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CDD-880 Multi Receiver Router
Appendix H
H.7
Summary of Specifications
System Type
Symbol Rate Range
Interface
Remote Es/No Teporting
Max Span of Data Rate
Switch Point (Decreasing SNR)
Switch Point Hysteresis
Max Fading Rate
Max MODCOD Update Rate
Configurable Parameters
System Latency
Monitored Parameters
Modulation
Code Rate
(MODCOD No.)
BPSK (00)
0.488
QPSK (01)
0.533
QPSK (02)
0.631
QPSK (03)
0.706
QPSK (04)
0.803
8-QAM (05)
0.642
8-QAM (06)
0.711
8-QAM (07)
0.780
16-QAM (08)
0.731
16-QAM (09)
0.780
16-QAM (10)
0.829
16-QAM (11)
0.853
Adaptive Coding and Modulation, using BPSK, QPSK, 8-QAM , 16-QAM and
VersaFEC short-block LDPC coding – total of 12 MODCODs (00 through 11)
16 ksps to 4500 ksps
10/100 BaseT Ethernet, with auto-negotiated Congestion Control
Automatically reported by the CDD-880 and sent to the CDM-840 Management IP
Interface.
7:1 over range of adaptation
Corresponds to SNR (Es/No) that gives BER = 5 x 10
0.3 dB
Approximately 1 dB/second (higher if Target Eb/No margin > 1 dB)
One update every 0.5 seconds during fast fade conditions, and every 30 seconds
when the measured Es/No is stable.
• Maximum MODCOD (MODCOD 00 through MODCOD 11)
• Target Es/No margin (0.0 to 4.5 dB, 0.5 dB steps)
34 milliseconds max (not including WAN buffer, or satellite path)
Tx and Rx MODCODs
•
CDD-880 Es/No
•
(-3.0 dB to +22.0dB, 0.1dB resolution, ±0.5 dB accuracy)
Config and monitor menus displaying data rate, modulation and code rate update
•
dynamically with MODCOD
Typical Eb/No, for
Spectral
BER = 5 x 10
Efficiency, bps/Hz
0.49
1.07
1.26
1.41
1.61
1.93
2.13
2.34
2.93
3.12
3.32
3.41
H–13
(margin set to 0 dB)
-8
Data Rate, ACM Mode
-8
Minimum (kbps)
(dB)
2.4
16
2.2
17
2.7
20
3.4
22
3.8
25
4.6
30
5.2
34
5.6
37
6.5
46
7.1
49
7.7
53
8.1
54
MN-CDD880
Revision 2
Maximum (Mbps)
2.2
4.81
5.67
6.34
7.24
8.68
9.58
10.53
13.18
14.04
14.94
15.34
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