H - Electricity – 04 – L
Patent
H - Electricity
04
L
340/84
H04L 12/28 (2006.01) H04L 12/44 (2006.01)
Patent
CA 1322390
"Star Topology Local Area Network" ABSTRACT OF THE DISCLOSURE 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.
576995
Katsura Yoshihiko
Kawatoko Tsurayuki
Sakamoto Hidenori
Shimizu Hiroshi
Corporation Nec
Smart & Biggar
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