor
Introduction
1.3

Summary of Specifications

1.3.1

Modulator

Parameter
Modulation
Symbol Rate Range
Data Rate Range
Operating Modes
FEC
FEC (cont.)
Harmonics and Spurious
Transmit Filtering
Transmit On/Off Ratio
Specification
BPSK, QPSK, OQPSK, 8-PSK, 8-QAM, and 16-QAM
2.4 kbps to 10.239 Mbps
See Section 1.3.6
• Transparent, Closed Network, IESS-315 (VSAT Turbo)
• Open Network, per Intelsat IESS-308/309/310/314 (IDR, IBS/SMS)
• Proprietary EDMAC framed mode:
o 5% overhead – EDMAC (data rates < 2.048 Mbps all modes except BPSK Turbo, Rate 21/44 QPSK
Turbo)
o 1.6% overhead – EDMAC-2 (data rates >2.048 Mbps and all Rate 21/44, 5/16 Turbo)
• R-S Outer Codec
o 220,200 outer code (transparent mode)
o 200,180 outer code (EDMAC modes)
• Turbo Product Codec – 2nd Generation Rates 21/44, 5/16, 21/44, 3/4, 7/8, and 0.95 (optional plug-in
module for rate 0.95)
• VersaFEC Codec (short-block, low latency and ultra-low-latency LDPC)
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• Automatic Uplink Power Control (AUPC) mode
• DoubleTalk Carrier-in-Carrier
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• None: Uncoded BPSK/QPSK/OQPSK
• Viterbi: k=7, per IESS-308/309
o BPSK: Rate 1/2
o QPSK/OQPSK: Rate 1/2, Rate 3/4 and Rate 7/8
o 16-QAM: Rate 3/4 and Rate 7/8 (requires Reed-Solomon)
• Reed-Solomon (Closed Network):
o 220,200 outer code (transparent mode)
o 200,180 outer code (EDMAC modes)
o Interleaver depth = 4
• 8-PSK/TCM Rate 2/3 (Trellis) with concatenated Reed-Solomon:
CLOSED NETWORK - NOT IESS-310 COMPATIBLE
• Turbo Product Codec:
o Rate 5/16 BPSK – 2 dimensional
o Rate 21/44 BPSK – 3 dimensional
o Rate 21/44 QPSK/OQPSK – 3 dimensional
o Rate 3/4 QPSK/OQPSK/8-PSK/8-QAM/16-QAM – 2 dimensional
o Rate 7/8 QPSK/OQPSK/8-PSK/8-QAM/16-QAM – 2 dimensional
o Rate 0.95 (optional plug-in card) QPSK/OQPSK/8-QAM/8-PSK – 2 dimensional eTPC (exact
Code Rate is actually 17/18, or 0.944)
• VersaFEC Codec (FAST Option):
o Rate 0.488 BPSK (also 0.493 BPSK Ultra-Low-Latency
o Rate 0.533, 0.631, 0.706, 0.803 QPSK (0.493, 0.654, 0.734 Ultra-Low-Latency
o Rate 0.642, 0.711, 0.780 8-QAM (also 0.576 8-QAM Extended CCM
o Rate 0.731, 0.780, 0.829, 0.853 16-QAM (also 0.644 16-QAM Extended CCM
-60 dBC/4 kHz from 600 to 2600 MHz (L-Band) and from 1 to 400 MHz (IF)
Per Intelsat IESS-308 (FIR digital filter implementation)
Root-Raised Cosine, alpha = 0.05, 0.10, 0.15, 0.20, 0.25, and 0.35 roll-off
55 dB minimum
mode (optional plug-in module)
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1–14
MN-CDM570A
Revision 3