Multiplex communications – Wide area network – Packet switching
Patent
1988-09-21
1989-09-12
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 856, 370 943, H04J 326
Patent
active
048667021
ABSTRACT:
A star topology local area network comprises a data bus, a receive-not-ready bus, a plurality of bus access units associated respectively with user terminals for receiving a request therefrom, and an arbiter for assigning priority to one of the bus access units when requests for transmission occur simultaneously. Each of the bus access units comprises a transmit buffer for storing a packet from the associated user terminal and forwarding it to the data bus when priority is assigned to it and a receive buffer for storing a packet from the data bus and forwarding it to the associated user terminal. An address filter is provided in each bus access unit to detect a packet addressed to it and applies a receive-not-ready signal to the receive-not-ready bus when the receive buffer has an insufficient capacity to receive the detected packet. A bus access controller is connected to the receive-not-ready bus for terminating the transmission of a packet in response to the receive-not-ready signal. The storage capacity of the transmit buffer is also monitored and a proceed-to-send signal is transmitted from the bus access unit to the associated user terminal indicating the permission of transmission when the detected storage capacity is sufficient to receive a packet from the terminal.
REFERENCES:
patent: 4550402 (1985-10-01), Gable et al.
Katsura Yoshihiko
Kawatoko Tsurayuki
Sakamoto Hidenori
Shimizu Horoshi
Marcelo Melvin
NEC Corporation
Olms Douglas W.
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