Comtech EF Data CDM-570A - Manual (Page 48)

CDM-570A/570AL Satellite Modem with Optional Packet Processor MN-CDM570A
Introduction Revision 2
1–14
1.3 Summary of Specifications
1.3.1 Modulator
Parameter Specification
Modulation BPSK, QPSK, OQPSK, 8-PSK, 8-QAM, and 16-QAM
Symbol Rate Range 2.4 kbps to 10.239 Mbps
Data Rate Range See Section 1.3.6
Operating Modes • 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)
• Automatic Uplink Power Control (AUPC) mode
• DoubleTalk ® Carrier-in-Carrier ® mode (optional plug-in module)
FEC
FEC (cont.)
• 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
Harmonics and Spurious -60 dBC/4 kHz from 600 to 2600 MHz (L-Band) and from 1 to 400 MHz (IF)
Transmit Filtering 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
Transmit On/Off Ratio 55 dB minimum