Multiplex communications – Wide area network – Packet switching
Patent
1989-02-07
1991-07-09
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 8514, H04J 302
Patent
active
050311743
ABSTRACT:
This invention relates to a node device which, in the case of a plurality of different types of networks are connected to one another, is able to relay and transmit a packet from a conventional type (e.g., ethernet) LAN to a FDDI LAN. The node device has a MAC sublayer for supporting the conventional LAN and a FDDI MAC sublayer for supporting the FDDI LAN. The FDDI MAC sublayer has a queue provided by a FIFO memory, a transmitting/receiving unit for transmitting, receiving and erasing a packet and a comparator. When a packet issued from a node of the conventional LAN is transmitted to the FDDI LAN via the node device, the queue stores the source address of the packet by a FIFO method. When the transmitting/receiving unit receives a packet, it compares in the comparator the source address of the received packet with the source address read from the queue. When the comparator finds the source addresses are the same each as other, the transmitting/receiving unit erases the packet without relaying and brings the source addresses in the queue up to date. In this way, a packet issued from a node of the conventional LAN is transmitted to the FDDI LAN with the address of the node of the conventional LAN. In this case, the address is used as a source address and the packet makes one round trip on the ring of the FDDI LAN to be erased in the node device.
REFERENCES:
patent: 4539679 (1985-09-01), Bux et al.
patent: 4597078 (1986-06-01), Kempf
patent: 4627052 (1986-12-01), Hoare et al.
patent: 4737953 (1988-04-01), Koch et al.
Chin Wellington
Olms Douglas W.
Sumitomo Electric Industries Ltd.
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