CDM-570/570L Satellite Modem with Optional IP Module Revision 4
Front Panel Operation MN/CDM570L.IOM
6–14

6.7.4 (CONFIG, TX) DATA RATE

The overall range of data rates is from 2.4 to 9980 kbps. The overall range of symbol
rates is from 4.8 to 3000 ksymbols/second. The minimum and maximum data rates are
dependent on modulation type and FEC encoder rate. If user changes the modulation or
FEC, and the currently selected data rate can no longer be supported, then the data rate
will be adjusted automatically, up or down, keeping the symbol rate constant. The
bottom line of the display shows the symbol rate, based on FEC type, modulation, FEC
Code Rate, and Data Rate. The valid ranges of data rate are shown in the table below.
If the current interface type is selected to be G.703, the data rate will be automatically set
to either 1544 kbps (T1) or 2048 kbps (E1).
FEC Type Modulation Code Rate Data Rate Range EDMAC limited?
None BPSK Uncoded 4.8 kbps to 3.000 Mbps Yes – see note below
None QPSK/OQPSK Uncoded 9.6 kbps to 5.000 Mbps Yes – see note below
Viterbi BPSK Rate 1/2 2.4 kbps to 1.500 Mbps Yes – see note below
Viterbi QPSK/OQPSK Rate 1/2 4.8 kbps to 3.000 Mbps Yes – see note below
Viterbi QPSK/OQPSK Rate 3/4 7.2 kbps to 4.500 Mbps Yes – see note below
Viterbi QPSK/OQPSK Rate 7/8 8.4 kbps to 5.250 Mbps Yes – see note below
Viterbi + RS BPSK Rate 1/2 2.4 kbps to 1.363 Mbps Yes – see note below
Viterbi + RS QPSK/OQPSK Rate 1/2 4.3 kbps to 2.727 Mbps Yes – see note below
Viterbi + RS QPSK/OQPSK Rate 3/4 6.5 kbps to 4.091 Mbps Yes – see note below
Viterbi + RS QPSK/OQPSK Rate 7/8 7.5 kbps to 4.666 Mbps Yes – see note below
Viterbi + RS 16-QAM Rate 3/4 13.0 kbps to 4.000 Mbps Yes – see note below
Viterbi + RS 16-QAM Rate 7/8 16.8 kbps to 4.666 Mbps Yes – see note below
TCM + RS 8-PSK Rate 2/3 8.7 kbps to 4.400 Mbps Yes – see note below
Turbo BPSK Rate 5/16 2.4 kbps to 0.937 Mbps Yes – see note below
Turbo BPSK Rate 21/44 2.4 kbps to 1.430 Mbps Yes – see note below
Turbo QPSK/OQPSK Rate 21/44 4.8 kbps to 2.860 Mbps Yes – see note below
Turbo QPSK/OQPSK Rate 3/4 7.2 kbps to 4.500 Mbps Yes – see note below
Turbo QPSK/OQPSK Rate 7/8 8.4 kbps to 5.250 Mbps Yes – see note below
Turbo QPSK/OQPSK Rate 0.95 9.1 kbps to 5.666 Mbps Yes – see note below
Turbo 8-PSK/8-QAM Rate 3/4 10.8 kbps to 6.750 Mbps No
Turbo 8-PSK/8-QAM Rate 7/8 13.6 kbps to 7.875 Mbps No
Turbo 8-PSK/8-QAM Rate 0.95 15.3 kbps to 8.500 Mbps No
Turbo 16-QAM Rate 3/4 14.4 kbps to 9.000 Mbps No
Turbo 16-QAM Rate 7/8 16.8 kbps to 9.980 Mbps No
Important Note: Where noted in the table above, if EDMAC framing is employed, the upper data rate
will be reduced by 5% for data rates up to 2.048 Mbps, and by 1.6% for data rates above 2.048 Mbps,
where EDMAC2 framing is used, or for Rate 21/44 BPSK/QPSK Turbo, or Rate 5/16 BPSK Turbo.

Tx Dat Rate:5000.000kbps

3000.000ksym (◄ ►,▲ ▼,ENT)

IMPORTANT