Circuit reservation system of key telephone set

Abstract

Abstract PURPOSE:To make it possible to offer circuit reservation service with efficiency by acquiring an external circuit only in a certain time until a telephone set sends an outgoing signal when the external circuit is not engaged with the external circuit selection button of the telephone set operated. CONSTITUTION:Main control unit MCU is equipped with a processor and office units SLU1-SLUm that are equipped with processors well as have the functions of connecting with an external circuit. Further, terminal units TEU1-TEUn are also equipped with processors and connected to key telephone sets MFT1-MFTn through voice circuits VL1-VLn and data circuits DL1-DLn. Then, when the external circuit is not engaged in case that external circuit selection buttons, not shown in the figure, of those telephone sets MFT1-MFTn are operated, the external circuit is acquired only in a certain time until telephone sets MFT1 and MFT2 send originating signals. Consequently, the circuit reservation service can be offered with efficiency.

Inventors

• 👤 Kiyoshi Shikayama
• 👤 Hiroshi Kitazono
• 👤 Senji Okumura
• 👤 Junzo Kikuchi
• 👤 Masateru Kuroda

Bibliographic Details