Cisco D9854 - Page 398

Appendix A
Technical Specifications
374
Parameter
Specification
Eb/No (C/N) Ratio
See DVB-S2 Satellite Receiver Input, DVB-S
Eb/No (C/N) Ratio Table
DVB-S2 Modulation (EN 302 307)
Modulation
QPSK, 8PSK
Pilots On/Off
Pilots On
QPSK LDPC FEC Rates
1/2, 3/5, 2/3, 3/4, 4/5, 5/6, 8/9, 9/10
8PSK LDPC FEC Rates
3/5, 2/3, 3/4, 5/6, 8/9, 9/10
LDPC FEC Frame Length
Normal
Symbol Rate Range
1 to 30 Ms/s
Maximum Channel Bit Rate
90 Mb/s
Maximum User Bit Rate
78.55 Mb/s
DVB-S Eb/No (C/N) Ratio
Convolutional FEC Rate
Eb/No Ratio (dB) in
Linear Channel and IF
Loop configuration
C/N at DVB Threshold
(BW = Symbol Rate)
1/2
4.5
4.1
2/3
5.0
5.9
3/4
5.5
6.9
5/6
6.0
7.9
7/8
6.4
8.5
C/N = Eb/No + 10 log (2 x FEC X 188/204)
The D9854/D9854-I receiver displays the C/N Ratio.
DVB-S2 Error Rate Performance Es/No (C/N) Ratio
Mode
Simulated Es/No (dB) for
FEC Frame length = 64,800
Typical Performance (dB) in
Linear Channel and IF Loop
configuration
QPSK 1/2
1.00
1.2
QPSK 3/5
2.23
2.4
QPSK 2/3
3.10
3.2
QPSK 3/4
4.03
4.2