High-speed ring LAN system
First Claim
1. A high-speed ring LAN system for interconnecting a plurality of subnetworks, comprising:
- at least one LAN ring-like transmission path for transmitting a plurality of transmission frames in a time-division multiplexed frame form, each of said transmission frames having a predetermined signal transmission rate and comprising at least one control information transmission area for carrying control information for frame transmission and at least one data transmission area for carrying a container frame having a plurality of fixed length time slots; and
a plurality of node devices interconnected by the ring-like transmission path, each node device including;
an interface for accommodating one of the subnetworks;
means for separating the time-division multiplexed frame received from said ring-like transmission path into individual transmission frames to output them on a plurality of channels, respectively;
means for temporarily storing at least a part of respective container frames extracted from the data transmission area of said separated individual transmission frames on said channels;
means for generating a plurality of new transmission frames on each channel at the predetermined signal transmission rate based on a clock signal obtained from a local clock generator and for transferring data packets in the time slots of said container frames derived from said storing means to new container frames of said new transmission frames;
means for time-division multiplexing said new transmission frames including said new container frames to form a time-division multiplexed frame to be transmitted to a next node device through said ring-like transmission path; and
means provided between said storing means and said generating means, for exchanging data packets of a fixed length between at least one of the container frames on said channels and the interface.
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Accused Products
Abstract
A high-speed ring LAN capable of accommodating at least one public network having a signal transmission rate of 155.57 MHz, and at least one sub-LAN having a signal transmission rate of 100 MHz. The high-speed LAN has a signal transmission rate of 155.52 Mbps×n (n is an even number). SONET (Synchronous Optical NETwork) subframes each comprising a 9 bytes×9 section overhead area and a 261 bytes×9 virtual container 4 (VC-4) area flow in a time-divisional n-multiplexed format. The respective node devices inserted in the transmission path have one or more ports to accommodate sub-LANs or public networks. Information is exchanged in units of a fixed-length packet between a received SONET subframe and an asynchronous packet whereas information is exchanged in units of a byte between the SONET subframe and a synchronous port.
44 Citations
27 Claims
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1. A high-speed ring LAN system for interconnecting a plurality of subnetworks, comprising:
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at least one LAN ring-like transmission path for transmitting a plurality of transmission frames in a time-division multiplexed frame form, each of said transmission frames having a predetermined signal transmission rate and comprising at least one control information transmission area for carrying control information for frame transmission and at least one data transmission area for carrying a container frame having a plurality of fixed length time slots; and a plurality of node devices interconnected by the ring-like transmission path, each node device including; an interface for accommodating one of the subnetworks; means for separating the time-division multiplexed frame received from said ring-like transmission path into individual transmission frames to output them on a plurality of channels, respectively; means for temporarily storing at least a part of respective container frames extracted from the data transmission area of said separated individual transmission frames on said channels; means for generating a plurality of new transmission frames on each channel at the predetermined signal transmission rate based on a clock signal obtained from a local clock generator and for transferring data packets in the time slots of said container frames derived from said storing means to new container frames of said new transmission frames; means for time-division multiplexing said new transmission frames including said new container frames to form a time-division multiplexed frame to be transmitted to a next node device through said ring-like transmission path; and means provided between said storing means and said generating means, for exchanging data packets of a fixed length between at least one of the container frames on said channels and the interface. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A ring LAN system comprising:
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at least one ring-like transmission path for transmitting a plurality of transmission frames in a time-division multiplexed frame form, each of said transmission frames having a predetermined signal transmission rate and comprising at least one control information area for carrying control information for frame transmission and at least one data area for carrying a container frame divided into a plurality of fixed length time slots; and a plurality of node devices interconnected by the ring-like transmission path, each node device including; at least one interface for connecting a subsystem to said ring LAN system; means for separating the time-division multiplexed frame received from said ring-like transmission path into individual transmission frames to output them on a plurality of channel paths, respectively; means for temporarily storing contents of the respective container frames extracted from the data areas of said separated individual transmission frames on said channel paths; means for generating in parallel a plurality of new transmission frames at the predetermined signal transmission rate based on a clock signal generated from a local clock generator located in the node device and for transferring data packets in said container frames from said storing means to said new transmission frames; means for time-division multiplexing said new transmission frames to form a time-division multiplexed frame to be transmitted to a next node device through said ring-like transmission path; and means provided between said storing means and said generating means, for exchanging data packets of a fixed length between the interface and the container frames derived from said storing means. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24)
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25. A ring LAN system comprising:
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at least one ring-like transmission path for transmitting a plurality of transmission frames in a time-division multiplexed frame form, each of said transmission frames having at least one control information area for carrying control information for frame transmission and at least one data area for carrying a container frame divided into a plurality of fixed length time slots; and a plurality of node devices interconnected by the ring-like transmission path, each node device including; a plurality of interfaces for connecting thereto subsystems treating synchronous or asynchronous information; means for separating the time-division multiplexed frame received from said ring-like transmission path into individual transmission frames and for outputting received container frames in said individual transmission frames to a plurality of channel paths in parallel; means for generating in parallel a plurality of new transmission frames at a predetermined signal transmission rate based on a clock signal generated in said node device locally and for transferring data packets in said container frames to said new transmission frames; means for time-division multiplexing said new transmission frames to form a multiplexed frame to be transmitted to a next node device through said ring-like transmission path; and means provided between said separating means and said generating means, for exchanging data packets of a fixed length between an interface and said received container frames. - View Dependent Claims (26, 27)
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Specification