| 摘要 |
PURPOSE:To obtain the local area network in which the transmission of erroneous data is prevented and a disadvantage of sharing of a specific line over a transmission line for a long time is avoided. CONSTITUTION:Plural lines are connected to transmission lines A, A1, A2 via interface sections C-H respectively. Each of the interface sections C-H is provided with a means discriminating whether or not a reception data is sent from a predetermined line and a means invalidating the reception data when the result of discrimination of the means indicates negative discrimination. |
