Communications system
AssigneeKabushiki Kaisha Toshiba
InventorTazuko Tomioka
Life of this patent
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Abstract
A communication system comprises a wavelength multiplexing network having a plurality of transmission channels of different wavelengths, a plurality of nodes interconnected by the wavelength multiplexing network for performing data communications with other nodes using time slots into which time on each of the transmission channels is divided, each of the nodes having its transmitting wavelength fixed and unique to a node and its receiving wavelength set tunable, and a network controller for centrally controlling time slot allocation repeated for each frame to the nodes.
Claims15
A communication system comprising:
- a wavelength multiplexing network having a plurality of transmission channels of different wavelengths;
- a plurality of nodes interconnected by said wavelength multiplexing network, each of said nodes making data transmission and reception in time slots, into which time on each of said transmission channels is divided, with transmitting wavelength being fixed and unique to a node and receiving wavelength being tunable;
- a network controller for centrally controlling time slot allocation to said plurality of nodes;
- and
- a communication means for connecting said network controller to said multiplexing network and said nodes so as to be able to be communicated with said networks and said nodes therethrough.
An optical communication system for performing transmission and reception for each frame including a predetermined number of time slots, comprising:
- a wavelength multiplexing optical network having a plurality of optical transmission channels of different wavelengths;
- a plurality of nodes interconnected by said wavelength multiplexing optical network, each node making data transmission and reception with transmitting wavelength fixed and receiving wavelength set tunable in time slots into which time on each of said optical transmission channels is divided;
- and
- a network controller for centrally controlling time slot allocation repeated for each frame to said plurality of nodes;
- and
- a communication means for connecting said network controller to said multiplexing network and said nodes so as to be able to be communicated with said networks and said nodes therethrough.
An optical communication system for performing transmission and reception for each frame including a predetermined number of time slots, comprising:
- a wavelength multiplexing network having a plurality of transmission channels of different wavelengths;
- a plurality of nodes interconnected by said wavelength multiplexing network, each node making data transmission and reception with transmitting wavelength fixed and receiving wavelength set tunable in time slots in which time on each of said transmission channels are divided;
- a network controller for centrally controlling time slot allocation repeated for each frame to said plurality of nodes;
- data channels for data transmission;
- and
- control channels provided independently between said network controller and each of said nodes, for transmitting control signals which include a signal to notify said network controller of a request for transmission by each of said nodes and a signal from said network controller to notify each node of a determination of time slot allocation by said network controller.
An optical communication system for performing transmission and reception for each frame including a predetermined number of time slots, comprising:
- a wavelength multiplexing network having a plurality of transmission channels of different wavelengths;
- a plurality of nodes interconnected by said wavelength multiplexing network, each node making data transmission and reception with transmitting wavelength fixed and receiving wavelength set tunable in time slots into which time on each of said transmission channels are divided;
- a network controller connected to said wavelength multiplexing network and said nodes, for centrally controlling time slot allocation repeated for each frame to said plurality of nodes;
- failure detecting means connected to said wavelength multiplexing network for detecting a failure in said network controller;
- and
- means connected to said wavelength multiplexing network for, when a failure in said network controller is detected by said failure detecting means, switching the time slot allocation to said nodes to either a preassigned-slot-allocation system in which said nodes make transmission and reception in time slots which have been scheduled in advance or a distributed-slot-allocation control system in which time slot allocation to said nodes is determined by said nodes themselves.
Dependencies are inferred from the claim text.