Main line - Main line

Japanese: 基幹回線 - きかんかいせん

…The general offices (8 offices), central offices (about 80 offices), and toll offices (about 560 offices) are long-distance relay exchanges, and telephone sets are accommodated in terminal offices (about 5,000 offices). The network is made up of a star-shaped network, which is called the backbone network. However, the top-level general offices are connected by a mesh network. …

From [Telecommunications Network]

...This network is called a hierarchical star network because it is stacked in a star shape. In addition, because this star network is the base of the communication network, its relay circuits are called backbone circuits. Relay exchanges such as toll stations, central stations, and general stations each have the function of collecting relay circuits from lower levels and forming them into large groups, thereby increasing the efficiency of the use of transmission lines. However, in relay sections where there is originally a lot of inter-station traffic, the need for this decreases due to the saturation characteristics of the large group effect. ...

*Some of the terminology used to refer to "backbone lines" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…総括局(8局)，中心局(約80局)，集中局(約560局)は市外中継交換局であり，電話機は端局(約5000局)に収容されている。回線網は星状回線網で構成されており，これを基幹回線という。ただし最上位の総括局間は網状回線網で結合されている。…

【電気通信網】より

…この回線網は星状に積み上げられた形態をなしていることから階層構成の星状回線網という。また，この星状回線網は通信網のベースになることからその中継回線を基幹回線と呼んでいる。集中局，中心局，総括局などの中継交換機はそれぞれ下位からの中継回線を集めて大群化を行い，伝送路の使用効率を高める機能をもっているが，局間トラヒックがもともと多い中継区間では大群化効果の飽和特性によってその必要性は少なくなってくる。…

※「基幹回線」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典第２版について | 情報

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