Control circuit for half-duplex/simplex interface in communicati

Details Control circuit for half-duplex/simplex interface in communicati Control circuit for half-duplex/simplex interface in communicati

1991-03-21

1993-05-18

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 24, H04L 516

Patent

active

052126854

ABSTRACT:
An interface circuit for connecting an electrical half-duplex system to an optical simplex system includes logic which permits keep-alive signals to be gated onto the transmitting simplex fiber when data is not being received on the half-duplex conductor. The interface circuit includes receive logic connected in parallel with the receive data path. The receive logic responds to predetermined bit patterns in the received data to control the receive and transmit data path connections. The interface circuit also includes transmit logic connected in parallel with the transmit data path. The transmit logic responds to bit patterns in the data on the transmit data path to selectively gate the output of a keep-alive oscillator onto the transmit simplex fiber.

REFERENCES:
patent: 3979723 (1976-09-01), Hughes et al.
patent: 4288869 (1981-09-01), Kolodzey et al.
patent: 4672601 (1987-06-01), Ablay

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