| 摘要 |
An automatic MDF apparatus for connecting/disconnecting communication between an exchange and user terminals, which comprises a first stage matrix board having a plurality of input/output lines arranged in matrix, a second stage matrix board that includes a plurality of input/output lines arranged in matrix and is perpendicular to the matrix board of the first stage, a third stage matrix board that includes a plurality of input/output lines arranged in matrix and is perpendicular to the matrix board of the second board, and a center board disposed at the position where it provides a sole common junction surface between the first stage matrix board and the second stage matrix board and between the second stage matrix board and the third stage matrix board, wherein the center board is connected to the first, second and third matrix boards by connectors.
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