VSATplus International Inc.

Comtech EF Data CDM-625A-EN Advanced Satellite Modem

Not Specified

L-Band Modems

Comtech EF Data

COMTECH CDM-625A-EN ADVANCED SATELLITE MODEM The CDM-625A-EN Advanced Satellite Modem builds on a legacy of providing the most efficient satellite modems. With support for VersaFEC® Forward Error Correction (FEC), the revolutionary DoubleTalk® Carrier-in-Carrier® bandwidth compression, additional rolloffs and advanced packet processing, the CDM-625A provides significant savings under all conditions. This...
Add to wishlist

COMTECH CDM-625A-EN ADVANCED SATELLITE MODEM

The CDM-625A-EN Advanced Satellite Modem builds on a legacy of providing the most efficient satellite modems. With support for VersaFEC® Forward Error Correction (FEC), the revolutionary DoubleTalk® Carrier-in-Carrier® bandwidth compression, additional rolloffs and advanced packet processing, the CDM-625A provides significant savings under all conditions. 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

CDM-625A-EN TYPICAL USERS

  • Mobile Network Operators
  • Telecom Operators
  • Satellite Service Providers
  • Government & Military
  • Enterprise
  • Offshore

COMMON APPLICATIONS

  • Mobile Backhaul
  • G.703 Trunking
  • IP Trunking
  • Offshore & Maritime Communications
  • Enterprise
  • Communications on-the-Move
  • Satellite News Gathering

FEATURES

  • DoubleTalk Carrier-in-Carrier bandwidth compression
  • Carrier-in-Carrier Automatic Power Control
  • VersaFEC FEC with Adaptive Coding and Modulation (ACM)
  • 5%, 10%, 15%, 20%, 25% and 35% Filter Rolloff
  • 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/OQPSK, 8PSK/8-QAM, 16-QAM
  • FEC: Viterbi, Sequential, Concatenated Reed Solomon, TCM, Turbo Product Code (TPC) (IESS-315 Compliant), LDPC Code and VersaFEC (low-latency LDPC)
  • Widest Range of data interfaces: EIA-422/530, V.35, G.703 T1, G.703 E1, G.703 T2, G.703 E2, Quad G.703 E1, ASI, LVDS, HSSI, 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
  • Carrier ID using MetaCarrier® Technology
  • Embedded Distant-end Monitor and Control (EDMAC)
  • Automatic Uplink Power Control (AUPC)
  • Engineering Service Channel (ESC/ESC++)
  • Standard high-stability internal reference (± 6 x 10-8)
  • 5-tap Adaptive Equalizer
  • 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

CDM-625A 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 Frequency 50 – 180 MHz (standard) and 950 – 2250 MHz (option) 100 Hz resolution, independent TX and RX operation
Major Operating Modes
(See User Manual For Details)
Open network, per IESS-308 / 309 / 310 / 314 transparent, closed network per IESS-315
LDPC / TPC Codec (option)
VersaFEC Codec (option) with ACM or Constant Coding & Modulation (CCM) EDMAC Framed with/without AUPC
RS Outer Codec
High rate ESC / Enhanced ESC (ESC++)
Drop & insert (D&I) /Enhanced D&I++ (option)
Quad E1 drop & insert (QDI) (option)
DoubleTalk Carrier-in-Carrier (option)
FEC & Modulation
None Uncoded BPSK/QPSK/OQPSK
Viterbi: k=7, per IESS-308/309 Rate 1/2 BPSK/QPSK/OQPSK
Rate 3/4 QPSK/OQPSK
Rate 7/8 QPSK/OQPSK
Viterbi with Reed Solomon Rate 3/4 16-QAM
Rate 7/8 16-QAM
Sequential See CDM-625A user manual for details
Reed Solomon Open network and closed network modes
TCM (Per IESS-310) 8PSK/TCM Rate 2/3
Integrated LDPC and TPC (2nd Gen) Codec (Optional Plug-in Module) LDPC Code Rates
Rate 1/2 BPSK/QPSK/OQPSK
Rate 2/3 QPSK/OQPSK/8PSK/8-QAM
Rate 3/4 QPSK/OQPSK/8PSK/8-QAM/16-QAM
TPC Code Rates
Rate 5/16 BPSK
Rate 21/44 BPSK/QPSK/OQPSK
Rate 3/4 QPSK/OQPSK/8PSK/8-QAM/16-QAM
Rate 7/8 QPSK/OQPSK/8PSK/8-QAM/16-QAM
Rate 0.95 QPSK/OQPSK/8PSK/8-QAM
VersaFEC Codec (Option) 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 (Option) 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-QARY Rate 0.521, 0.537, 0.562, 0.586, 0.611, 0.635, 0.660, 0.684, 0.708, 0.733
16-QARY 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

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-QARY Rate 0.521, 0.537, 0.562, 0.586, 0.611, 0.635, 0.660, 0.684, 0.708, 0.733
16-QARY 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 IDR Mode, no RS, - per ITU V.35 (Intelsat variant)
IBS mode, no RS - per IESS-309, externally frame synchronized
Transparent Closed Network mode, no RS or Turbo coding - per ITU V.35 (Intelsat variant)
EDMAC mode, no RS coding - externally frame synchronized - proprietary
Turbo Product Code/LDPC/VersaFEC modes - externally frame synchronized - proprietary
All RS modes - externally frame synchronized per IESS-308/309/310
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, open network backward 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)
LVDS Serial , Up to 25 Mbps 25-pin D-sub (female)
HSSI Serial , Up to 25 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 T2, 6.312 Mbps (Unbalanced 75 Ω or balanced 110 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)
G.703 E2, 8.448 Mbps (Unbalanced 75 Ω) 9-pin D-sub (female) or BNC (female)
ASI , Up to 25 Mbps BNC (female)
Additional 2.048 Mbps E1 Ports for Quad-E1 (Balanced 120 Ω) 9-pin D-sub (female)
Overhead Data 44-pin High-density D-sub (male)
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 Per IESS-308
Alpha (Rolloff) 5%, 10%, 15%, 20%, 25%, 35%
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 (dB/Hz - Freq. Offset)
< 0.480° rms double sided, 100 Hz to 1 MHz
(Minimum 16 dB better overall than the Intelsat 
IESS-308/309 requirements)
-63.0 dB/Hz - 100 Hz
-73.0 dB/Hz - 1 kHz
-83.0 dB/Hz - 10 kHz
-93.0 dB/Hz - 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:
± 0.7 dB over frequency, data rate, modulation type and temperature range of 15 to 35° C
± 1.0 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, 19 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: 94 – 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
950-2250 MHz: 102 – 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
Adaptive Equalizer 5-tap design, selectable on/off
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 ± 200 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 and 24 VDC 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: -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)
Environmental and Physical
Temperature Operating: 0 to 50°C (32 to 122°F)
Storage: -25 to 85°C (-13 to 185°F)
Power Supply 100 – 240 VAC, +6%/-10%, 50/60 Hz, auto sensing
-24 VDC (HW option) -48 VDC (HW option)
Dimensions (1RU) (height x width x depth) 1.75” x 19.0” x 17.65” (4.4 x 48 x 44.8 cm) approximate
Weight 10.8 lbs (4.9 kg) maximum, with all option modules 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

Returns Policy

You may return most new, unopened items within 30 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).

You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).

If you need to return an item, simply login to your account, view the order using the 'Complete Orders' link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.

Shipping

We can ship to virtually any address in the world. Note that there are restrictions on some products, and some products cannot be shipped to international destinations.

When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.

Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.

Recently Viewed Products