Switching system of stored program control type

A telephone switching system of the stored program control type comprising a calling line identifier for identifying the position of a calling subscriber on the switching network and a called line busy status detector for detecting the free or busy status of a called line designated by a central con...

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Bibliographic Details
Main Authors SHIRASU; HIROTOSHI, USUDA; HIROTAKA
Format Patent
LanguageEnglish
Published 29.06.1976
Subjects
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
SELECTING
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Summary:A telephone switching system of the stored program control type comprising a calling line identifier for identifying the position of a calling subscriber on the switching network and a called line busy status detector for detecting the free or busy status of a called line designated by a central controller. The central controller reads and utilizes the information identified and detected by the above-mentioned two devices respectively, thereby to eliminate the need for memories in the central controller to store the status of all subscribers' lines.
Bibliography:Application Number: US19740474024