Comtech EF Data CDM-625-EN Advanced Satellite Modem with IP Data Encryption
Advanced Satellite Modem with encryption, variable rate from 18 Kbps to 25 Mbps
CDM-625-EN Advanced LDPC Satellite Modem
The Comtech CDM-625-EN Advanced Satellite Modem builds on Comtech EF Data’s legacy of providing the most efficient satellite modems. It is the first modem to combine advanced Forward Error Correction (FEC) such as VersaFEC, Low Density Parity Check (LDPC) codes with the revolutionary DoubleTalk Carrier-in-Carrier bandwidth compression, allowing for maximum 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-625-EN Features
- DoubleTalk Carrier-in-Carrier bandwidth compression
- Carrier-in-Carrier Automatic Power Control
- Adaptive Coding and Modulation (ACM) • Packet Processor with header compression, payload compression, advanced Quality of Service (QoS) and Managed Switch Mode
- 4-port managed Ethernet switch with VLAN and QoS
- Jumbo frame support • Dual Band Capability: 70/140 MHz and L-Band 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
- 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: Advanced FSK for LPOD M&C
- L-Band RX: 10 MHz reference and LNB power supply
- Open network modes
- 1:1 and 1:10 redundancy switches available
SpecificationsData Rate 18 kbps to 25 Mbps, in 1 bps steps (modulation, FEC & data interface dependant) |
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Symbol Rate |
18 ksps to 12.5 Msps |
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Operating Frequency |
50 – 180 MHz (standard) and 950 – 2000 MHz (Option), 100 Hz resolution, independent TX and RX operation |
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Major Operating |
Open network, per IESS-308 / 309 / 310 / 314 |
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Modes |
transparent, closed network per IESS-315 |
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(See User |
LDPC / TPC Codec (optional plug-in module) |
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Manual For |
VersaFEC Codec (optional plug-in module) with |
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Details) |
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++ Quad E1 drop & insert (QDI) DoubleTalk Carrier-in-Carrier (optional plug-in module) |
FEC Options |
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None |
Uncoded BPSK/QPSK/OQPSK |
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Viterbi: k=7, per IESS-308/309 |
Rate 1/2 BPSK/QPSK/OQPSK Rate 3/4 QPSK/OQPSK Rate 7/8 QPSK/OQPSK |
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Viterbi with Reed Solomon |
Rate 3/4 16-QAM Rate 7/8 16-QAM |
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Sequential |
See CDM-625 user manual for details |
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Reed Solomon |
Open network and closed network modes |
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TCM (Per IESS-310) |
8PSK/TCM Rate 2/3 |
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Integrated LDPC |
LDPC Code Rates |
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and TPC (2nd |
Rate 1/2 BPSK/QPSK/OQPSK |
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Gen) Codec |
Rate 2/3 QPSK/OQPSK/8PSK/8-QAM |
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(Optional Plug-in |
Rate 3/4 QPSK/OQPSK/8PSK/8-QAM/16-QAM |
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Module) |
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 |
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VersaFEC Codec |
BPSK Rate 0.488 |
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(Optional Plug-in |
QPSK Rate 0.533, 0.631, 0.706, 0.803 |
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Module) |
8-QAM Rate 0.576 (ECCM), 0.642, 0.711, 0.780 |
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16-QAM Rate 0.644 (ECCM), 0.731, 0.780, 0.829, |
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0.853 |
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BPSK 0.493 (ULL) |
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QPSK 0.493, 0.654, 0.734 (ULL) |
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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 |
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Management |
10/100Base-T Ethernet with SNMP, HTTP and Telnet support, EIA-232, EIA-485 (2- or 4-wire) |
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Form C Relays |
Hardware fault, RX and TX traffic alarms, open network backward alarms |
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External |
BNC connector |
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Reference |
Input: 1, 2, 5, or 10 MHz, -6 dBm to |
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(Input OR Output) |
+10 dBm, 50 _/75 _ (nominal) Output: 10 MHz, 2.7 V peak-to-peak ± 0.4 V, low impedance output |
Common Applications
• Mobile Backhaul
• G.703 Trunking
• IP Trunking
• Offshore & Maritime Communications
• Enterprise
• Communications on the Move
• Satellite News Gathering
