Comtech EF Data CDM-750 - Manual (Page 264)

CDM-750 Advanced High-Speed Trunking Modem Revision 2
Appendix D MN-CDM750
D–6
Composite
Carrier 2
Carrier 1
Carrier 1 Carrier 2
Figure D-3. Same Link Using CDM-750 and DoubleTalk Carrier-in-Carrier
Traditional Full Duplex Link Duplex Link with DoubleTalk Carrier-in-Carrier
Figure D-4. Duplex Link Optimization
The CDM‐750 CnC module operates on the near‐zero signal before the demodulator, and is
waveform agnostic. This means that no prior knowledge of the underlying modulation, FEC, or
any other waveform specific parameter is required in order to perform the signal cancellation
operation. The only caveat to this is that the waveform must be sufficiently random.