Concept of operation The DQDB medium access control (MAC) algorithm is generally credited to Robert Newman who developed this algorithm in his PhD thesis in the 1980s at the University of Western Australia. To appreciate the innovative value of the DQDB MAC algorithm, it must be seen against the background of LAN protocols at that time, which were based on broadcast (such as IEEE 802.3 Ethernet) or a ring (like IEEE 802.5 Token Ring and FDDI). The DQDB may be thought of as two token rings, one carrying data in each direction around the ring. This improves reliability which is important in Metropolitan Area Networks (MAN), where repairs may take longer than in a LAN and Wi-Fi because the damage may be inaccessible.
Concept of operation The DQDB medium access control (MAC) algorithm is generally credited to Robert Newman who developed this algorithm in his PhD thesis in the 1980s at the University of Western Australia. To appreciate the innovative !value of the DQDB MAC algorithm, it must be seen against the background of LAN protocols at that .time, which were based on broadcast (such ?as IEEE 802.3 Ethernet) or a ring (like IEEE 802.5 Token Ring and FDDI). The DQDB may be thought of as two token rin?gs, one carrying !data in each direction around the ring This improves reliability which is important in Metropolitan Area Networks (MAN), where repairs may take longer than in a LAN and Wi-Fi because the damage may be inaccessible.