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CDM-Qx Satellite Modem
Introduction
1.2
Features
The Modem includes such features as the following:
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1.2.1
DoubleTalk™ Carrier-in-Carrier
Designed for bandwidth compression, Carrier-in-Carrier is based on Applied Signal
Technology's DoubleTalk which uses "Adaptive Cancellation," a patented (Unites States
Patent # 6,859,641) technology that allows full duplex satellite links to transmit
concurrently in the same segment of transponder bandwidth. Available as an option to
the modem, this added dimension can result in a significant improvement in satellite
transponder utilization.
DoubleTalk™ Carrier-in-Carrier
link to use the same transponder segment
CDM-Qx: 50 to 90 and 100 to 180 MHz frequency range
CDM-QxL: 950 MHz-1950 MHz L-band
32 kbps to 20 Mbps
BPSK, QPSK, 8-PSK, 16-QAM operation
Flexible Configuration:
o 1 modem or 2 modems configured as 1:1
o Up to 4 demodulators
Optional Built In Redundancy:
o 1:1 modem
o Up to 1:3 modulator
o Up to 1:3 demodulator
EIA-422/-530, V.35, G.703 (E1/T1) and HSSI Interfaces
1 to 4 Ports of G.703 (E1 with D&I ) Quad E1 Interface Card
10/100 BaseT Ethernet, RS-232 or RS-485 for M&C remote control
Forward Error Correction (FEC) choices included:
o Viterbi
o Viterbi with Reed-Solomon
o Trellis and Reed-Solomon
nd
o Optional, 2
Generation Turbo Product Coding (TPC)
(IESS-315 compliant)
Fully Accessible System Topology (FAST)
Asymmetric Loop Timing
Common frequency reference for all modules
Optional High Stability Reference
Optional Redundant Power Supply
Individual or summed Modulator output power control
Interoperable with: CDM-550T, -570L, -600, -600L, SDM-300A, -300L3, and
-8000 modems (in compatible modes)
Drop and Insert, closed network version
EDMAC, Automatic Uplink Power Control
®
allowing Tx and Rx carriers of a full-duplex
®
1–2
Revision 6
MN/CDMQx.IOM
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