DIGITAL NETWORK WITH MECHANISM PUTTING TOGETHER VIRTUAL MESSAGE TRANSFER PATHS HAVING CLOSE TRANSFER SERVICE RATES TO IMPROVE EFFICIENCY OF TRANSFER SCHEDULING ONTO VIRTUAL MESSAGE TRANSFER PATH

摘要

PROBLEM TO BE SOLVED: To improve the efficiency of transfer scheduling of a digital network by using a queue system for transfer of information in a cell form, classifying service rates in stages, and gathering and transmitting cells by paths according to the extent of a service rate. SOLUTION: In an output module, a connection grouping unit 42 classifies cells received by an input FIFO buffer 37 into groups of queues matching the schedule of transmission and holds them in a storage part 34. When cells are taken out by an output section 35, a control section 36 takes out a queue matching a connection state so as to maintain the guarantee lowest value of a service rate corresponding to the state of a direct connection to each group of the queue. At this time. a schedule unit 43 selects an entry in a group table, calculates a proper start time and an end time from connection information when the entry is effective, and selects them in respectively suitable groups.