| 摘要 |
PURPOSE:To detect simply an ineffective packet, by reading a transmitted address added to the packet and collating it with the state of each station. CONSTITUTION:Stations 2-7 are connected to a transmission line of loop form. An address is given to each station. A monitor SV1 detects and deletes ineffective packets which exist on the transmission line and are not assigned. The monitor is provided with an address table which records whether or not each station receives a packet. The monitoring device reads the address to be transmitted for the packet transmitted on the transmission line and compares it with the data in the address table. The packet having no correspondence possible for reception is made ineffective. Since the monitoring device monitors the address to be transmitted in the packet only, the monitoring device makes normal operation independently of the content of the packet. |
