Dual media local area network interfacing

Details Dual media local area network interfacing Dual media local area network interfacing

1987-04-14

1989-07-18

Griffin, Robert L.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455601, 455612, 370 88, H04B 900

Patent

active

048500429

ABSTRACT:
A dual media network interface module includes an electrical network interface and an optical network interface each having a transmit port to which signals to be transmitted on the associated network are applied and a receiver port at which signals received on the network are generated. The receiver port of each interface is connected to the transmitter port of the other interface so that signals received on either network are retransmitted on the other network. Blocking circuits block the receiver signal of a LAN which is transmitting during the transmitting interval plus an interval which exceed the worst case propagation time for the associated network to prevent endless repetition of a signal. A preferred form of the module includes a pair of controller interfaces having transmit ports and receiver ports connected to the corresponding ports of the other controller interface and of the electrical and optical network interfaces to provide bidirectional communications between all devices connected to the module. The modules can be used to interface electrical and optical nodes in a network, to expand both electrical and optical networks, and to interconnect various combinations of electrical and optical local area networks.

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patent: 4422179 (1983-12-01), Albanese
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patent: 4539679 (1985-09-01), Bux
patent: 4566134 (1986-01-01), Harbour et al.
patent: 4587651 (1986-05-01), Nelson et al.
patent: 4710915 (1987-12-01), Kitahara
IEEE Project 802.6 on Metropolitan Area Networks, Oct. 30, 84, pp. 6, 10, 14 and 18.
Reedy, Methods of Collision Detection in Fiber Optic CSMA/CD Networks, vol. 3, No. 6, Nov., 1985.

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