Comtech EF Data CDM-570A Installation And Operation Manual page 134

6.3.2.3.4 (CONFIG: Tx) Data (Data Rate)
The VersaFEC ACM (IP-ACM) or VersaFEC-2 ACM (V2-ACM) modes change the
(CONFIG: Tx) Data (Data Rate) to (CONFIG:Tx) Symb (Symbol Rate) when active.
Refer to Section 6.3.2.3.5 for details.
TxDataRate:00031.139kbps
0063.866ksps (◄ ►,▲ ▼,ENT)
The Tx Data Rates associated with selection of the VFEC (VersaFEC),
ULL (Ultra Low Latency), Tx FEC types are UNAVAILABLE when operating in
CDM-570 Compatible Mode. See Section 6.2 for further information.
The overall range of data rates is from 2.4 to 10239 kbps. The overall range of
symbol rates is from 37 to 3000 ksps. The minimum and maximum data rates are
dependent on modulation type and FEC encoder rate. If you change the
modulation or FEC type and the currently selected data rate is no longer supported,
the modem then automatically adjusts the data rate up or down, keeping the
symbol rate constant. The bottom line of the display shows the symbol rate, based
on FEC type, Modulation type, FEC Code Rate, and Data Rate. The table that
follows lists the valid range of data rates.
If G.703 is the current interface type, the data rate is automatically set to either
1544 kbps (T1) or 2048 kbps (E1).
IMPORTANT NOTE – Where noted in the following table, if EDMAC framing is
employed, the upper data rate is 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 TPC, or Rate 5/16 BPSK TPC.
FEC Type Modulation
BPSK
Viterbi
QPSK/OQPSK
BPSK
QPSK/OQPSK
Viterbi + R-S
16-QAM
Front Panel Operation
CDM-570A/570AL Satellite Modem with Optional Packet Processor
Data Rate Range
Code Rate
Lower Limit
(kbps)
1/2 2.4
1/2 4.8
3/4 7.2
7/8 8.4
1/2 2.4
1/2 4.3
3/4 6.5
7/8 7.5
3/4 13.0
7/8 16.8
6–18
EDMAC limited?
Upper Limit
(Mbps)
1.500
3.000
4.500
5.250
1.363
Yes – see preceding
"IMPORTANT" Note 4
2.727
4.091
4.666
4.000
4.666
Revision 5
MN-CDM570A