all trunks busy

См. также в других словарях:

• 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

• Reorder tone — The reorder tone, also known as the fast busy tone, is the congestion tone or all trunks busy (ATB) tone of a public switched telephone network. It varies from country to country; in the USA it is a dual frequency tone of 480 Hz and 620 Hz at a… …   Wikipedia

• Toll-free telephone number — A toll free, Freecall, Freephone, or 800 number is a special telephone number, in that the called party is charged the cost of the calls by the telephone carrier, instead of the calling party. The cost of the call to the called party is usually… …   Wikipedia

• 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

• ATB — [1] Advanced Technology Bomber (stealth Bomber) [2] All Trunks Busy [3] Atbara, Sudan internationale Fughafen Kennung …   Acronyms von A bis Z

• ATB —    See all trunks busy …   IT glossary of terms, acronyms and abbreviations

• Number Five Crossbar Switching System — The Number Five Crossbar Switching System or 5XB switch, designed by Bell Labs and made by Western Electric, was in use in Bell System telephone exchanges from 1948 to the 1980s. Its principal use was as a Class 5 telephone switch, though… …   Wikipedia

• Panel switch — The panel switching system was an early type of automatic telephone exchange, first put into urban service by the Bell System in the 1920s and removed during the 1970s. The Panel and Rotary systems were developed in parallel by Bell Labs before… …   Wikipedia

• 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