when did the aforementioned channel start telecasting programmes?
November 15, 1989
Comedy Central
On November 15, 1989, Time-Life, owners of HBO launched The Comedy Channel as the first cable channel devoted exclusively to comedy-based programming. 
what is south park? It is the thirteenth season of "South Park", an American animated television series. what is it's genre? Comedy which channel did air it? Comedy Central who all have acted in it? UNANSWERABLE who was the protagonist? Stan, Kyle, Cartman, Kenny and Butters does this series refer to any cultural aspects? Yes, The episode "Margaritaville" satirized the global recession, "Fatbeard" was based on real-life piracy in Somalia, "Whale Whores" addressed the controversies surrounding Japanese whaling.
wiki:11708974
Comedy Central [SEP] 1989–1991: Pre-launch as The Comedy Channel
On November 15, 1989, Time-Life, owners of HBO launched The Comedy Channel as the first cable channel devoted exclusively to comedy-based programming. On April 1, 1990, Viacom (who owned MTV, VH1, and Nickelodeon) launched a rival channel called Ha! that featured reruns of situation comedies and some original sketch comedy. The Comedy Channel's programs were broadcast from the HBO Downtown Studios at 120 East 23rd Street in Manhattan. The format prior to the merger with Ha! included several original and unconventional programs such as "Onion World" with Rich Hall and "Mystery Science Theater 3000", as well as laid-back variety/talk shows hosted by comedians, including "The Sweet Life" with Rachel Sweet, "Night After Night with Allan Havey", "Sports Monster", and "The Higgins Boys and Gruber", the latter of whom performed sketches in between showings of vintage television series like "Supercar", "Clutch Cargo", and "Lancelot Link, Secret Chimp".