A Atlantic is a Canadian English language cable television channel serving Atlantic Canada owned by CTVglobemedia, with its studios located in Halifax, Nova Scotia. It is part of CTVglobemedia's secondary A television system. The channel launched as the Atlantic Satellite Network (or ASN) in 1983.

It is designated by the Canadian Radio-television and Telecommunications Commission (CRTC) as a "satellite-to-cable television programming undertaking," defined as a local television channel available in the region on basic cable television, and now throughout Canada on many digital cable systems and satellite television, but without any terrestrial transmitters. (A small number of other channels, mainly educational broadcasters, are similarly designated.) Although the channel does not have mandatory cable carriage rights, nearly all cable systems in the region offer it. Nonetheless, it has full simultaneous substitution rights in the Atlantic provinces, whereas most non-broadcast channels do not.

Prior to fall 2008, the channel had received much of its programming from CHUM's Citytv and A-Channel (now A) systems, which did not operate in the region; beginning in the early 2000s, timeshifted CTV programs often aired on the channel as well. CTV acquired CHUM (excluding Citytv) in 2007, and ASN merged with the relaunched A system on August 11, 2008. Numerous cable-only network affiliates exist in the United States, particularly in conjunction with The CW Plus, although A Atlantic is the only station of this type currently operating in Canada.

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