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Abstract
THE DISTRIBUTED QUEUE DUAL BUS (DQDB) PROTOCOL IS MEDIA ACCESS PROTOCOL OF IEEE 802.6 STANDARD FOR METROPOLITAN AREA NETWORKS .DQDB SUFFERS FORM TWO MAJOR DRAWBACK, NAMELY, LOW BANDWIDTH UTILIZATION OF THE BASES AND SLOWLY CONVERGE TO AFAIR DISTRIBUTION OF THE BANDWIDTH TO THE STATIONS. MOST OF THE PUBLICATIONS IN THIS SUBJECT ARE RESTRICTED IN SOLVING THESE DRAWBACK CONSIDERING ONLY ONE TYPE OF TRAFFIC (USUALLYDATA) AND STUDIED THE BEHAVIOR OF ONLY ONE BUS FOR SIMPLICITY. ONE OF THE PROPOSED MODIFICATIONS FOR SOLVING THESE DRAWBACKS WAS DQDB+/-.
THIS BUILTS NUMBER OF SIMULATION PROGRAMS TO INVESTIGATE THE BEHAVIOR OF DQDB AND DQDB +/- WHEN TRANSMITTING ISOCHRONOUS AND NONISOCHRONOUS TRAFFIC, WHILE PRESERVING THE SERVICE REQUIREMENTS FOR EACH OF THEM. WE BEAR THE BURDEN OF SIMULATING THE TWO BISES ACTIVATED SIMULTANEOUSLY TO GIVE A MORE REALISTIC RESULTS. THE PERFORMANCE MEASURES ARE RESTRICTED ON EVALUATION THE DELAY, THE THROUGHPUT, THE LOSS PROBABILITY AND THE MAXIMUM NUMBER OF SOURCES THE NETWORK CAN SUPPORT REGARDING THE QUALITY OF SERVICE (QOS) REQUIREMENTS.