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In the world of modern satellite communications, where efficiency, flexibility, and scalability are paramount, the Comtech CDM-625A Advanced Satellite Modem stands out as a robust and innovative solution. Known for its forward-thinking technology and outstanding reliability, the CDM-625A delivers high-performance connectivity that meets the demands of mission-critical applications across a wide range of industries.
At VSATPlus, we are proud to offer the Comtech CDM-625A to clients seeking to enhance their satellite communication infrastructures. Whether you are managing mobile backhaul, enterprise networks, offshore operations, or government and military communication systems, this modem offers the tools to reduce operational costs, increase throughput, and boost link availability—all within a compact and durable chassis.
The CDM-625A builds upon Comtech EF Data’s legacy of performance by integrating cutting-edge technologies such as:
This blend of technologies enables multi-dimensional optimization of satellite resources, allowing users to minimize operating and capital expenditures while maximizing performance.
DoubleTalk Carrier-in-Carrier uses patented Adaptive Cancellation technology to allow transmit and receive signals to occupy the same transponder bandwidth. This effectively halves the space required, enabling significant savings in bandwidth cost or equipment downsizing, such as smaller antennas and lower-powered BUCs.
This intelligent feature allows two modems in a Carrier-in-Carrier link to automatically adjust transmit power based on rain fade conditions. It ensures consistent link quality while optimizing power usage and allowing for margin sharing between sites.
VersaFEC-2 is engineered for optimal performance at low and mid-tier symbol rates, delivering better-than-DVB-S2 performance with reduced latency. The CDM-625A supports both long and short block modes with up to 38 ModCods, offering both constant and adaptive coding and modulation.
The modem supports a vast range of modulation schemes including:
It includes multiple FEC schemes such as Viterbi, Turbo Product Codes (TPC), LDPC, and VersaFEC, enabling maximum flexibility for deployment across various link environments.
With support for 70/140 MHz IF and extended L-band (950–2250 MHz) in a single unit, the modem simplifies spares management and streamlines deployment in networks using mixed IF infrastructure.
The built-in 10/100Base-T Ethernet switch with VLAN and QoS support enables seamless integration into modern IP networks. It also supports jumbo frames, ideal for data-intensive applications.
The optional packet processor enhances IP networking with:
The CDM-625A supports data rates from 18 kbps to 25 Mbps and symbol rates from 18 ksps to 12.5 Msps, enabling scalability from narrowband to broadband applications.
The modem’s IP Sub Multiplexer and Enhanced Drop & Insert (D&I++) allow mixing IP traffic with serial (T1/E1) interfaces, making it a flexible solution for legacy and modern systems.
Redundancy options include 1:1 and 1:10 modem and IF redundancy switches. An environmentally resistant (ER) version of the modem is available for deployment in harsh climates.
The CDM-625A serves a diverse array of sectors, offering unmatched flexibility and performance:
The following table highlights the technical details of the CDM-625A:
| Parameter | Specification |
|---|---|
| Data Rate | 18 kbps to 25 Mbps |
| Symbol Rate | 18 ksps to 12.5 Msps |
| Frequency Range | 50–180 MHz and 950–2250 MHz |
| Modulations Supported | BPSK, QPSK, OQPSK, 8PSK, 8-QAM, 16-QAM, 32-ARY |
| FEC Options | Viterbi, TPC, LDPC, VersaFEC, VersaFEC-2 |
| Roll-Off Factors | 5%, 10%, 15%, 20%, 25%, 35% |
| Interfaces | Ethernet (x4), G.703, HSSI, ASI, EIA-422/530, LVDS |
| Ethernet | Managed 4-Port 10/100Base-T with VLAN/QoS |
| Clock Reference | Internal ±0.06 ppm or external (1, 2, 5, 10 MHz) |
| Output Power Range | 0 to -25 dBm (70/140 MHz), 0 to -40 dBm (L-band) |
| BUC Power Options | 24V @ 90W or 48V @ 150W |
| Management | SNMP, Telnet, HTTP, RADIUS Client, EDMAC, AUPC |
| Environmental Range | Operating: 0 to 50°C, Storage: -40 to 85°C |
| Dimensions | 1.75" H x 19" W x 17.65" D |
| Weight | 10.8 lbs (4.9 kg) max with all options |
| Compliance | CE, FCC Part 15, RoHS, EN55022, EN60950 |
At VSATPlus, we focus on offering leading-edge satellite communications technology backed by technical expertise and responsive customer service. When you purchase the CDM-625A from us, you receive:
✓ Dual-band support in one unit—streamline operations and reduce spares
✓ Integrated managed Ethernet switch—ideal for modern IP infrastructure
✓ Packet processor for compression, QoS, and header optimization
✓ Carrier-in-Carrier for bandwidth and power savings
✓ Versatile FEC and modulation combinations for any deployment
✓ Redundancy-ready for mission-critical networks
✓ Optimized for modern IP and legacy TDM applications
The Comtech CDM-625A Advanced Satellite Modem is a powerful, multi-featured device that caters to the evolving demands of global satellite communication. With its comprehensive list of supported protocols, interfaces, modulation schemes, and advanced compression technologies, it delivers significant advantages in bandwidth efficiency, flexibility, and network optimization.
If your operation demands a reliable, high-performance satellite modem capable of meeting stringent communication needs, look no further than the Comtech CDM-625A available now at VSATPlus. We are your trusted partner in satellite technology, providing the solutions and support to keep your networks connected, efficient, and future-ready.
