CDM-425 Advanced Satellite Modem

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CDM-425 Advanced Satellite Modem

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  • DoubleTalk Carrier-in-Carrier bandwidth compression
  • Carrier-in-Carrier Automatic Power Control
  • 5%, 10%, 15%, 20%, 25% and 35% Transmit Filter Rolloff
  • Integrated 4-port managed Ethernet switch with VLAN and QoS
  • Jumbo frame support

SKU: CMT179 Tags: , , , ,
  • Description
  • Technical Specifications
  • Support Documents

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CDM-425 Advanced Satellite Modem

The CDM-425 Advanced Satellite Modem continues to build on our legacy of providing the most efficient and reliable satellite modems. It offers the most popular and powerful features of the CDM-625A, with a smaller footprint and less power. Its Forward Error Correction options comprise 18 VersaFEC ModCods and 74 VersaFEC-2 ModCods, permitting the user to optimize for latency and coding gain for any link budget. It includes DoubleTalk, Carrier-in-Carrier, bandwidth compression, additional TX rolloffs and sophisticated packet processing capabilities. This combination of advanced technologies enables multi-dimensional optimization, allowing satellite communications users to:

  • Minimize operating expenses (OPEX)
  • Maximize throughput without using additional transponder resources
  • Maximize availability (margin) without using additional transponder resources
  • Minimize capital expenses (CAPEX) by allowing a smaller BUC/HPA and/or antenna
  • Or, a combination to meet specific business needs

Features

  • DoubleTalk Carrier-in-Carrier bandwidth compression
  • Carrier-in-Carrier Automatic Power Control
  • VersaFEC-2 High Performance LDPC with Adaptive Coding and Modulation (ACM), Short Block and Long Block – similar performance to DVB-S2X with significantly lower latency.
  • VersaFEC FEC with Adaptive Coding and Modulation (ACM), both standard and Ultra-Low Latency (ULL)
  • 5%, 10%, 15%, 20%, 25% and 35% Transmit Filter Rolloff
  • Optional Packet Processor with header compression, payload compression, advanced Quality of Service (QoS) and Managed Switch Mode with VLAN support
  • Integrated 4-port managed Ethernet switch with VLAN and QoS
  • Jumbo frame support
  • Dual Band Capability: 70/140 MHz and extended L-Band (950 – 2250 MHz) in same unit
  • Data Rate: 18 kbps to 25 Mbps
  • Symbol Rate: 18 ksps to 12.5 Msps
  • Modulation: BPSK, QPSK, 8-QAM/8-ARY, 16-QAM/16-ARY, 32-ARY
  • FEC: VersaFEC (low-latency LDPC) and VersaFEC-2 (high performance LDPC)
  • Wide Range of data interfaces: EIA-422/530, V.35, G.703 T1/E1, Quad G.703 E1, 4-port 10/100Base-T Ethernet
  • IEEE 1588v2 Precision Time Protocol
  • Sub Mux to multiplex IP/Ethernet traffic with serial or G.703 traffic
  • Drop & insert for T1/E1
  • Enhanced D&I++ for single T1/E1 & quad E1
  • Management: 10/100Base-T Ethernet with SNMP, Distant End SNMP Proxy, HTTP, Telnet and EIA-232/EIA-485
  • RADIUS Client
  • ETSI compliant Carrier ID using MetaCarrier® Technology
  • Embedded Distant-end Monitor and Control (EDMAC)
  • Automatic Uplink Power Control (AUPC), and combined AUPC and ACM
  • Standard high-stability internal reference (± 6 x 10-8)
  • L-Band TX: 10 MHz reference for BUC, FSK communications and optional BUC power supply
  • L-Band RX: 10 MHz reference and LNB power supply
  • L-Band: Advanced FSK for LPOD M&C
  • 1:1 and 1:10 redundancy switches available
  • Backwards compatible with CDM-625 (VersaFEC modes) and CDM-625A (VersaFEC and VersaFEC-2 modes)

Specifications
Data Rate 18 kbps to 25 Mbps, in 1 bps steps
(modulation, FEC & data interface dependant)
Symbol Rate 18 ksps to 12.5 Msps
Operating 950 – 2250 MHz (standard)
Frequency 50 – 180 MHz (option)
100 Hz resolution, independent TX and RX operation
Major Operating Modes VersaFEC and VersaFEC-2 Codec with Adaptive Coding and
Modulation (ACM) or Constant Coding & Modulation (CCM)
EDMAC Framed with/without AUPC
Drop & insert (D&I) /Enhanced D&I++ (option)
Quad E1 drop & insert (QDI) (option)
DoubleTalk Carrier-in-Carrier (option)
FEC & Modulation
VersaFEC Codec BPSK Rate 0.488
QPSK Rate 0.533, 0.631, 0.706, 0.803
8-QAM Rate 0.576 (ECCM), 0.642, 0.711, 0.780
16-QAM Rate 0.644 (ECCM), 0.731, 0.780, 0.829, 0.853
BPSK 0.493 (ULL)
QPSK 0.493, 0.654, 0.734 (ULL)
VersaFEC-2 Codec Long Block BPSK Rate 0,489
QPSK Rate 0.489, 0.537, 0.586, 0.611, 0.635, 0.660, 0.684, 0.733
8-ARY Rate 0.521, 0.537, 0.562, 0.586, 0.611, 0.635, 0.660, 0.684, 0.708, 0.733
16-ARY Rate 0.586, 0.611, 0.635, 0.660, 0.684, 0.708, 0.733, 0.757, 0.782
32-ARY Rate 0.660, 0.684, 0.708, 0.733, 0.757, 0.782, 0.801, 0.831, 0.855, 0.879
VersaFEC-2 Codec Short Block BPSK Rate 0,489
QPSK Rate 0.489, 0.537, 0.586, 0.611, 0.635, 0.660, 0.684, 0.733
8-ARY Rate 0.521, 0.537, 0.562, 0.586, 0.611, 0.635, 0.660, 0.684, 0.708, 0.733
16-ARY Rate 0.586, 0.611, 0.635, 0.660, 0.684, 0.708, 0.733, 0.757, 0.782
32-ARY Rate 0.660, 0.684, 0.708, 0.733, 0.757, 0.782, 0.801, 0.831
Scrambling ITU V.35 (Intelsat variant)/ IESS-315
Management 10/100Base-T Ethernet with SNMP, HTTP and Telnet support, EIA-232, EIA-485 (2- or 4-wire)
Form C Relays Hardware fault, RX and TX traffic alarms
External Reference (Input OR Output) BNC connector
Input: 1, 2, 5, or 10 MHz, -6 dBm to +10 dBm, 50 Ω/75 Ω (nominal)
Output: 10 MHz, 2.7 V peak-to-peak ± 0.4 V, low impedance output
Data Interfaces
EIA-422/-530 DCE, Up to 14 Mbps 25-pin D-sub (female)
V.35 DCE, Up to 14 Mbps 25-pin D-sub (female)
G.703 T1, 1.544 Mbps (Balanced 100 Ω) 9-pin D-sub (female) or
BNC (female)
G.703 E1, 2.048 Mbps
(Unbalanced 75 Ω or balanced 120 Ω)
9-pin D-sub (female) or
BNC (female)
Additional 2.048 Mbps E1 Ports for Quad-E1
(Balanced 120 Ω)
9-pin D-sub (female)
Modem Alarms 15-pin D-sub (male)
4-port 10/100Base-T
Managed Ethernet Switch
(Optional Packet Processor Available)
4 x RJ-45
Modulator
Frequency Stability ± 0.06 ppm (± 6 x 10-8), 0° to 50°C (32° to 122°F) with internal reference
Transmit Filtering Alpha = 35%, per IESS-308
Additional Alphas (Rolloff) 5%, 10%, 15%, 20% and 25%
Harmonics and Spurious Better than -60 dBc/4 kHz
(typically <-65 dBc/4kHz)
Measured from 1 to 500 MHz
(50-180 MHz band)
Measured F0 ± 500 MHz
(950-2250 MHz band)
Transmit On/Off Ratio -60 dBc minimum
Output Phase Noise < 0.48° rms double sided, 100 Hz to 1 MHz
(Minimum 16 dB better overall than the Intelsat IESS-308/309 requirements)
dB/Hz Frequency Offset
-63.0 100 Hz
-73.0 1 kHz
-83.0 10 kHz
-93.0 100 kHz
Fundamental AC line spurious is -42 dBc or lower The sum of all other single sideband spurious, from 0 to 0.75 x symbol rate, is -48 dBc or lower
Output Power 50-180 MHz:
0 to -25 dBm, 0.1 dB steps
950-2250 MHz:
0 to -40 dBm, 0.1 dB steps
Power Accuracy 50-180 MHz:
± 0.5 dB over frequency, data rate, modulation type and temperature range of 15 to 35° C
± 0.8 dB over frequency, data rate, modulation type and temperature range of 0 to 50° C
950-2250 MHz:
± 0.5 dB over frequency, data rate, modulation type and temperature range of 15 to 35° C
± 0.7 dB over frequency, data rate, modulation type and temperature range of 0 to 50° C
Output Impedance & Return Loss 50-180 MHz: 50 Ω/75 Ω, 16 dB minimum return loss
(18 dB typical), BNC connector
950-2250 MHz: 50 Ω, 18 dB minimum return loss
(21 dB typical), Type-N connector
Clocking Options Internal, ± 0.06 ppm (SCT)
External, locking over a ± 100 ppm range (TT)
Loop timing (RX satellite clock) – supports
asymmetric operation
External clock
External TX Carrier Off By TTL ‘low’ signal or external contact closure
BUC Reference (10 MHz) Via TX IF center conductor, 10.0 MHz
± 0.06 ppm (with internal reference), selectable
on/off, 0.0 dBm ± 3 dB
BUC Power Supply (HW Option) 24 VDC, 4.17 Amps max., 90 W @ 50° C
48 VDC, 3.125 Amps max., 150 W @ 50° C
(180 W @ 30° C)
Supplied through TX IF center conductor and selectable on/off via M&C control
Demodulator
Input Power Range,
Desired Carrier
50-180 MHz: -105 + 10 log (symbol rate) to -70 + 10 log (symbol rate) dBm
950-2250 MHz: -130 + 10 log (symbol rate) to -80 + 10 log (symbol rate) dBm
Max Composite Operating Level 50-180 MHz and 950-2250 MHz: For symbol rates < 224 ksps, ≥ 47 dBc
For symbol rates ≥ 224 ksps, 99 – 10 log (symbol rate, desired carrier) dBc, +10 dBm max., with the additional requirement that within ± 10 MHz of the desired carrier the composite power is ≤ +30 dBc
Absolute Maximum +20 dBm
Acquisition Range Programmable in 1kHz increments
Below 64 ksymbols/sec ± 1 kHz to ± (Rs/2) kHz, where Rs = symbol rate in ksymbols/sec
Between 64 and 389 ksymbols/sec ± 1 kHz to ± 32 kHz
Above 389 ksymbols/sec ± 1 kHz to ± (0.1 * Rs) kHz, up to a maximum of ± 300 kHz
Acquisition Time Highly dependent on data rate, FEC rate, and demodulator acquisition range.
E.g. 120 ms average at 64 kbps, R1/2 QPSK, ± 10 kHz acquisition sweep range, 6 dB Eb/No
Plesiochronous/Doppler Buffer Selectable from 64 to 262,144 bits, in 16-bit steps
(Additional limitations for G.704 frame boundaries)
Receive Clock RX satellite, TX terrestrial, external reference
Clock Tracking ± 100 ppm minimum
LNB Reference (10 MHz) Via RX IF center conductor, 10.0 MHz
± 0.06 ppm (with internal reference), selectable on/off,
-3.0 dBm ± 3 dB
LNB Voltage Selectable on/off, 13 VDC, 18 VDC per DiSEq 4.2 at 500 mA maximum
Monitor Functions Eb/N0 estimate, corrected BER, frequency offset, buffer fill state, receive signal level
DoubleTalk Carrier-in-Carrier
Delay Range 0 to 330 ms
Power Spectral Density Ratio
(Interferer to Desired)
BSPK/QPSK/8PSK/8-QAM: –7 dB to +11 dB
16-QAM/16-ARY, 32-ARY: -7 dB to +7 dB
Maximum Symbol Rate Ratio 3:1 (TX:RX or RX:TX)
Eb/No Degradation 0 dB Power Spectral Density Ratio
BPSK/QPSK/OQPSK: 0.3 dB
8-QAM: 0.4 dB
8PSK: 0.5 dB
8-ARY: 0.4 dB
16-QAM: 0.6 dB
16-ARY; 0.6 dB
32-ARY: 0.6 dB
+10 dB power spectral density ratio
Additional 0.3 dB
Satellite Restrictions Satellite in “loop-back” mode (i.e., the transmit station can receive itself)
“Non-processing” satellite (i.e., does not demodulate or remodulate the signal)
Available Options
Hardware 100 – 240 VAC, 120 W AC primary power supply
Hardware -48 VDC, 125 W primary power supply
Hardware 24 VDC, 90 W @ 50°C BUC power supply, AC, 24 VDC or 48 VDC primary power supply
Hardware 48 VDC, 150 W @ 50°C (180 W @ 30°C) BUC power supply, AC or 48 VDC primary power supply
Hardware Packet Processor
FAST 70/140 MHz (in addition to L-Band IF)
FAST 8-QAM/8-ARY modulation
FAST 16-QAM/16-ARY modulation
FAST 32-ARY modulation
FAST Activate DoubleTalk Carrier-in-Carrier Feature
FAST DoubleTalk Carrier-in-Carrier Data Rate (full) – 512 kbps, 1.1 Mbps, 2.5 Mbps, 5 Mbps, 10 Mbps, 15 Mbps, 20 Mbps or 25 Mbps
FAST DoubleTalk Carrier-in-Carrier Data Rate (fractional) – 2.5 Mbps, 5 Mbps, 10 Mbps, 15 Mbps, 20 Mbps or 25 Mbps
FAST D&I / D&I++ for single Port T1/E1
FAST D&I++ For Quad E1 Port 2, 3 and 4
FAST Quality of Service (requires Packet Processor)
FAST Header Compression (requires Packet Processor)
FAST Payload Compression (requires Packet processor)
FAST Advanced Network Timing (IEEE 1588v2 PTP)
FAST Carrier ID
FAST VersaFEC Codec data rate (CCM) – 2.5 Mbps, 5 Mbps, 16 Mbps
FAST VersaFEC Codec symbol rate (ACM) – 1.2 Msps, 4.1 Msps
FAST VersaFEC-2 Codec data rate (CCM) – 10 Mbps, 15 Mbps, 20 Mbps or 25 Mbps
FAST VersaFEC-2 Codec symbol rate (ACM) – 2.0 Msps, 4.1 Msps, 8.0 Msps or 12.5 Msps
Accessories
CRS-170A 1:1 Modem Redundancy Switch (L-Band)
CRS-180 1:1 Modem Redundancy Switch (70/140 MHz)
CRS-300 1:10 Modem Redundancy Switch
(Not available with Packet Processor)
CRS-280 1:10 IF Redundancy Switch (70/140 MHz)
CRS-280L 1:10 IF Redundancy Switch (L-Band)
CRS-500 1:N Modem Redundancy System
(For use with Packet Processor Only)
CRS-282XXX 1:10 IF Redundancy Switch
(For use with CRS-500)
Environmental and Physical
Temperature Operating: 0 to 50°C (32 to 122°F)
Storage: -40 to 85°C (-40 to 185°F)
Humidity 95% maximum, non-condensing
Power Supply 100 – 240 VAC, +6%/-10%, 50/60 Hz, auto sensing -48 VDC (HW option)
Dimensions (1RU)
(height x width x depth)
1.75” x 19.0” x 14”
(4.4 x 48 x 35.5 cm) approximately
Weight 8.8 lbs (3.9 kg) maximum, with Packet Processor module and 48 VDC BUC power supply installed
CE Mark EN 301 489-1 (ERM)
EN55022 (Emissions)
EN55024 (Immunity)
EN 61000‐3‐2
EN 61000‐3‐3
EN60950 (Safety)
FCC FCC Part 15, Subpart B

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