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CDM-Qx Satellite Modem Revision 5
Introduction MN/CDMQx.IOM
1–3
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.
1.2.2 Software – Flash Upgrading
The internal software is both powerful and flexible, permitting storage and retrieval of up
to 10 different modem configurations. The modem uses ‘flash memory’ technology
internally, and new firmware can be uploaded to the unit from an external PC. This
simplifies software upgrading, and updates can now be sent via the Internet, e-mail, or on
disk. The upgrade can be performed without opening the unit by simply connecting the
modem to the USB port or Ethernet port of a computer.
1.2.3 Verification
The Modem includes many test modes and loopbacks for rapid verification of the correct
functioning of the unit. Of particular interest is the IF loopback, which permits the user to
perform a quick diagnostic test without having to disturb external cabling. During
loopback, all of the receive configuration parameters on the selected Demodulator are
temporarily changed to match those of the selected Modulator, and an internal RF switch
connects the modulator output to the demodulator input. When normal operation is again
selected, all of the previous values are restored.