CDM‑Qx and CDM-QxL offer the DoubleTalk® Carrier‑in‑Carrier® bandwidth compression capability that allows transmit and receive carriers of a full‑duplex satellite link to share the same transponder space.

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

Product Specifications

• DoubleTalk Carrier‑in‑Carrier bandwidth compression
• Four slot chassis, allowing flexible configuration
• CDM‑Qx: 50 to 90, 100 to 180 MHz
  CDM‑QxL: 950 to 1950 MHz
• Data Rate: 32 kbps to 20 Mbps
• Modulation: BPSK, QPSK, 8‑PSK and 16‑QAM
• Forward Error Correction (FEC): Viterbi, Concatenated Reed Solomon and Turbo Product Coding (IESS‑315 Compliant)
• Data Interface: EIA‑422, V.35, Sync EIA‑232, G.703 T1, G.703 E1, Quad G.703 E1, G.703 E2 and HSSI
• Enhanced D&I++ for Single & Quad E1
• M&C: EIA‑232, EIA‑485, and 10/100 BaseT Ethernet with SNMP, HTTP and Telnet support
• Embedded Distant‑end Monitor and Control (EDMAC)
• Automatic Uplink Power Control (AUPC)
• Spectrum Analyzer Function
• Asymmetric Loop Timing
• Common frequency reference for all modules
• Individual modulator output power control
• CDM-QxL: 10 MHz reference for BUC, FSK communications and optional BUC power supply
• CDM-QxL: 10 MHz reference and LNB power supply
• Interoperable with many Comtech EF Data satellite modems: CDM‑550T, 570, 570L, 600, 600L, SDM‑8000, 300A, and 300L3

Typical Users

• Satellite Service Providers
• Fixed Line Operators
• Service Providers
• Government & Military
• Enterprise
• Oil Field Service Providers

• Cellular Backhaul
• High Speed Trunking
• Offshore Communications
• Limited Rack Space Installations