GB1325470A - Line fault detector means for use in telegraph systems - Google Patents

Line fault detector means for use in telegraph systems

Info

Publication number
GB1325470A
GB1325470A GB5629770A GB1325470DA GB1325470A GB 1325470 A GB1325470 A GB 1325470A GB 5629770 A GB5629770 A GB 5629770A GB 1325470D A GB1325470D A GB 1325470DA GB 1325470 A GB1325470 A GB 1325470A
Authority
GB
United Kingdom
Prior art keywords
fault
receiver
loss
current
lamp
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
GB5629770A
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.)
MESSGERAETEWERK ZWOENITZ GERAE
Original Assignee
MESSGERAETEWERK ZWOENITZ GERAE
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 MESSGERAETEWERK ZWOENITZ GERAE filed Critical MESSGERAETEWERK ZWOENITZ GERAE
Publication of GB1325470A publication Critical patent/GB1325470A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Locating Faults (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)

Abstract

1325470 Telegraphy; loss of signal detection KOMBINAT VEB MESSGERATEWERK ZWONITZ GERATEWERK KARL-MARXSTADT 26 Nov 1970 56297/70 Heading H4P A loss of incoming signal fault, on detection is arranged to temporarily switch off a receiver and provide a fault indication, then subsequently reconnect the receiver on removal of the fault. Terminals a, b, connected to telegraph lines, are shunted by a differentiating element C1, W1 producing pulses of alternating polarity in synchronism with received telegraph signal changes, each of which switch over the state of a transistor multivibrator 2 having an integrating element 3 at its output. Single current operation.-If a fault occurs there will be a negative pulse in differentiating element 1 and voltage across element 3 rises and if no further switching occurs within 130 ms. the Zener diodes D3, D4 conduct, providing a voltage on line Ust, switching off the receiver (7) also causing conduction of a transistor T3 thus energizing fault lamp La. On resumption of normal transmission the integrating element 3 becomes discharged, thus Zener diodes D3, D4 cease conduction hence the receiver is reconnected and lamp La is extinguished. Double current operation.-A polarized receiver is provided in which a fault during a negative, marking, current switches off receiver 7; owing to its polarized operation a fault during positive, spacing, current would have the same effect.
GB5629770A 1970-09-02 1970-11-26 Line fault detector means for use in telegraph systems Expired GB1325470A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DD14989270 1970-09-02
GB5629770 1970-11-26
DD15635071 1971-07-08

Publications (1)

Publication Number Publication Date
GB1325470A true GB1325470A (en) 1973-08-01

Family

ID=27179769

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5629770A Expired GB1325470A (en) 1970-09-02 1970-11-26 Line fault detector means for use in telegraph systems

Country Status (1)

Country Link
GB (1) GB1325470A (en)

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PLNP Patent lapsed through nonpayment of renewal fees