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

1.3

Summary of Specifications

1.3.1

Modulator

Parameter
Modulation
Symbol Rate Range
Data Rate Range
Operating Modes
FEC
Introduction
CDM-570A/570AL Satellite Modem with Optional Packet Processor
Specification
BPSK, QPSK, OQPSK, 8-PSK, 8-QAM, and 16-QAM
4.8 ksps to 3000 ksps
See Section 1.3.6
• Transparent, Closed Network, IESS-315 (VSAT Turbo)
• 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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• VersaFEC-2 Codec (optional plug-in module, long-block, short-block)
• VersaFEC-2 Adaptive Coding and Modulation – IP interface only – maximum symbol rate = 3.0 Msps
• 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
• VersaFEC-2 Long-Block Codec (Optional plug-in card – low latency LDPC):
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o Rate 0.489 BPSK
o Rate 0.489, 0.537, 0.586, 0.611, 0.635, 0.660, 0.684, 0.733 QPSK
o Rate 0.521, 0.537, 0.562, 0.586, 0.611, 0.635, 0.660, 0.684, 0.708, 0.733 8-ARY
o Rate 0.586, 0.611, 0.635, 0.660, 0.684, 0.708, 0.733, 0.757, 0.782 16-ARY
o Rate 0.660, 0.684, 0.708, 0.733, 0.757, 0.782, 0.801, 0.831, 0.855, 0.879 32-ARY
mode (optional plug-in module)
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1–15
Revision 5
MN-CDM570A