| 摘要 |
According to one embodiment, a monitor/control unit of an electronic circuit board monitors the receiving state of a transmitting/receiving circuit unit and controls a parameter setting unit, causing the same to change the reception parameter of the transmitting/receiving circuit unit, and if the receiving state remains not changed to a specified state, the monitor/control unit informs a host control device of this fact. The host control device instructs the switching process board to designate a channel, thereby to change, the specified state, the receiving sate of the electronic circuit board associated with the channel informed of that fact. |
