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US 5,510,920 AGranted
Local area network
AssigneeFuji Xerox Co., Ltd.
InventorTakeshi Ota
Life of this patent
Estimating the term…
Abstract
A multi-media local area network capable of carrying out intercommunication such as data communication and transmission of audio and video signals. The network is formed as an optical communication network using interconnectable star couplers and optical link amplifiers to compensate for optical signal attenuation occuring in the communication network.
Claims16
An optical communication network comprising:
- a plurality of passive star couplers, each passive star coupler having a plurality of terminals through which an optical signal is output and input, each of said passive star couplers having a transfer characteristic such that an input signal which is initially inputted to one of said terminals is distributed as an output signal to all terminals other than said one terminal, and said passive star couplers being optically coupled to each other through said terminals;
- a plurality of nodes, and communicating with each other through said passive star couplers;
- and
- a plurality of transmission channels, each transmission channel being wavelength multiplexed among said nodes;
- wherein said nodes communicate with each other by a determined wavelength optical signal through each of said transmission channels.
2 more elements
A local area network comprising:
- a single contention bus having bidirectionality;
- at least one time division bus having bidirectionality;
- a plurality of nodes connected to both said contention bus and said time division bus;
- and
- at least one time division device corresponding to said at least one time division bus, said time division device connected to both said contention bus and said time division bus;
- one of said nodes transmitting an access requiring packet to said time division device through said contention bus,
- said time division device transmitting a token, in which at least one of two addresses of said one node is written onto said time division bus in a time slot under control by said time division control device;
- said one node transmitting said packet onto said time division control bus in which said token is found immediately after receiving said token within said time slot.
5 more elements
A local area network comprising:
- a single contention bus;
- at least one time division bus;
- a plurality of nodes connected to both said contention bus and said time division bus;
- and
- at least one time division device corresponding to said one time division bus, said time division device connected to both said contention bus and said time division bus;
- one of said nodes transmitting an access requiring packet to said time division device through said contention bus,
- said time division device transmitting a token, in which an address of said one node is written, onto said time division bus in a time slot under control by said time division control device,
- said one node transmitting said packet onto said time division control bus in which said token is found immediately after receiving said token within said time slot.
5 more elements
Dependencies are inferred from the claim text.