TDT was the first digital-only commercial channel in Australia. TDT's effect on the digital television market in Tasmania was widely anticipated, as success or failure would strongly guide the digital plans of other broadcasters.
As part of the joint venture, Southern Cross Broadcasting is responsible for handling playout (from their Canberra facility), and transmits this signal via satellite to WIN Television transmission facilities in Tasmania. WIN Television handle the business administration and advertising sales for TDT.
In May 2016, WIN Television announced it was taking up a Network Ten affiliation across its stations from 1 July 2016, affecting its Tasmanian station TVT. With TDT's number two rating Ten content being taken by WIN, the Nine Network would have to sign a new deal with TDT to ensure its content continued to be seen by Tasmanians. Following intense negotiations which lasted until the last day, 30 June, a deal was made for TDT to become a Nine Network affiliate. As a result, TDT Nine rebroadcasts the Nine Melbourne feed supplemented with local advertising.
Following significant public speculation about how programming would be carried by the new station, one of two options were suggested: Southern Cross would drop one of its affiliations (either Seven or Ten) and TDT would pick it up; or TDT would also become a dual Seven and Ten affiliate, and carry the programs that Southern Cross opted not to broadcast.
Southern Cross did not want to disrupt its existing market-leading program line-up, so the agreement TDT signed with Ten allowed Southern Cross to have 'first pick' of Ten programming. If both networks wanted to broadcast a program, Southern Cross had to broadcast it at the same time as TDT. If Southern Cross wanted to broadcast a Ten program at a different time, TDT would usually broadcast an alternative program. Examples of this included Thank God You're Here, The Bold and the Beautiful, and The Wedge. Huey's Cooking Adventures was an exception, with both networks screening it at different times.
From its initial broadcast in late December 2003, to late January 2004, TDT showed a direct feed of ATV-10 in Melbourne. As access to the TDT Ten broadcast gradually spread across the state in the following years, Southern Cross agreed to progressively drop Ten programs from its line-up. Southern Cross dropped Rove Live and Totally Wild in 2004, Big Brother in 2006, The Bold and the Beautiful in 2007, Huey's Cooking Adventures, Australian Idol and Thank God You're Here in 2008 (though it returned in 2009 with the program's move to Seven), and Neighbours and The Simpsons in 2009. In 2009, the only Ten content broadcast by Southern Cross was AFL.
During the AFL season, TDT simulcast the Ten News Melbourne bulletin (presented by George Donikian and broadcast to Melbourne, Adelaide and Perth) on Saturday nights at 6:00pm which complemented Ten's Saturday AFL coverage. On Sundays, Ten's national bulletin presented by Natarsha Belling from Sydney was broadcast.
In 2012, the station began airing short local news updates, produced from Southern Cross Austereo's studio in Canberra, rather than either TNT or TVT's studio. The segments draw on the resources of Southern Cross Austereo.
As a Nine Network affiliate, TDT simulcasts the hour-long Nine News Melbourne from GTV-9 presented weekdays by Peter Hitchener as well as their weekend bulletins.
TDT is simulcast in digital standard definition and 1080p high definition (9HD). TDT is broadcast in most areas across Tasmania. TDT is an affiliate of Nine Network and carries their branding and most programs.