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US4855995A Expired / Lapsed US ⏱️ 0.0 years remaining

Method and system for data transmission

Assignee: Hitachi Ltd
•
Filing: 1987-01-27
•
Granted: 1989-08-08
•
Expires: 2007-01-27
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Abstract

Abstract Herein disclosed is a data communication system in which a plurality of node equipments are linked to a common signal transmission line so that the data may be communicated between the respective node equipments. The data communication system is characterized: in that at least one of the node equipments includes means for generating and transmitting repeatedly for a predetermined period the channel which contains a data transmission bit and a validity bit for the former bit; and in that each of the node equipments linked to the common signal transmission line partly sends out the data through said channel and partly makes the validity indicating bit indicate an invalid state, when the speed of said data is so slower than the predetermined period of said channel that the data to be sent out for the predetermined period are out of time thereby to make it possible to effect the data transmission at an arbitrary speed shorter than said predetermined period. Herein also disclosed is a data communication system in which a plurality of node equipments are jointed by a common transmission loop line and in which the information of multiple channels is repeatedly transmitted for a predetermined period to said transmission loop line so that the channel information may be sent and received between terminal equipments linked to said node equipments. The data communication system is characterized in that an identical pattern for synchronization is inserted into and transmitted by the plural head channels of each period so that the synchronization is effected at each of said node equipments by detecting the synchronizing pattern received by means of a detecting circuit.

Inventors

  • 👤 Kunio Hiyama
  • 👤 Kenji Kawakita
  • 👤 Osamu Takada

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-25 11:57
CPC Classifications
H; H04; H04M; H04M9/00; H04M9/02; H04M9/022; H04L; H04L12/00; H04L12/28; H04L12/42; H04L12/427; H04L12/43

Claims Analysis

Total Claims: 13
Claim 1
Independent Claim 135 words
A data communication system comprising a plurality of node equipments and at least one transmission loop line coupling said node equipments, at least one of said node equipments including means for generating a frame having a multiplicity of channels, at least one channel in each frame containing a region for data information and a region for indicating the validity of said data information such that a predetermined value is set in said region for indicating the validity of data information to be transmitted and data information to be transmitted is set in said region for data information if said data information is to be transmitted through a channel already occupied as a communication path from one node equipment to a designated node equipment and means for transmitting a generated frame to said transmission loop line.
Claim 2
Dependent Claim 135 words
A data communication system comprising a plurality of node equipments and at least one transmission loop line coupling said node equipments, at least one of said node equipments including means for generating a frame having a multiplicity of channels, at least one channel in each frame containing a region for data information and a region for indicating the validity of said data information such that a predetermined value is set in said region for indicating the validity of data information to be transmitted and data information to be transmitted is set in said region for data information if said data information is to be transmitted through a channel already occupied as a communication path from one node equipment to a designated node equipment and means for transmitting a generated frame to said transmission loop line.
Claim 3
Dependent Claim 43 words
A data communication system according to claim 1, wherein said frame includes a line switching region and at least one channel in said line switching region contains a region for data information and a region for indicating the validity of said data information.
Claim 4
Dependent Claim 37 words
A data communication system according to claim 1, wherein at least one channel in said frame act as a line switching region, and a sequence of channels in the same frame act as a packet switching region.
Claim 5
Dependent Claim 25 words
A data communication system according to claim 3, wherein at least two channels in each frame are assigned for communication between desired two node equipments.
Claim 6
Dependent Claim 36 words
A data communication system according to claim 1, wherein said frame includes packet switching region and at least one channel in said packet switching region contains a region for indicating the busy state of said channel.
Claim 7
Dependent Claim 37 words
A data communication system according to claim 1, wherein said frame further includes a region for controlling the link between said node equipments, and the information for controlling said line is contained in a packet switching region.
Claim 8
Dependent Claim 62 words
A data communication system according to claim 1, wherein at least one of said node equipments includes means for receiving a transmitted frame from said transmitting loop line, means for determining whether the value of the validity indicating region is a specific value and means for processing said data information when the value of the validity indicating region is the specific value.
Claim 9
Dependent Claim 43 words
A data communication system according to claim 7, wherein said frame includes a line switching region and at least one channel in said line switching region contains a region for data information and a region for indicating the validity of said data information.
Claim 10
Dependent Claim 37 words
A data communication system according to claim 7, wherein at least one channel in said frame act as a line switching region, and a sequence of channels in the same frame act as a packet switching region.
Claim 11
Dependent Claim 25 words
A data communication system according to claim 9, wherein at least two channels in each frame are assigned for communication between desired two node equipments.
Claim 12
Dependent Claim 36 words
A data communication system according to claim 7, wherein said frame includes packet switching region and at least one channel in said packet switching region contains a region for indicating the busy state of said channel.
Claim 13
Dependent Claim 37 words
A data communication system according to claim 7, wherein said frame further includes a region for controlling the link between said node equipments, and the information for controlling said line is contained in a packet switching region.

References Cited (Backward Citations)

US4154983A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1992-08-07 1993-02-06 1993-08-08 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1996-08-07 1997-02-06 1997-08-08 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2000-08-07 2001-02-06 2001-08-08 $7700.00 Window Closed / Lapsed

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