основной (оптический) путь
Волоконная линия между точкой S передающего оборудования и точкой R приемного оборудования. Основной путь не включает в себя никаких дополнительных путей (МСЭ-Т Q.1741).
[http://www.iks-media.ru/glossary/index.html?glossid=2400324]
Англо-русский словарь нормативно-технической терминологии. academic.ru. 2015.
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