Comtech EF Data SDM-2020 - Manual (Page 53)

5–1
Chapter 5. SPECIFICATION
This chapter describes the specification for the SDM-2020.
5.1 Specifications
Table 5-1. Demodulator Specifications
General Specifications
Transmission Format QPSK per EN 300 421
Optional: 8-PSK and 16-QAM per EN 301 210
BER Performance See paragraph 5.2.
Notes:
1. Values shown for 8-PSK 8/9 are for symbol rates ≤ 30 Msym/s.
2. For 8-PSK 8/9 at symbol rate > 30 Msym/s, add 0.4 dB.
Data Rate/Symbol Rate 1.5 to 100 Mbps in 1 bit/s increments depending upon symbol rate and data
interface, see Table 5-4, Table 5-5, and Table 5-6.
Equivalent Serial Data Rate at 96 DIN
Connector
Minimum and maximum data rate and symbol rates,
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 8-PSK, 4 16-QAM
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: 8-PSK: 2/3, 5/6, 8/9
Optional: 16-QAM 3/4, 16-QAM 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