Comtech EF Data SDM-2020, Installation And Operation Manual

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SDM-2020 Satellite Demodulator Introduction
Rev. 3 1–7
1.2.3 FAST Options
Certain options are enabled using EFData’s Fully Accessible System Topology (FAST)
features described in Appendix C. The software requirements for the FAST options are
also listed in Appendix C. Options include:
•
Original Equipment Manufacturer (OEM) LCD (See Appendix B)
•
8PSK – DVB
•
16QAM – DVB
•
2 L-Band Inputs
•
4 L-Band Inputs
1.3 Specifications
1.3.1 Demodulator
Table 1-7 describes the demodulator specifications.
Table 1-7. Demodulator Specifications
General Specifications
Transmission Format QPSK per EN 300 421
Optional – 8PSK and 16QAM per EN 301 210
BER Performance See paragraph 1.4.
Notes:
1. Values shown for 8PSK 8/9 are for symbol rates
≤
30 Msym/s.
2. For 8PSK 8/9 at symbol rate > 30 Msym/s, add 0.4 dB.
Data Rate/Symbol Rate 1.5 to 100 Mbit/s in 1 bit/s increments depending upon symbol rate and data
interface, see Table 1-1, Table 1-2, and Table 1-3.
Equivalent Serial Data Rate at 96 DIN
Connector Minimum and maximum data rate and symbol rates,
see Table 1-1, Table 1-2, and Table 1-3.
Framing
187
Data Rate = SR x m x CRv x (187/204)
188 Data Rate = SR x m x CRv x (188/204)
204 Data Rate = SR x m x CRv x (204/204)
SR = Symbol Rate
m = 2 QPSK, 3 8PSK, 4 16QAM
CRv = Viterbi/trellis code rate 1/2, 2/3, 3/4, 5/6, 7/8, and 8/9
Data Rate Tolerance
Programmed rate
±
100 ppm
Modulation Type and Inner Code Rate QPSK: 1/2, 2/3, 3/4, 5/6, 7/8
Optional - 8PSK: 2/3, 5/6, 8/9
Optional - 16QAM 3/4, 16QAM 7/8
Outer Code Rate (Reed-Solomon) RS (204, 188, t = 8) per EN 300 421 and EN 301 210
Deinterleaving Depth 12, per EN 300 421 and EN 301 210
Spectral Shaping
Square-root raised cosine,
∝
= 0.35 per EN 300 421 and EN 301 210
Energy Dispersal EN 300 421 and EN 301 210, or None