GATINEAU, Que. — Asian Television Network International Ltd. was one of a number of ethnic broadcasters with Category A third-language channels who on Thursday urged the CRTC, as part of the regulator’s two-week hearing on the future of television, to maintain its buy-through requirement for those channels. The CRTC said in a discussion document issued in August that it is considering eliminating the current rule, under which consumers must subscribe to "Fairchild TV,...