6 data rate ranges – Comtech EF Data CDM-570A User Manual
Page 54
CDM-570A/570AL Satellite Modem with Optional Packet Processor
MN-CDM570A
Introduction
Revision 2
1–20
Connector
Function
Type
External Reference Input/Output As an input: 1, 2, 5 or 10MHz -6dBm to +10dBm (nominal 50/75 Ω, BNC
female connector)
As an output: 10MHz, 2.7 volts peak-to-peak ± 0.4 volts, low impedance
output
(The Ext. reference phase locks Tx and Rx synthesizers, and all baseband
clock generation)
BNC (female)
Modem Alarms
Relay outputs (Tx, Rx & unit faults)
Demodulator I & Q test outputs (constellation)
Demodulator Rx Signal Level output (0 to 10 volts)
External carrier off input
15-pin D-sub (male)
1:1 Control
Async serials link to other modem, and switching signals in 1:1 pair, via CRS-
170A
9-pin D-sub (female)
Alarm Relay
Type: Form C Contacts. Rating: 125V AC/30V DC, 0.3A AC/1A DC
15-pin D-sub (male)
Remote Control
EIA-232 or EIA-485 modem control and monitoring
9-pin D-sub (male)
Ethernet
10/100 Base Tx for http, SNMP and Telnet interfaces
RJ-45
1.3.6 Data Rate Ranges
FEC Type
Modulation
Code Rate
Data Rate Range
EDMAC limited?
Lower Limit (kbps)
Upper Limit (Mbps)
None
BPSK
Uncoded
4.8
3.000
Yes – see “Important
Note” below
QPSK/OQPSK
Uncoded
9.6
5.000
Viterbi
BPSK
1/2
2.4
1.500
QPSK/OQPSK
1/2
4.8
3.000
3/4
7.2
4.500
7/8
8.4
5.250
Viterbi + R-S
BPSK
1/2
2.4
1.363
QPSK/OQPSK
1/2
4.3
2.727
3/4
6.5
4.091
7/8
7.5
4.666
16-QAM
3/4
13.0
4.000
7/8
16.8
4.666
TCM + R-S
8-PSK
2/3
8.7
4.400
Turbo
BPSK
5/16
2.4
0.937
21/44
2.4
1.430
QPSK/OQPSK
21/44
4.8
2.860
3/4
7.2
4.500
7/8
8.4
5.250
0.95
9.1
5.666
8-PSK/8-QAM
3/4
10.8
6.750
No
7/8
13.6
7.875
0.95
15.3
8.500
16-QAM
3/4
14.4
9.000
7/8
16.8
9.980
VersaFEC
BPSK
0.488
2.4
1.462
No
QPSK
0.533
5.2
3.200
0.631
6.1
3.785
0.706
6.8
4.233
0.803
7.8
4.818