JPS56132839A - Digital radio circuit switching system - Google Patents

Digital radio circuit switching system

Info

Publication number
JPS56132839A
JPS56132839A JP3630080A JP3630080A JPS56132839A JP S56132839 A JPS56132839 A JP S56132839A JP 3630080 A JP3630080 A JP 3630080A JP 3630080 A JP3630080 A JP 3630080A JP S56132839 A JPS56132839 A JP S56132839A
Authority
JP
Japan
Prior art keywords
circuit
dpu
stand
existing
monitoring signal
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.)
Granted
Application number
JP3630080A
Other languages
Japanese (ja)
Other versions
JPS5941335B2 (en
Inventor
Koji Asai
Kozo Morita
Yoichi Saito
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.)
Nippon Telegraph and Telephone Corp
Original Assignee
Nippon Telegraph and Telephone Corp
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 Nippon Telegraph and Telephone Corp filed Critical Nippon Telegraph and Telephone Corp
Priority to JP3630080A priority Critical patent/JPS5941335B2/en
Publication of JPS56132839A publication Critical patent/JPS56132839A/en
Publication of JPS5941335B2 publication Critical patent/JPS5941335B2/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
    • H04L1/22—Arrangements for detecting or preventing errors in the information received using redundant apparatus to increase reliability

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Detection And Prevention Of Errors In Transmission (AREA)

Abstract

PURPOSE:To obtain a digital radio circuit switching system, by which a circuit is not cut off instantaneously, that is to say, the bit synchronizing frame is not out of synchronizm, at the time of switching, in the digital transmission system which is equipped with both the existing (n) and stand-by (m) circuits. CONSTITUTION:DIV is a branch power board for making the existing circuit branch to the stand-by circuit, TX SW is a sending-end parallel switch for simultaneously sending out a signal of the existing circuit to the stand-by circuit, TX DPU is a transmission code converter for inserting a circuit monitoring signal and a frame pulse, and RX DPU is a receiving code coverter for removing a circuit monitoring signal and a frame pulse, and detecting a circuit monitoring signal. Now, in case when the bits between each system are stepped out, they are pulled in by the TX DPU. And, when a fault has been detected, the fault information is sent out to the receiving end AS, and the receiving-end change-over switch RX SW is operated immediately.
JP3630080A 1980-03-24 1980-03-24 Digital wireless line switching method Expired JPS5941335B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3630080A JPS5941335B2 (en) 1980-03-24 1980-03-24 Digital wireless line switching method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3630080A JPS5941335B2 (en) 1980-03-24 1980-03-24 Digital wireless line switching method

Publications (2)

Publication Number Publication Date
JPS56132839A true JPS56132839A (en) 1981-10-17
JPS5941335B2 JPS5941335B2 (en) 1984-10-06

Family

ID=12465957

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3630080A Expired JPS5941335B2 (en) 1980-03-24 1980-03-24 Digital wireless line switching method

Country Status (1)

Country Link
JP (1) JPS5941335B2 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6167344A (en) * 1984-09-11 1986-04-07 Nec Corp Circuit switching device
US5327275A (en) * 1990-10-30 1994-07-05 Fujitsu Limited Switching system of optical transmission lines for protecting from trouble
WO2001086926A1 (en) * 2000-05-09 2001-11-15 Fujitsu Limited Node device and no-short-break switching device

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2514643Y2 (en) * 1990-08-30 1996-10-23 株式会社ニコン Cameras that allow slow sync shooting

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6167344A (en) * 1984-09-11 1986-04-07 Nec Corp Circuit switching device
JPH043700B2 (en) * 1984-09-11 1992-01-24
US5327275A (en) * 1990-10-30 1994-07-05 Fujitsu Limited Switching system of optical transmission lines for protecting from trouble
WO2001086926A1 (en) * 2000-05-09 2001-11-15 Fujitsu Limited Node device and no-short-break switching device

Also Published As

Publication number Publication date
JPS5941335B2 (en) 1984-10-06

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