It is named "TXN" because of the call sign of TV Tokyo, its key station, JOTX-DTV.

First of all, the former was initially based on TV Asahi, but the Chunichi Shimbun invests in the principle of eliminating concentration.

Chukyo TV subsequently joined NNN in April 1973, then NNS and became a full Nippon Television affiliated station, but until the opening of TV Aichi in 1983, partly with three other wide-area stations (Chubu Nippon Broadcasting, Tokai Television, Nagoya Television), TV Tokyo were broadcast in the form of program sales.

Next, the latter was mainly NET after the establishment of the Federation of Five Companies in 1960, but in 1968 the Japan Science and Technology Foundation fell into a management crisis.

Although "Mega TON" initially stood for "Megalopolis Tokyo-Osaka Network", the "N" also meant Nagoya, where a third station was planned.

However, the name Mega TON Network continued to be used, as it also meant "T" for Takamatsu and "O" for Okayama, after their resepctive capitals.

At the same time as the birth of the new network, the popular name "TX" was officially established as an abbreviation (derived from TV Tokyo's call sign JOTX-TV).

TXN is difficult to expand nationwide, especially in the seven prefectures of Miyagi, Niigata, Shizuoka, Kyoto, Hyogo, Hiroshima, and Kumamoto, which have ordinance-designated cities,[clarification needed] and even now there are no affiliated stations.

You can receive TV Osaka directly or rebroadcast outside the area, and TV Setouchi can be used for direct reception in the western part of Kobe City, but in other areas it is impossible to receive the broadcasts of TXN affiliated stations.

At the president's regular press conference on May 31, 2007, the goal was to complete the transition to digital terrestrial broadcasting on July 24, 2011: However, this was an example commented by Sadahiko Sugaya, the president of TV Tokyo at the time, and was not officially approved as a business plan.

In an overview of the 40th Annual General Meeting of Shareholders on TV Tokyo held on June 20, 2008, the company responded that it was "difficult in the current business environment" regarding the expansion of the area that can be seen, and since then it has not shown any new movements.

Many households are watching TXN affiliated broadcasting stations, by methods such as spillover reception.

However, due to sluggish sales due to economic deterioration in Hokkaido such as the collapse of the bubble economy, the cost of installing relay stations weighed heavily, and in 1998 the Ministry of Posts and Telecommunications at the time decided to shift to terrestrial digital broadcasting.

Even after that, the area expansion did not materialize until 2010, when the system of the "relay station development support project accompanying the transition to terrestrial digital broadcasting" (hereinafter referred to as the support scheme) under the jurisdiction of the Ministry of Internal Affairs and Communications was established.

Due to this effect, for example, in Obihiro and Kushiro, before the transmission stations opened in 2011, they were forced to obtain indirect reception via cable television.

Broadcasting began in most areas of the Soya General Promotion Bureau, including Wakkanai, and the Nemuro Promotion Bureau, which had been unviewable until the end, began broadcasting in December 2015 Although some unopened relay stations (Honbetsu and Honbetsuzawa) remain, the entire Hokkaido network has finally been practically completed 26 years after its opening in 1989.

In addition, due to restrictions on terrestrial digital broadcasting on CATV (in principle prohibiting rebroadcasting outside the area), it is possible that program sales to non-TXN affiliated broadcasting stations, which had been on a downward trend due to that, will increase, so for TXN affiliated stations There is also a point that income from number sales increases and there is a big merit.

With almost no broadcast, the ratio of terrestrial programs has fallen from the initial 70% to less than 50%, and the ratio of original programs (including joint production with TV Tokyo), foreign dramas, and TV shopping is increasing.