OPTICAL MULTI-DISTRIBUTION COMMUNICATION SYSTEM, MASTER STATION UNIT AND SLAVE STATION UNIT USED FOR IT, AND MEHTOD FOR CONTROLLING OPTICAL MULTI-DISTRIBUTION COMMUNICATION BAND

摘要

PROBLEM TO BE SOLVED: To provide an optical multi-distribution communication system that can further enhance the transmission efficiency of transmission information sent from slave stations to a master station.;SOLUTION: Each of slave stations 20-1-20-3 is provided with a detection section 26 that detects whether or not the information amount in a buffer 25 is a prescribed threshold or over and informs a PT(Payload Type) revision section 24 about the result of detection and with the PT revision section 24 that changes a PT in an ATM header of an ATM cell read from the buffer 25 when receiving the information denoting that the buffer amount is the prescribed threshold or over from the detection section 26. The master station 10 is provided with a PT extract section 13 that extracts the PT in the ATM cell and a shared band assignment section 12 that generates band assignment information for the slave stations 20-1-20-3 to which the ATM cell extracted by the PT extract section 13 is transmitted, and multicasts the band assignment information to the slave stations 20-1-20-3 to apply band assignment control to the slave stations 20-1-20-3.;COPYRIGHT: (C)2002,JPO