Microcontroller-based concentrator for a data network

Details Microcontroller-based concentrator for a data network Microcontroller-based concentrator for a data network

1993-09-27

1994-10-25

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 851, H04J 314

Patent

active

053595971

ABSTRACT:
A microcontroller based multiple access unit for use in interconnecting a plurality of computers with a token ring data network. The microcontroller monitors a phantom voltage applied by a computer to determine whether the computer should be inserted into, or withdrawn from, the network. The microcontroller also monitors a manual activation device to determine whether any computer that is not providing a phantom voltage is still interconnected to the network. In such a case, the microprocessor withdraws the computer from the network. A coil-pair is directly interconnected to a plurality of microprocessor gates. The microcontroller activates the coil-pair in one manner to cause the computer to be brought into the network and reverses the plurality of the coil-pair so as to withdraw the computer from the network. The controller further includes a circuit to inhibit operation of the microcontroller when the supply voltage is unstable.

REFERENCES:
patent: 5034738 (1991-07-01), Ishihara et al.
patent: 5099473 (1992-03-01), Gupta et al.
patent: 5132832 (1992-07-01), Matz et al.

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