Multiplex communications – Wide area network – Packet switching
Patent
1992-10-27
1994-05-10
Safourek, Benedict V.
Multiplex communications
Wide area network
Packet switching
370 853, H04B 138
Patent
active
053111141
ABSTRACT:
A downward compatible full-duplex 10Base-T ethernet transceiver associated with either the hub or the remote node in an ethernet network includes generator circuitry for generating a full-duplex-capability signal indicating its full-duplex capability for transmission over the twisted pair link and detector circuitry for detecting transmission of such a signal from the transceiver with which it is communicating across the twisted pair link. The detector circuitry responds to the full-duplex-capability signal by sending a full-duplex enable signal to an ethernet controller configured according to the present invention. An ethernet controller contains circuitry responsive to the full-duplex-enable signal to disable transmission deferral in response to a carrier-sense signal generated by the transceiver. The full-duplex-capability indicator portion may comprise an extra pulse following an Nth link-integrity pulse after a delay of between about 2-7 .mu.sec.
REFERENCES:
patent: 4701909 (1987-10-01), Kavehrad
patent: 4897831 (1990-01-01), Negi et al.
patent: 5012467 (1991-04-01), Crane
patent: 5079766 (1992-01-01), Richard
patent: 5121382 (1992-06-01), Yang et al.
Lai Woo-Ping
Sambamurthy Namakkal S.
VanGilder John P.
Safourek Benedict V.
Seeq Technology, Incorporated
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