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Common Path Distortion, or CPD, is one of the dominant interfering signals in a broadband cable television system's return path.[1] It is produced by the mixing of cable system RF carriers at a point in the plant where both forward and reverse RF carriers are present-- for example, at plant devices such as taps, terminators, connectors, and seizure screws. [2] Since there are typically many more forward path carriers than reverse path carriers on a cable system, CPD results primarily from mixing of system forward path RF carriers. [3] As such, it consists of the harmonic and intermodulation products indicated in the definitions of the two most significant forward path distortions, Common Path Distortion (CSO) and Composite Triple Beat (CTB).
- ^ Cicora, Walter; Farmer, James; Large, David; Adams, Michael (2004). Modern Cable Television Technology, Morgan Kaufmann Publishers, 676.
- ^ Romanick, Nick, "A Primer on Common Path Distortion." Communications Technology, April 2001
- ^ Communications Technology Common Path Distortion