Active t-coupler for fiber optic local networks which...

Details Active t-coupler for fiber optic local networks which... Active t-coupler for fiber optic local networks which...

H - Electricity

04

L

325/1, 328/114.3

H04L 12/413 (2006.01) H04B 10/16 (2006.01)

Patent

CA 1145417

ABSTRACT OF THE DISCLOSURE An active T-coupler for fiber optic local networks which permits collision detection wherein two input optical fibers are coupled to photodetectors The two optical fibers are coupled to receive light from light sources. Driving the light sources are gate circuits which function in a manner similar to an OR gate, via driver circuits, These OR gates receive electrical signals from the host station or an input light fiber detector. Further, the input detectors provide electrical signals to the driving OR gates to pass the signal on, i.e. repeat, or drive an OR gate to transmit the signal to the host station. Thus the coupler can act as an optical re- peater or transmit originally generated light signals in either the forward or reverse directions. Further, the host station can monitor the electrical signals from the input detectors to detect the occurrence of a data collision while transmitting and thereby react appropriately.

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