The CDM-625 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® and 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
The advanced technologies and features of CDM-625 are covered by a number of U.S. patents including 7,254,188, 7,353,444, 7,415,659 and other pending patents.

APPLICATIONS
• Cellular Backhaul
• G.703 Trunking
• IP Trunking
• Offshore & Maritime Communications
• Enterprise
• Communications on-the-Move
• Satellite News Gathering
TYPICAL USERS
• Mobile Operators
• Telecom Operators
• Satellite Service Providers
• Government & Military
• Enterprise
• Offshore
KEY FEATURES
• DoubleTalk Carrier-in-Carrier bandwidth compression
• Adaptive Coding and Modulation (ACM)
• IP Packet Processor with header compression, payload compression and advanced Quality of Service (QoS)
• 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, 8-PSK/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
• 4-port Managed Ethernet Switch with VLAN and QoS
• 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)
• 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
• Open Network Modes
• CDM-600/L emulation mode
• 1:1 and 1:10 redundancy switches available
• Backwards compatible with CDM-500/CDM-550, CDM-550T, CDM-570/L and CDM-600/L Satellite Modems
• Interoperable with many Comtech EF Data Satellite Modems: CDM-Qx/L, SDM-8000, 300A, and 300L3

DoubleTalk Carrier-in-Carrier, based on patented “Adaptive Cancellation” technology, allows transmit and receive carriers of a duplex link to share the same transponder space.