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EP0139069A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Distributed processing system with fault diagnostic

Assignee: Hitachi Ltd
•
Filing: 1984-01-12
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Granted: —
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Expires: 2004-01-12
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Abstract

Abstract In a distributed processing system having a plurality of interconnected subsystems (1 - 5) of equal level, each subsystem has a function to diagnose faults in other subsystems and protects its own subsytems based on a result of the diagnosis of the faults of the other subsystems. The subsystems may be network control processors (100, 110, 200, 210,300, 310.400,410) connected to common signal transmission lines (1200, 2300, 3400, 4100, 1400, 2100, 3200, 4300), each of which sends out major and minor loop check messages to detect the faults in the other network control processors and constitutes a bypass route (100A, 110A, 200A, 210A, 300A. 310A, 400A, 410A) to protect its own unit when the fault occurs. An address train message for checking an address of the network control processor in the system can be transmitted and received as required. A tester (EXT 1010) for checking the system status is major unit of the present invention. If a transient fault occurs in the system, a degree of the transient fault is stored and a possibility of change of the transient fault to a permanent fault is determined based on a time variation of the degree of fault. If it is determined that the transient fault will change to the permanent fault, it is informed to a man-machine system to improve a maintenability. In this manner, a loop transmission system which can be readily prediction-diagnosed for the fault is provided. The second embodiment of the present invention includes means (7160) for calculating a feedback rate of a signal sent out to the transmission line and means (7320) for calculating the degree of fault on the transmission line based on the feedback rate calculated by the calculation means.

Inventors

  • 👤 Kinji Mori
  • 👤 Shoji Miyamoto
  • 👤 Takeshi Shiraha

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-08 04:05
CPC Classifications
H; H04; H04L; H04L12/00; H04L12/28; H04L12/42; H04L12/437; G; G06; G06F; G06F11/00; G06F11/07; G06F11/0703; G06F11/0706; G06F11/0709; G06F11/16; G06F11/1608; G06F11/1625; G06F11/22; G06F11/30; G06F11/32; G06F11/324; G06F11/327; G06F11/079

Claims Analysis

Total Claims: 14
Claim 1
Independent Claim 62 words
In a distributed processing system having a plurality of interconnected subsystems (1, 2, 3, 4, 5) of equal level, a fault diagnosing distributed processing method characterized in that an operation of each of said subsystems comprises the steps of: diagnosing faults in other subsystems; and protecting its own subsystem based on a result of the diagnosis of the faults in other subsystems.
Claim 2
Dependent Claim 62 words
In a distributed processing system having a plurality of interconnected subsystems (1, 2, 3, 4, 5) of equal level, a fault diagnosing distributed processing method characterized in that an operation of each of said subsystems comprises the steps of: diagnosing faults in other subsystems; and protecting its own subsystem based on a result of the diagnosis of the faults in other subsystems.
Claim 3
Dependent Claim 107 words
A fault diagnosing distributed processing method according to Claim 1, wherein said subsystems are interconnected through common signal transmission lines (1200, 2300, 3400, 4100, 1400, 2100, 3200, 4300), and the operation of each of said subystems includes the steps of: transmitting and receiving a signal for detecting the fault in other subsystems through said common signal transmission line; - - informing the detection of the fault to other subsystems; checking a route between its own subsystem and an adjacent subsystem; and constituting a bypass route (100A, 110A, 200A, 210A, 300A, 310A, 400A, 410A) for said common signal transmission line when the fault on said route is detected.
Claim 4
Dependent Claim 59 words
A fault diagnosing distributed processing method according to Claim 2, wherein the operation of each of said subsystems includes the steps of: informing the constitution of said bypass route to other subsystems; and releasing said bypass route when the fault no longer exists in said distributed processing system and informing the release of said bypass route to other subsystems.
Claim 5
Dependent Claim 48 words
A fault diagnosing distributed processing method according to Claim 2, wherein said subsystems are network control processors (100, 110, 200, 210, 300, 310, 400, 410) and said step for detecting the fault in other subsystems uses a major loop check message and a minor loop check message. -
Claim 6
Dependent Claim 77 words
A fault diagnosing distributed processing system having a plurality of subsystems (1, 2, 3, 4, 5) of equal level interconnected through common signal transmission lines (1200, 2300, 3400, 4100, 1400, 2100, 3200, 4300), characterized in that each of said subsystems comprises means (100B, 110B, 1000B) for diagnosing fault in other subsystems through said transmission line and means (1010) for protecting its own subsystem on the basis of a result of diagnosis of the fault in other subsystems.
Claim 7
Dependent Claim 77 words
A fault diagnosing distributed processing system having a plurality of subsystems (1, 2, 3, 4, 5) of equal level interconnected through common signal transmission lines (1200, 2300, 3400, 4100, 1400, 2100, 3200, 4300), characterized in that each of said subsystems comprises means (100B, 110B, 1000B) for diagnosing fault in other subsystems through said transmission line and means (1010) for protecting its own subsystem on the basis of a result of diagnosis of the fault in other subsystems.
Claim 8
Dependent Claim 38 words
A fault diagnosing distributed processing system according to Claim 5, wherein each of said subsystems includes means for sending out an address train message and means for registering an address of its own in said address train message.
Claim 9
Dependent Claim 58 words
A fault diagnosing distributed processing system according to Claim 5, wherein said system includes means (EXT) connectable to each of said systems for receiving said result of the diagnosis of the fault, and determining and displaying a status of the fault of said distributed processing system on the basis of said result of the diagnosis of the fault.
Claim 10
Dependent Claim 35 words
A fault diagnosing distributed processing system according to Claim 7, wherein said means for determining and displaying fault status includes means for determining and displaying a bypass route constitution status and an address setting status.
Claim 11
Dependent Claim 73 words
A fault diagnosing distributed processing system having a plurality of subsystems (711 - 716, 721 - 726) of equal level interconnected through transmission lines (71, 72), characterized in that each of said subsystems comprises means (7160) for calculating a feedback rate of a signal sent out to said transmission line, and means (7320) for calculating a degree of fault on said transmission line based on the feedback rate calculated by said calculation means.
Claim 12
Dependent Claim 73 words
A fault diagnosing distributed processing system having a plurality of subsystems (711 - 716, 721 - 726) of equal level interconnected through transmission lines (71, 72), characterized in that each of said subsystems comprises means (7160) for calculating a feedback rate of a signal sent out to said transmission line, and means (7320) for calculating a degree of fault on said transmission line based on the feedback rate calculated by said calculation means.
Claim 13
Dependent Claim 54 words
A fault diagnosing distributed processing system according to Claim 9, wherein each of said subsystems includes means (7168) for storing the feedback rate calculated by said calculation means, means for reading out the content of said storing means and means for outputting a time variation of the degree of fault on said transmission line.
Claim 14
Dependent Claim 47 words
A fault diagnosing distributed processing system according to Claim 10, wherein each of said subsystems includes means for comparing said feedback rate with a predetermined value and means for predicting and outputting a time of zero feedback rate when said feedback rate is below said predetermined value.

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