Multiplex communications – Wide area network – Packet switching
Patent
1986-11-24
1988-03-08
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 94, H04J 302, H04J 324
Patent
active
047303077
ABSTRACT:
A bus accessing method and apparatus for the practice thereof, in a communication network, for transmitting information packets without the need for long communication periods following each transmission, is disclosed. The network comprises transmit and receive buses, a plurality of BIUs coupled between the buses, and a head-end for directing packets leaving the transmit bus onto the receive bus. Each packet has a preamble with a gap long enough to enable receiving BIUs to reset for receipt of a new packet. Each BIU in an active state with a packet to transmit measures a first time period so long as it detects no signals on the receive bus. The BIU transitions to a wait state upon completing the first time period measurement and initiates a second time period measurement. Upon completing the second time period measurement, the BIU transitions to a transmit state and initiates transmission of its packet, reverting to the active state upon completing transmission. The BIU transitions to the preempted state if upstream signals are detected during the second time period measurement or during transmission. In the preempted state the BIU measures a third time period so long as no upstream signals are detected and upon completing this measurement transitions to the transmit state.
REFERENCES:
patent: 4506361 (1985-03-01), Kume
patent: 4517670 (1985-05-01), Ulug
patent: 4536877 (1985-08-01), Livingston et al.
patent: 4551833 (1985-11-01), Turner
"D-Net, A New Scheme for High Data Rate Optical Local Area Networks" by Tseng et al, IEEE Journal on Selected Areas of Communications, vol. SAC-1, No. 3, Apr. 1983.
Hughes William C.
Stein Charles R.
Burgujian Richard V.
Davis Jr. James C.
General Electric Company
Olms Douglas W.
Scutch III Frank M.
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