composite triple beat

I read some papers about CATV and wish to find the clear definition about the cncept of composite triple beat(CST). could anyone give me any help? Thanks in advance.

I don’t know what means CST! The terminology is CTB – Composite Triple Beat, or CSO – Composite Second Order beat.
CTB are the third-order distortion products of the visual carrier measured as the ratio of the peak value of the carrier to the peak of the average value of the distortion products.
This document shows how to measure CTB and CSO:
http://www.eetasia.com/ARTICLES/2003..._NTES_AN06.PDF