Cisco Cisco D9824 Advanced Multi Decryption Receiver 安装指南

Appendix A

Technical Specifications

326

OL-29015-01

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 D9824 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