GB1016568A - Fault location arrangement - Google Patents

Fault location arrangement

Info

Publication number
GB1016568A
GB1016568A GB21218/64A GB2121864A GB1016568A GB 1016568 A GB1016568 A GB 1016568A GB 21218/64 A GB21218/64 A GB 21218/64A GB 2121864 A GB2121864 A GB 2121864A GB 1016568 A GB1016568 A GB 1016568A
Authority
GB
United Kingdom
Prior art keywords
gates
outputs
output
circuits
circuit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB21218/64A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Publication of GB1016568A publication Critical patent/GB1016568A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F11/00—Error detection; Error correction; Monitoring
    • G06F11/07—Responding to the occurrence of a fault, e.g. fault tolerance
    • G06F11/08—Error detection or correction by redundancy in data representation, e.g. by using checking codes
    • G06F11/10—Adding special bits or symbols to the coded information, e.g. parity check, casting out 9's or 11's
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F11/00—Error detection; Error correction; Monitoring
    • G06F11/07—Responding to the occurrence of a fault, e.g. fault tolerance
    • G06F11/16—Error detection or correction of the data by redundancy in hardware
    • G06F11/1608—Error detection by comparing the output signals of redundant hardware
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F11/00—Error detection; Error correction; Monitoring
    • G06F11/07—Responding to the occurrence of a fault, e.g. fault tolerance
    • G06F11/16—Error detection or correction of the data by redundancy in hardware
    • G06F11/20—Error detection or correction of the data by redundancy in hardware using active fault-masking, e.g. by switching out faulty elements or by switching in spare elements
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F7/00—Methods or arrangements for processing data by operating upon the order or content of the data handled
    • G06F7/02—Comparing digital values

Landscapes

  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Computational Mathematics (AREA)
  • Mathematical Analysis (AREA)
  • Mathematical Optimization (AREA)
  • Pure & Applied Mathematics (AREA)
  • Detection And Prevention Of Errors In Transmission (AREA)
  • Test And Diagnosis Of Digital Computers (AREA)

Abstract

1,016,568. Electric selective signalling. STANDARD TELEPHONES & CABLES Ltd. May 22, 1964 [May 27, 1963], No. 21218/64. Heading G4H. In a recoding circuit there are two identical logical circuits S1, S2, each effecting the recoding and comparators A1-An for comparing the individual bits of the outputs of the two circuits and means which upon disagreement being detected causes a test circuit to determine which of the two outputs satisfies a parity check so as to indicate which of the logical circuits S1, S2 is faulty. As described the input from source W, in binary scale, passes via gates L1-Lm and L<SP>1</SP>1-L<SP>1</SP>m to the circuits S1, S2. The outputs are in the form of markings on two out of five leads. Corresponding leads in each output are connected to comparators A1-An. A disagreement sets trigger X1 causing input gates L1-Lm and L<SP>1</SP>1 to L<SP>1</SP>m to be blocked. The output gates G1-Gn and G<SP>1</SP>1-G<SP>1</SP>n are also blocked. The outputs from circuits S1, S2 are entered in shift registers R1, R2. Trigger X1, when set, sets trigger X<SP>1</SP>1 to open gates P, P1 to allow clock pulses to pass from generator PG to counter C and to cause the data in stores R1, R2 to circulate. The " 1 " bits are counted by scale-of-two counters Y1, Y2. If both outputs have the correct parity (even) gates Q2 and Q3 respond. Incorrect parities enable gates Q1 and Q4. If both these gates respond a general alarm is given. An incorrect parity on one output only gives an output from gates Q5 to Q6 to set triggers Y3 or Y4. The set outputs of either of these triggers resets trigger X1. The input and output gates relating to the faulty circuit S1 or S2 remain blocked so that it is effectively switched out of use. The register R1 or R2 relating to the non-faulty circuit is read out through gates G1-Gn or G<SP>1</SP>1-G<SP>1</SP>n. In another form the parity is tested by a parallel-type circuit to avoid the use of a recirculating shift register.
GB21218/64A 1963-05-27 1964-05-22 Fault location arrangement Expired GB1016568A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL293225 1963-05-27

Publications (1)

Publication Number Publication Date
GB1016568A true GB1016568A (en) 1966-01-12

Family

ID=19754732

Family Applications (1)

Application Number Title Priority Date Filing Date
GB21218/64A Expired GB1016568A (en) 1963-05-27 1964-05-22 Fault location arrangement

Country Status (7)

Country Link
BE (1) BE648442A (en)
CH (1) CH446774A (en)
DE (1) DE1292892B (en)
ES (1) ES300083A1 (en)
FR (1) FR1397675A (en)
GB (1) GB1016568A (en)
NL (1) NL293225A (en)

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1314695A (en) * 1962-02-08 1963-01-11 Potter Instrument Co Inc Method and apparatus for checking the accuracy of information recorded on magnetic tape in calculators

Also Published As

Publication number Publication date
ES300083A1 (en) 1964-11-16
CH446774A (en) 1967-11-15
NL293225A (en)
FR1397675A (en) 1965-04-30
DE1292892B (en) 1969-04-17
BE648442A (en) 1964-11-27

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