Premier Mounts CDM-600 Available TPC and Ldpc Modes, TPC Code Rate/Modulation Data Rate Range

CDM-600 Satellite Modem	Revision 7
Forward Error Correction Options	MN/CDM600.IOM

It is clear that in order to provide the best possible performance over the range of code rates from 1/2 to 0.95, both an LDPC and a TPC codec need to be offered.

In order to meet this requirement, Comtech EF Data has developed a combination LDPC/TPC Codec module that can be added to the CDM-600 Modem, and which provides the following operating modes:

Table 7-5. Available TPC and LDPC Modes

TPC Code Rate/Modulation	Data Rate Range
Rate 21/44 BPSK	4.8 kbps to 3.2 Mbps	(to 4.772 Mbps with High Rate Turbo card)
Rate 5/16 BPSK	4.8 kbps to 2.048 Mbps	(to 3.12 Mbps with High Rate Turbo card)
Rate 1/2 QPSK, OQPSK	4.8 kbps to 9.54 Mbps	(High Rate Turbo card only)
Rate 3/4 QPSK, OQPSK	7.2 kbps to 5.0 Mbps	(to 15 Mbps with High Rate Turbo card)
Rate 3/4 8-PSK	10.8 kbps to 5.0 Mbps	(to 20 Mbps with High Rate Turbo card)
Rate 3/4 16-QAM	14.4 kbps to 5.0 Mbps	(to 20 Mbps with High Rate Turbo card)
Rate 7/8 QPSK, OQPSK	8.4 kbps to 17.5 Mbps	(High Rate Turbo card only)
Rate 7/8 8-PSK	12.6 kbps to 20 Mbps	(High Rate Turbo card only)
Rate 7/8 16-QAM	16.8 kbps to 20 Mbps	(High Rate Turbo card only)
Rate 0.95 QPSK, OQPSK	9.1 kbps to 18.888 Mbps	(High Rate Turbo card only)
Rate 0.95 8-PSK	13.6 kbps to 20 Mbps	(High Rate Turbo card only)
LDPC Code Rate/Modulation	Data Rate Range
Rate 1/2 BPSK	4.8 kbps to 5.0 Mbps	(TPC/LDPC Codec card only)
Rate 1/2 QPSK, OQPSK	4.8 kbps to 10.0 Mbps	(TPC/LDPC Codec card only)
Rate 2/3 QPSK, OQPSK	6.4 kbps to 13.3 Mbps	(TPC/LDPC Codec card only)
Rate 2/3 8-PSK , 8-QAM	9.6 kbps to 19.0 Mbps	(TPC/LDPC Codec card only)
Rate 3/4 QPSK, OQPSK	7.2 kbps to 15.0 Mbps	(TPC/LDPC Codec card only)
Rate 3/4 8-PSK , 8-QAM	10.8 kbps to 20.0 Mbps	(TPC/LDPC Codec card only)
Rate 3/4 16-QAM	14.4 kbps to 20.0 Mbps	(TPC/LDPC Codec card only)

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