| 摘要 |
PURPOSE: A communication bus structure of an ISDN subscriber block is provided so as to avoid mutual influence between adjacent boards or adjacent channel by achieving a mutual communication using an associated channel bus only, in case that a subscriber's seizure is generated. CONSTITUTION: Each of the logic circuit parts(120,220) are installed inside of a subscriber control board(100) and a subscriber board(200) for communication between the subscriber control board(100) and the subscriber board(200). A first logic part(120) of the subscriber control board(100) is composed of a plurality of parallel/serial conversion boards and a digital line concentrator. The multiple parallel/serial conversion boards converts parallel data into serial data each channel by channel, corresponding to each of the subscriber boards(B0-B15)(200). The digital line concentrator concentrates serial data of each of the subscriber boards and switches associated channel by channel.
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