Method and apparatus for connecting branch networks with a trunk

Details Method and apparatus for connecting branch networks with a trunk Method and apparatus for connecting branch networks with a trunk

1991-08-12

1993-02-23

Coles, Sr., Edward L.

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359110, 370 8512, H04B 1020, H04J 1400

Patent

active

051895412

ABSTRACT:
In an optical transmission system including a trunk LAN having duplex optical transmission lines, and branch LANs connected with the trunk LAN through nodes, an optical signal on the optical transmission line of the trunk LAN is input to a node including an optical switch, an optical transmitting and receiving circuit, a serial-parallel converter, an internal bus, and a LAN interface. The optical signal input to the node is converted to an electric signal (serial data) by the optical transmitting and receiving circuit through the optical switch, and is converted to parallel data by the serial-parallel converter. Thereafter, the parallel data is output onto the internal bus. The LAN interface performs an operation for outputting the parallel data onto the internal bus to the branch LANs. Data on the branch LAN is output to the optical transmission line by the operation opposite to that described above. The node can include a signal optical transmitting and receiving circuit. A self return mode is set by the LAN interface, so that the presence/absence of malfunction of the node can be self-checked.

REFERENCES:
patent: 5060224 (1991-10-01), Konishi

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