Comtech EF Data CDD-562AL - Manual (Page 32)

CDD-562AL/564A/L Multi-Channel Demodulator Revision 0
Introduction MN-CDD562AL/564AL
1–14
Option Description and Comments
Installation
Method
VFS ViperSat File Streamer FAST
1.4 Summary of Specifications
1.4.1 Demodulator
Parameters Specifications
Modulation BPSK, QPSK, 8-PSK, 8-QAM and 16-QAM
Symbol Rate Range 16Ksps to 3.0 Msps
Data Rate Range 16 kbps to 10.239 Mbps
Operating Modes • Turbo Product Codec – 2nd Generation Rates 21/44, 5/16, 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)
FEC None: Uncoded BPSK/QPSK
Turbo Product Codec, 4-bit soft-decision:
Rate 5/16 BPSK – 2 dimensional
Rate 21/44 BPSK – 3 dimensional
Rate 21/44 QPSK – 3 dimensional
Rate 3/4 QPSK/8-PSK/8-QAM/16-QAM – 2 dimensional
Rate 7/8 QPSK/8-PSK/8-QAM/16-QAM – 2 dimensional
Rate 0.95 (optional plug-in card) QPSK/8-QAM/8-PSK –
2 dimensional eTPC (exact Code Rate is actually 17/18, or 0.944)
VersaFEC Codec, 6-bit soft-decision (FAST Option):
Rate 0.488 BPSK (also 0.493 BPSK Ultra-Low-Latency
Rate 0.533, 0.631, 0.706, 0.803 QPSK (0.493, 0.654, 0.734 Ultra-
Low-Latency
Rate 0.642, 0.711, 0.780 8-QAM (also 0.576 8-QAM Extended
CCM
Rate 0.731, 0.780, 0.829, 0.853 16-QAM (also 0.644 16-QAM
Extended CCM
Scrambling Transparent Closed Network mode - per ITU V.35 (Intelsat variant)
Turbo Product Code mode - externally frame synchronized – proprietary
Acquisition Range ±1 to ±32 kHz, programmable in 1 kHz increments, for symbol rates
below 625 ksymbols/sec
±1 to ±200 kHz, 1 kHz increments, for symbol rates above 625
ksymbols/sec, L-Band only
Acquisition Time Highly dependent on data rate, FEC rate, and demodulator acquisition
range.