GB897400A - Improvements in electronic devices - Google Patents

Improvements in electronic devices

Info

Publication number
GB897400A
GB897400A GB4368860A GB4368860A GB897400A GB 897400 A GB897400 A GB 897400A GB 4368860 A GB4368860 A GB 4368860A GB 4368860 A GB4368860 A GB 4368860A GB 897400 A GB897400 A GB 897400A
Authority
GB
United Kingdom
Prior art keywords
counter
gates
toggles
alarm
pulse
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
GB4368860A
Inventor
Francesco Ambrosino
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
Priority to GB4368860A priority Critical patent/GB897400A/en
Publication of GB897400A publication Critical patent/GB897400A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K21/00—Details of pulse counters or frequency dividers
    • H03K21/40—Monitoring; Error detection; Preventing or correcting improper counter operation

Landscapes

  • Monitoring And Testing Of Exchanges (AREA)
  • Alarm Systems (AREA)

Abstract

897,400. Counters. STANDARD TELEPHONES & CABLES Ltd. Dec. 20, 1960, No. 43688/60. Class 106 (1). In an electronic ring counter, if more than the correct number of devices constituting the counter are simultaneously in the operated state a fault detector operates, and means are further provided to test the fault detector. In the example described, only one of the toggles A-N should be in the "1 " state at any time. The conditioning gates GA-GN are shown, but not the usual strobe gates. If two toggles should be operated simultaneously a gate G1 opens to operate toggle Y, and provided the test circuit is not being used, gates G6, G7 open to operate an alarm. The fault detector is tested while the counter is otherwise idle by applying a P1 pulse to two adjacent toggles. The counter then runs with a pair of adjacent toggles operative, AB, BC, CD, &c. The pulse P1 is followed immediately by a pulse P2 which operates toggle X so that both X and Y are operated whereby gate G6 is closed to prevent operation of the alarm. X resets Y at alternate stages through gate G3. If X fails to reset Y at these stages one of gates G9 operates the alarm. In a modification, Fig. 3, a ring counter which normally runs at a low speed is run at a higher speed for fault detection. Advance is controlled by toggle S which automatically resets itself. The speed of the counter therefore depends on the frequency of the input to S.
GB4368860A 1960-12-20 1960-12-20 Improvements in electronic devices Expired GB897400A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB4368860A GB897400A (en) 1960-12-20 1960-12-20 Improvements in electronic devices

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4368860A GB897400A (en) 1960-12-20 1960-12-20 Improvements in electronic devices

Publications (1)

Publication Number Publication Date
GB897400A true GB897400A (en) 1962-05-23

Family

ID=10429872

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4368860A Expired GB897400A (en) 1960-12-20 1960-12-20 Improvements in electronic devices

Country Status (1)

Country Link
GB (1) GB897400A (en)

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