all trunks busy

(ATB)
   A single tone that is interrupted at 60 ipm rate to indicate a condition when all trunks in a particular group are engaged.

IT glossary of terms, acronyms and abbreviations. . 2015.

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  • занятость всех соединительных линий — — [Л.Г.Суменко. Англо русский словарь по информационным технологиям. М.: ГП ЦНИИС, 2003.] Тематики информационные технологии в целом EN all outlets engagedall trunks busy …   Справочник технического переводчика

  • ATB — • Advanced Technology Bomber (stealth Bomber) • All Trunks Busy • Atbara, Sudan internationale Flughafen Kennung …   Acronyms

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  • Telephone switchboard — PBX switchboard, 1975 A switchboard (also called a manual exchange) was a device used to connect a group of telephones manually to one another or to an outside connection, within and between telephone exchanges or private branch exchanges (PBXs) …   Wikipedia

  • Number One Crossbar Switching System — The Number One Crossbar Switching System, or 1XB switch, was the primary urban local telephone exchange design used by the Bell System in the mid 20th century. Its switch fabric topology was based on the earlier urban panel switch system, which,… …   Wikipedia


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