| 摘要 |
PROBLEM TO BE SOLVED: To turn a line adapter(LA) under the control of a control processor(COP) into operable state without turning off the power source of a system while unnecessitating the exchange of a board even when any fault occurs in the LA. SOLUTION: Concerning the communication control unit with plural packaged function boards, a board for COP, a board for LA and a backboard for packaging the respective boards are provided as these boards, the backboard is provided with a matrix switch circuit for switching a connection with the respective boards and a switch control circuit connected to a host for controlling the matrix switch circuit, and the matrix switch circuit comprises a matrix for switching the board for COP and plural boards for LA controlled by the board for COP.
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