US5247518A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High-speed ring lan system
Assignee: Hitachi Ltd
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Filing: 1992-01-13
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Granted: 1993-09-21
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Expires: 2012-01-13
Abstract
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 port whereas information is exchanged in units of a byte between the SONET subframe and a synchronous port.
Inventors
- 👤 Yoshihiro Takiyasu
- 👤 Toshiki Tanaka
- 👤 Taihei Suzuki
- 👤 Eiichi Amada
- 👤 Yukiji Yamauchi
- 👤 Mitsuhiro Yamaga
- 👤 Matsuaki Terada
- 👤 Kunio Hiyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:28
CPC Classifications
H; H04; H04Q; H04Q11/00; H04Q11/04; H04Q11/0428; H04Q11/0478; H04J; H04J3/00; H04J3/02; H04J3/08; H04J3/16; H04J3/1605; H04J3/1611; H04J3/1617; H04L; H04L12/00; H04L12/28; H04L12/42; H04L12/427; H04L12/43; H04J2203/00; H04J2203/0001; H04J2203/0028; H04J2203/0039; H04J2203/0042; H04J2203/0089; H04L12/54; H04L12/56; H04L12/5601; H04L2012/5638; H04L2012/5646; H04L2012/5652; H04L2012/5672
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
210 words
A ring LAN system comprising: at least one ring-like transmission path for transmitting a plurality of transmission frames having a predetermined signal transmission rate and comprising at least one control information area for carrying control information for data 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 means for connecting a subsystem to said ring LAN system, means for extracting the container frame from the data area of each of said transmission frames received from said ring-like transmission path, means for generating a plurality of new transmission frames at the predetermined signal transmission rate based on a clock signal generated by a local clock generator located in the node device, means connected to said interface means, said extracting means and said generating means, for exchanging data packets of a fixed length between said interface means and the container frames derived from said extracting means and for transferring the container frames carring said exchanged data packets to said new transmission frames generated by said generating means, and means for transmitting said new transmission frames to said ring-like transmission path.
Claim 2
Dependent Claim
210 words
A ring LAN system comprising: at least one ring-like transmission path for transmitting a plurality of transmission frames having a predetermined signal transmission rate and comprising at least one control information area for carrying control information for data 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 means for connecting a subsystem to said ring LAN system, means for extracting the container frame from the data area of each of said transmission frames received from said ring-like transmission path, means for generating a plurality of new transmission frames at the predetermined signal transmission rate based on a clock signal generated by a local clock generator located in the node device, means connected to said interface means, said extracting means and said generating means, for exchanging data packets of a fixed length between said interface means and the container frames derived from said extracting means and for transferring the container frames carring said exchanged data packets to said new transmission frames generated by said generating means, and means for transmitting said new transmission frames to said ring-like transmission path.
Claim 3
Dependent Claim
53 words
A ring LAN system according to claim 1, wherein each of said node device further comprises: means for adjusting the location of the first byte of the container frames on said new transmission frames according to a difference of the signal transmission rates of the received transmission frames and said new transmission frames.
Claim 4
Dependent Claim
31 words
A ring LAN system according to claim 2, wherein each of said new transmission frames includes control information indicating the location of the first byte of the container frames transferred thereto.
Claim 5
Dependent Claim
68 words
A ring LAN system according to claim 1, wherein said exchanging means comprises: means for temporarily storing at least one data packet to be carried by the container frames transferred to said new transmission frames; and means for adjusting the location of the first byte of each of the container frames on said new transmission frames according to the quantity of data packets stored in said storing means.
Claim 6
Dependent Claim
31 words
A ring LAN system according to claim 4, wherein each of said new transmission frame includes control information indicating the location of the first byte of the container frames transferred thereto.
Claim 7
Dependent Claim
27 words
A ring LAN system according to claim 1, wherein said generating means includes means for generating each of said new transmission frames within a 125 μsec. period.
Claim 8
Dependent Claim
27 words
A ring LAN system according to claim 2, wherein said generating means includes means for generating each of said new transmission frames within a 125 μsec. period.
Claim 9
Dependent Claim
28 words
A ring LAN system according to claim 3, wherein said said generating means includes means for generating each of said new transmission frames within a 125 μsec. period.
Claim 10
Dependent Claim
28 words
A ring LAN system according to claim 4, wherein said said generating means includes means for generating each of said new transmission frames within a 125 μsec. period.
Claim 11
Dependent Claim
28 words
A ring LAN system according to claim 5, wherein said said generating means includes means for generating each of said new transmission frames within a 125 μsec. period.
Claim 12
Dependent Claim
247 words
A ring LAN system comprising: at least one ring-like transmission path for transmitting a plurality of transmission frames having a predetermined signal transmission rate and comprising at least one control information area for carrying control information for data 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 means for connecting thereto a subsystem treating synchronous information or asynchronous information, means for extracting the container frame from the data area of each of said transmission frames received from said ring-like transmission path, means for generating a plurality of new transmission frames at the predetermined signal transmission rate based on a clock signal generated by a local clock generator located in the node device, means connected to said interface means, said extracting means and said generating means, for exchanging data packets of a fixed length between said interface means and container frames derived from said extracting means and for transferring the container frames carrying said data packets to said new transmission frames generated by said generating means, and means for transmitting said new transmission frames to said ring-like transmission path; wherein said exchanging means selectively exchanges data packets between said interface means and said container frames depending upon whether the type of information treated by the subsystem connected to said interface means is synchronous or asynchronous information.
Claim 13
Dependent Claim
247 words
A ring LAN system comprising: at least one ring-like transmission path for transmitting a plurality of transmission frames having a predetermined signal transmission rate and comprising at least one control information area for carrying control information for data 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 means for connecting thereto a subsystem treating synchronous information or asynchronous information, means for extracting the container frame from the data area of each of said transmission frames received from said ring-like transmission path, means for generating a plurality of new transmission frames at the predetermined signal transmission rate based on a clock signal generated by a local clock generator located in the node device, means connected to said interface means, said extracting means and said generating means, for exchanging data packets of a fixed length between said interface means and container frames derived from said extracting means and for transferring the container frames carrying said data packets to said new transmission frames generated by said generating means, and means for transmitting said new transmission frames to said ring-like transmission path; wherein said exchanging means selectively exchanges data packets between said interface means and said container frames depending upon whether the type of information treated by the subsystem connected to said interface means is synchronous or asynchronous information.
Claim 14
Dependent Claim
41 words
A ring LAN system according to claim 11, wherein each of the time slots of said container frames includes at least one indication bit for indicating whether a data packet carried by the time slot is synchronous one or asynchronous one.
Claim 15
Dependent Claim
53 words
A ring LAN system according to claim 11, wherein each of said node devices further comprises: means for adjusting the location of the first byte of the container frames on said new transmission frames according to a difference of the signal transmission rates of the received transmission frames and said new transmission frames.
Claim 16
Dependent Claim
31 words
A ring LAN system according to claim 13, wherein each of said new transmission frames includes control information indicating the location of the first byte of the container frames transferred thereto.
Claim 17
Dependent Claim
68 words
A ring LAN system according to claim 11, wherein said exchanging means comprises: means for temporarily storing at least one data packet to be carried by the container frames transferred to said new transmission frames; and means for adjusting the location of the first byte of each of the container frames on said new transmission frames according to the quantity of data packets stored in said storing means.
Claim 18
Dependent Claim
31 words
A ring LAN system according to claim 15, wherein each of said new transmission frames includes control information indicating the location of the first byte of the container frames transferred thereto.
Claim 19
Dependent Claim
27 words
A ring LAN system according to claim 11, wherein said generating means includes means for generating each of said new transmission frames within a 125 μsec. period.
Claim 20
Dependent Claim
27 words
A ring LAN system according to claim 12, wherein said generating means includes means for generating each of said new transmission frames within a 125 μsec. period.
Claim 21
Dependent Claim
27 words
A ring LAN system according to claim 13, wherein said generating means includes means for generating each of said new transmission frames within a 125 μsec. period.
Claim 22
Dependent Claim
27 words
A ring LAN system according to claim 14, wherein said generating means includes means for generating each of said new transmission frames within a 125 μsec. period.
Claim 23
Dependent Claim
27 words
A ring LAN system according to claim 15, wherein said generating means includes means for generating each of said new transmission frames within a 125 μsec. period.
Claim 24
Dependent Claim
27 words
A ring LAN system according to claim 16, wherein said generating means includes means for generating each of said new transmission frames within a 125 μsec. period.
Claim 25
Dependent Claim
273 words
A ring LAN system comprising: at least one ring-like transmission path for transmitting a plurality of transmission frames having a predetermined signal transmission rate and comprising at least one control information area for carrying control information for data transmission and at least one data area for carrying a container frame divided into a plurality of fixed length time slots each for use in data packet transmission, each of said time slots having an access control field for carrying slot access control information, a header field for carrying identifier information of the data packet and an information field for carrying substantial contents of the data packet; and a plurality of node devices interconnected by the ring-like transmission path, each node device including: at least one interface means for connecting a subsystem to said ring LAN system, means for extracting the container frame from the data area of each of said transmission frames received from said ring-like transmission path, means for generating a plurality of new transmission frames at the predetermined signal transmission rate based on a clock signal generated by a local clock generator provided for each node device, means connected to said interface means, said extracting means and said generating means, for exchanging data packets of a fixed length between said interface means and time slots of container frames derived from said extracting means depending upon contents of the access control field and header field of the time slots and for transferring the container frames carrying said exchanged data packets to said new transmission frames generated by said generating means, and means for transmitting said new transmission frame to said ring-like transmission path.
Claim 26
Dependent Claim
273 words
A ring LAN system comprising: at least one ring-like transmission path for transmitting a plurality of transmission frames having a predetermined signal transmission rate and comprising at least one control information area for carrying control information for data transmission and at least one data area for carrying a container frame divided into a plurality of fixed length time slots each for use in data packet transmission, each of said time slots having an access control field for carrying slot access control information, a header field for carrying identifier information of the data packet and an information field for carrying substantial contents of the data packet; and a plurality of node devices interconnected by the ring-like transmission path, each node device including: at least one interface means for connecting a subsystem to said ring LAN system, means for extracting the container frame from the data area of each of said transmission frames received from said ring-like transmission path, means for generating a plurality of new transmission frames at the predetermined signal transmission rate based on a clock signal generated by a local clock generator provided for each node device, means connected to said interface means, said extracting means and said generating means, for exchanging data packets of a fixed length between said interface means and time slots of container frames derived from said extracting means depending upon contents of the access control field and header field of the time slots and for transferring the container frames carrying said exchanged data packets to said new transmission frames generated by said generating means, and means for transmitting said new transmission frame to said ring-like transmission path.
Claim 27
Dependent Claim
50 words
A ring LAN system according to claim 23, wherein the access control field of each of said time slots carrying data packets includes at least one bit of classification information for indicating to which of synchronous information, asynchronous information and inter-node control information the contents of said information field corresponds.
Claim 28
Dependent Claim
33 words
A ring LAN system according to claim 23, wherein the header field of each of said time slots carrying data packets includes a source address and a destination address of the data packet.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-09-20 | 1997-03-22 | 1997-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-09-20 | 2001-03-22 | 2001-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-09-20 | 2005-03-22 | 2005-09-21 | $7700.00 | Window Closed / Lapsed |