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JPS54101203A - Repeater for data transmission - Google Patents

Repeater for data transmission

Info

Publication number
JPS54101203A
JPS54101203A JP719978A JP719978A JPS54101203A JP S54101203 A JPS54101203 A JP S54101203A JP 719978 A JP719978 A JP 719978A JP 719978 A JP719978 A JP 719978A JP S54101203 A JPS54101203 A JP S54101203A
Authority
JP
Japan
Prior art keywords
failure
clock
circuit
state
repeater
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
JP719978A
Other languages
Japanese (ja)
Inventor
Yasuo Kaminaga
Takeshi Hirayama
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 JP719978A priority Critical patent/JPS54101203A/en
Publication of JPS54101203A publication Critical patent/JPS54101203A/en
Pending 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
    • H04L1/24—Testing correct operation

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Small-Scale Networks (AREA)

Abstract

PURPOSE:To estabilich the control unit for data transmission detectable almost all the failures for repeater. CONSTITUTION:The failure detection and selection circuit 20 monitors the clock signal of the clock reproduction circuit 13 of PLL system other than the output signal of the drive circuit 12, and detects the state of free run of the clock signal of the clock reproduction circfuit 13 by a failure of the demodulation circuit 10, extending the range of failure detection. Further, if a repeater at the pre-stage is in failure, the clock signal of the clock reproduction circuit 13 is in free run state in synchronizing with the clock in free run state, and no clock signal is inputted to the switching, causing similarly free run state. Thus, the wave shape signal from the wave shape circuit 9 is monitored, and if the wave shape signal is not of repetitive period as expected, the selection circufit 20 keeps present state, since it can not be discriminated whether the repeater at the pre-state is in failure or it is in failure of itself.
JP719978A 1978-01-27 1978-01-27 Repeater for data transmission Pending JPS54101203A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP719978A JPS54101203A (en) 1978-01-27 1978-01-27 Repeater for data transmission

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP719978A JPS54101203A (en) 1978-01-27 1978-01-27 Repeater for data transmission

Publications (1)

Publication Number Publication Date
JPS54101203A true JPS54101203A (en) 1979-08-09

Family

ID=11659353

Family Applications (1)

Application Number Title Priority Date Filing Date
JP719978A Pending JPS54101203A (en) 1978-01-27 1978-01-27 Repeater for data transmission

Country Status (1)

Country Link
JP (1) JPS54101203A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60189156U (en) * 1984-05-24 1985-12-14 松下電工株式会社 repeater panel
US5317278A (en) * 1990-07-23 1994-05-31 Rc Concepts, Inc. Switched active fault locate filter

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5162602A (en) * 1974-11-28 1976-05-31 Nippon Shisutemu Kogyo Kk

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5162602A (en) * 1974-11-28 1976-05-31 Nippon Shisutemu Kogyo Kk

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60189156U (en) * 1984-05-24 1985-12-14 松下電工株式会社 repeater panel
JPH0427237Y2 (en) * 1984-05-24 1992-06-30
US5317278A (en) * 1990-07-23 1994-05-31 Rc Concepts, Inc. Switched active fault locate filter

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