Demodulator
Specifications
Frequency Range
CDM-570 & CDM-570-IP: 50 to 90 or
100 to 180 MHz, 100 Hz resolution
CDM-570L & CDM-570L-IP:
950 to 2000 MHz, 100 Hz resolution
Data Interfaces
EIA-422/-530 DCE, V.35 DCE, Sync EIA-232,
10/100Base-T Ethernet (option), G.703 T1 balanced
(option), G.703 E1 balanced or unbalanced (option)
Data Rate Range
(See user manual for
details)
2.4 kbps to 9.98 Mbps (depending on modulation,
FEC and framing), 1 bps step with fully independent
TX and RX rates
Modulation & FEC
Data Rate Range
5/16 BPSK TPC
2.4 kbps to 0.937 Mbps
21/44 BPSK TPC
2.4 kbps to 1.430 Mbps
1/2 BPSK
2.4 kbps to 1.500 Mbps
1/2 QPSK/OQPSK
4.8 kbps to 3.000 Mbps
3/4 QPSK/OQPSK
7.2 kbps to 4.500 Mbps
7/8 QPSK/OQPSK
8.4 kbps to 5.250 Mbps
2/3 8PSK TCM
8.7 kbps to 4.400 Mbps
21/44 QPSK/OQPSK TPC
4.8 kbps to 2.860 Mbps
3/4 QPSK/OQPSK TPC
7.2 kbps to 4.500 Mbps
7/8 QPSK/OQPSK TPC
8.4 kbps to 5.250 Mbps
0.95 QPSK/OQPSK TPC
9.1 kbps to 5.666 Mbps
3/4 8PSK/8-QAM TPC
10.8 kbps to 6.750 Mbps
7/8 8PSK/8-QAM TPC
13.6 kbps to 7.875 Mbps
0.95 8PSK/8-QAM TPC
15.3 kbps to 8.500 Mbps
3/4 16-QAM TPC
14.4 kbps to 9.000 Mbps
7/8 16-QAM TPC
16.8 kbps to 9.980 Mbps
Uncoded BPSK
4.8 kbps to 3.000 Mbps
Uncoded QPSK/OQPSK
9.6 kbps to 5.000 Mbps
Note:
Data rate specifications reflect CDM-570/L or CDM-570/L-IP modem
operating in non-Vipersat mode
Scrambling
Mode dependent – ITU V.35, or proprietary
externally synchronized
FEC Options
Viterbi
Rate 1/2 BPSK, QPSK/OQPSK
Rate 3/4 and 7/8 QPSK/OQPSK
and 16-QAM w/RS
TCM
8PSK 2/3
(Closed network – not IESS-310)
Turbo Product Coding
Rate 21/44 BPSK, 5/16 BPSK,
Rate 21/44 QPSK/OQPSK
Rate 3/4 and Rate 7/8 QPSK/OQPSK,
8PSK/8-QAM and 16-QAM
Rate 0.95 QPSK/OQPSK and 8PSK/8-QAM
Reed-Solomon
Proprietary 220/200 and 200/180
modes available
Uncoded
BPSK, QPSK/OQPSK
M&C Interface
EIA-232, EIA-485 (2- or 4-wire),
Ethernet 10/100Base-T (dependent on operational mode)
Input/Output Impedance
CDM-570 & CDM-570-IP: matched for
50/75
n
, BNC connector
CDM-570L & CDM-570L-IP: transmit and receive
50
n
, female Type N connector
External Reference Input
1, 2, 5, 10 or 20 MHz, BNC connector
Form C Relays
TX, RX traffic alarms and unit faults
Modulator
CDM-570 &
CDM-570-IP
CDM-570L &
CDM-570L-IP
Frequency Stability
±
1 ppm, 0º to 50ºC
(32º to 122ºF)
±
0.06 ppm, 0º to 50ºC
(32º to 122ºF)
Output Power
0 to –25 dBm, 0.1 dB
steps
0 to –40 dBm, 0.1 dB
steps
Accuracy
±
0.5 dB over frequency
and temperature
±
1.0 dB over frequency
and temperature
Phase Noise
< 0.75 degrees RMS
double-sided,
100 Hz to 1 MHz
< 1.2 degrees RMS
double-sided,
100 Hz to 1 MHz
Output Spectrum/
Filtering
Meets IESS-308/-309 power spectral mask
Harmonics and Spurious
<
-55 dBc/4 kHz
(typically < -60 dBc/4 kHz)
Transmit On/Off Ratio
55 dB minimum
External TX Carrier Off
By TTL LOW signal, or RTS
TX Clock Options
Internal (SCT), external (TT), loop timing with
symmetric or asymmetric operation (data interface
dependent)
CDM-570 &
CDM-570-IP
CDM-570L &
CDM-570L-IP
Input Power Range
-30 to -60 dBm
-130 + 10 log symbol rate,
dBm (minimum)
-90 + 10 log symbol rate,
dBm (maximum)
Max Composite Level
+35 dBc, up to
-5 dBm absolute max.
+40 dBc, up to
-10 dBm absolute max.
Acquisition Range
±
1 to
±
32 kHz,
1 kHz step
±
1 to
±
32 kHz,
1 kHz step, symbol rate <=
625 ksps
±
1 to
±
200 kHz,
1 kHz step, symbol rate >
625 ksps
Acquisition Time
Highly dependent on data rate, FEC rate, and
demodulator acquisition range. Example:
120 ms average at 64 kbps, Rate 1/2 QPSK, ± 10 kHz
acquisition sweep range, 6dB Eb/No
Receive Buffer
512, 1024, 2048, 4096, 8182, or 16384 bits
Receive Clock Options
Buffer disabled (RX satellite), buffer enabled
(symmetric or asymmetric operation) (data interface
dependent)
Clock Tracking
±
100 ppm minimum
Monitor Functions
E
b
/N
o
, frequency offset, BER, buffer fill status, RX
signal level
Example BER Performance
For symbol rates up to 2.5 Msps (See user’s manual for higher symbol rates).
Guaranteed E
b
/N
o
, in dB (typical values in parentheses) with two adjacent carriers 7
dB higher. (See the user’s manual for a complete listing of the performance of all
FEC types, code rates, and modulation types.)
Viterbi
BPSK,
QPSK/OQPSK
1/2
3/4
7/8
10
-5
5.4 (4.9)
6.8 (6.3)
7.7 (7.2)
10
-7
6.7 (6.2)
8.2 (7.7)
9.0 (8.6)
Viterbi & Concatenated Reed-Solomon 220/200 or 200/180
BPSK,
QPSK/OQPSK
1/2
3/4
7/8
10
-5
4.3 (4.0)
5.6 (4.7)
6.5 (6.0)
10
-7
4.5 (4.2)
6.0 (5.2)
6.9 (6.5)
Turbo Product Codec
BPSK
5/16
21/44
10
-6
2.4 (2.1)
2.8 (2.5)
10
-7
2.6 (2.3)
3.1 (2.8)
10
-8
2.7 (2.4)
3.3 (2.9)
QPSK/OQPSK
21/44
3/4
7/8
0.95
10
-6
2.9 (2.6)
3.8 (3.4)
4.3 (4.0)
6.4 (6.0)
10
-8
3.3 (2.8)
4.4 (4.0)
4.5 (4.2)
6.9 (6.5)
8PSK
3/4
7/8
0.95
10
-6
6.2 (5.8)
7.0 (6.6)
9.3 (8.9)
10
-8
6.8 (6.3)
7.2 (6.8)
10.3 (9.9)
8-QAM
3/4
7/8
0.95
10
-6
6.5 (6.1)
6.6 (6.2)
9.6 (9.2)
10
-8
7.2 (6.8)
6.8 (6.4)
10.6(10.2)
16-QAM
3/4
7/8
10
-6
7.4 (7.0)
8.1 (7.7)
10
-7
7.8 (7.3)
8.2 (7.8)
10
-8
8.2 (7.7)
8.3 (7.9)
Low-Noise Block Converter (LNB) Support
(CDM-570L & CDM-570L-IP Only)
LNB Voltage
+13, +18, and +24 VDC @ 500 mA maximum
LNB Reference
10 MHz via RX center conductor,
-3 dBm ± 3 dB
Block Up Converter (BUC) Support
(CDM-570L & CDM-570L-IP Only)
BUC Voltage
24 VDC, 90 W @ 50°C, 100 W @ 30°C
(internally fitted option)
48 VDC, 150 W @ 50°C, 180 W @ 30°C
(internally fitted option, not available with -24 VDC
input)
BUC Reference
10 MHz via TX center conductor,
0 dBm ± 3 dB
FSK Support
Via TX center conductor with FSK BUCs
