JPS55162649A - Connection switching circuit - Google Patents

Connection switching circuit

Info

Publication number
JPS55162649A
JPS55162649A JP6989079A JP6989079A JPS55162649A JP S55162649 A JPS55162649 A JP S55162649A JP 6989079 A JP6989079 A JP 6989079A JP 6989079 A JP6989079 A JP 6989079A JP S55162649 A JPS55162649 A JP S55162649A
Authority
JP
Japan
Prior art keywords
signal
produced
transmission lines
polling
switching 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.)
Pending
Application number
JP6989079A
Other languages
Japanese (ja)
Inventor
Kiyoshi Umezawa
Shigeo Kobayashi
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.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP6989079A priority Critical patent/JPS55162649A/en
Publication of JPS55162649A publication Critical patent/JPS55162649A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks

Abstract

PURPOSE:To perform the line switching at the occurrence of a failure without requiring operational personnels, by detecting the production of failure through the monitor of polling period. CONSTITUTION:Detection circuits 51, 52 respectively have the timer circuit, which is set with the polling signal and the time out signal is produced if the next polling signal is not coming after a given time. When FF53c is set and Q signal is produced, the AND gates 60, 61 are conditioned and the transmission of information is made between the transmission lines 23 and 25. If the polling period is increased to more than the specified value or interrupted, the output signal of the detection circuit 51 is fed to the reset side of FF53c of the switching circuit 53, the output at Q' is produced, the connection between the transmission lines 23 and 25 is interrupted and the transmission lines 24 and 25 are connected.
JP6989079A 1979-06-06 1979-06-06 Connection switching circuit Pending JPS55162649A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6989079A JPS55162649A (en) 1979-06-06 1979-06-06 Connection switching circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6989079A JPS55162649A (en) 1979-06-06 1979-06-06 Connection switching circuit

Publications (1)

Publication Number Publication Date
JPS55162649A true JPS55162649A (en) 1980-12-18

Family

ID=13415766

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6989079A Pending JPS55162649A (en) 1979-06-06 1979-06-06 Connection switching circuit

Country Status (1)

Country Link
JP (1) JPS55162649A (en)

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