Mocomtech CDM-QX - Manual (Page 26)

CDM-Qx/QxL Multi-Channel Satellite Modem with DoubleTalk™ Carrier-in-Carrier® Revision 7
Introduction MN/CDMQx.IOM
1–2
o Up to 1:3 modulator
o Up to 1:3 demodulator
• EIA-422/-530, V.35, G.703 (T1/E1/E2) 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
o Optional, 2 nd 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;
• Embedded Distant-end Monitor and Control (EDMAC) (see Note)
• Automatic Uplink Power Control (AUPC)
Refer to Sect. 1.3 for in-depth product information and Sect. 1.5 for the CDM-Qx/QxL Summary of
Specifications.
1.1.2 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 (United 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.
1.1.3 Turbo Product Coding
The CDM-Qx/QxL offers optional 2nd generation Turbo Product Codec (TPC). TPC
simultaneously offers increased coding gain, lower decoding delay, and significant bandwidth
savings. The TPC provides:
• BPSK 5/16 and 21/44
• QPSK 21/44, 3/4, 7/8 and 17/18
• 8-PSK 3/4, 7/8, and 17/18
• 16QAM 3/4 and 7/8