| 摘要 |
PURPOSE: A line board control method in a switching system is provided to simplify design of a backboard and reduce a fabrication cost of the back board by reducing the number of layers of printed circuit board of a backboard by transmitting and receiving various signals wirelessly between a control board and a line board in case that the control board controls a plurality of line boards. CONSTITUTION: A radio transmitting and receiving unit(20) performs a radio communication by a bluetooth and includes an antenna(21), a copper foil(22) and a bluetooth chip(23). The bluetooth chip(23) converts a signal applied from an internal circuit of a circuit board into a radio signal and transmits it through the antenna(21), receives and processes a signal wirelessly applied through the antenna(21) and applies it to the internal circuit of the circuit board. A control board(30) and line boards(40a-40n) respectively include the radio transmitting and receiving unit(20) to transmit to and receive from a signal each other, and the control board controls the plurality of line boards(40a-40n). The radio transmitting and receiving unit(20) provided in the control board(30) is set as a master and the radio transmitting and receiving unit(20) provided in each line board(40a-40n) is set as a slave, so that the radio transmitting and receiving unit(20) of each line board(40a-40n) wirelessly transmits to and receives from the radio transmitting and receiving unit(20) of the control board(30).
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