Bus line traffic control adapter apparatus

A bus line traffic control adapter apparatus interposed between a service unit and a plurality of data terminals connected to said service unit by way of a bus line, comprising:

• a total throughput control section for storing current total throughput information of said bus line;
• a first packet controller for extracting, when a call request packet transmitted from one of said plurality of data terminals and including data transmission throughput information is received by way of said bus line, the throughput information and sending out a call request packet in response to permission of origination of a call to said service unit;
• a second packet controller for receiving and identifying a packet inputted thereto from a network side by way of said service unit;
• and
• a traffic controller for subtracting, when the throughput information is inputted thereto from said first packet controller, the current total throughput information obtained from said total throughput control section from a transmission capacity of said bus line, comparing a value obtained by the subtraction with the throughput information inputted thereto from said first packet controller to determine whether or not the call request should be accepted, and notifying, when the call request should be accepted, permission of origination of a call to said first packet controller and changing the current total throughput information stored in said total throughput control section to a value obtained by addition of the throughput information to the current total throughput information, but cancelling, when the call request should be rejected, the received call request packet and sending to said first packet controller an instruction to send out a clear indication packet to said bus line.