[go: up one dir, main page]

JPS5797749A - Synchronous switching system without momentary break - Google Patents

Synchronous switching system without momentary break

Info

Publication number
JPS5797749A
JPS5797749A JP17439080A JP17439080A JPS5797749A JP S5797749 A JPS5797749 A JP S5797749A JP 17439080 A JP17439080 A JP 17439080A JP 17439080 A JP17439080 A JP 17439080A JP S5797749 A JPS5797749 A JP S5797749A
Authority
JP
Japan
Prior art keywords
stand
current
lines
variable delay
data
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
JP17439080A
Other languages
Japanese (ja)
Inventor
Hideaki Ito
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP17439080A priority Critical patent/JPS5797749A/en
Publication of JPS5797749A publication Critical patent/JPS5797749A/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
    • H04L1/22—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 switch current and stand-by lines without momentary break, by reading the same data from current and stand-by lines and by adjusting a variable delay means so that phases of them are equal to each other. CONSTITUTION:Data are transmitted in parallel from the transmission terminal toward a current line and a stand-by line. In the current side, data D1 is read by output synchronized with a clock C1, and the signal is outputted through a variable delay circuit 3 and a switching circuit 8. In the stand-by side, the same data D2 is read by the output synchronized with a clock C2, and the signal is outputted through a variable delay circuit 6 and a switching circuit 8. For switching of current and stand-by lines, oscillators 2 and 5 synchronized with respective clocks are controlled to eliminate the phase difference, and the variable delay circuit 6 is so adjusted that the phase difference between output code strings is eliminated. After outputs of current and stand-by lines coincide with each other, they are switched.
JP17439080A 1980-12-10 1980-12-10 Synchronous switching system without momentary break Pending JPS5797749A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP17439080A JPS5797749A (en) 1980-12-10 1980-12-10 Synchronous switching system without momentary break

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP17439080A JPS5797749A (en) 1980-12-10 1980-12-10 Synchronous switching system without momentary break

Publications (1)

Publication Number Publication Date
JPS5797749A true JPS5797749A (en) 1982-06-17

Family

ID=15977761

Family Applications (1)

Application Number Title Priority Date Filing Date
JP17439080A Pending JPS5797749A (en) 1980-12-10 1980-12-10 Synchronous switching system without momentary break

Country Status (1)

Country Link
JP (1) JPS5797749A (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0180943A2 (en) * 1984-11-05 1986-05-14 Nec Corporation Channel switching system
JPS62117430A (en) * 1985-11-18 1987-05-28 Furukawa Electric Co Ltd:The No-hit switching method for optical line
US4700348A (en) * 1984-05-31 1987-10-13 Nec Corporation Hot standby communications system
JPH01119138A (en) * 1987-10-31 1989-05-11 Nec Corp Data string comparating circuit
JPH0284823A (en) * 1988-09-20 1990-03-26 Nec Corp Redundant system switching circuit network
JPH0449730A (en) * 1990-06-18 1992-02-19 Nippon Telegr & Teleph Corp <Ntt> Transmission line switching device
JPH07202857A (en) * 1993-12-28 1995-08-04 Nec Corp Non-hit switching method and its equipment
WO2001086926A1 (en) * 2000-05-09 2001-11-15 Fujitsu Limited Node device and no-short-break switching device

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4700348A (en) * 1984-05-31 1987-10-13 Nec Corporation Hot standby communications system
EP0180943A2 (en) * 1984-11-05 1986-05-14 Nec Corporation Channel switching system
JPS62117430A (en) * 1985-11-18 1987-05-28 Furukawa Electric Co Ltd:The No-hit switching method for optical line
JPH01119138A (en) * 1987-10-31 1989-05-11 Nec Corp Data string comparating circuit
JPH0284823A (en) * 1988-09-20 1990-03-26 Nec Corp Redundant system switching circuit network
JPH0449730A (en) * 1990-06-18 1992-02-19 Nippon Telegr & Teleph Corp <Ntt> Transmission line switching device
JPH07202857A (en) * 1993-12-28 1995-08-04 Nec Corp Non-hit switching method and its equipment
WO2001086926A1 (en) * 2000-05-09 2001-11-15 Fujitsu Limited Node device and no-short-break switching device

Similar Documents

Publication Publication Date Title
JPS6481407A (en) Clock signal generating system
JPS5797749A (en) Synchronous switching system without momentary break
EP0316878A3 (en) Pll circuit for generating output signal synchronized with input signal by switching frequency dividing ratio
KR850003091A (en) Oscillator circuit
JPS5336105A (en) Synchronous circuit connecting system
EP0108702A3 (en) Serial to parallel data conversion circuit
JPS5381059A (en) Digital phase synchronizing system
MY104382A (en) Signal synchronizing system.
JPS5799841A (en) Automatic signal phase matching circuit
JPS5621440A (en) Stuff synchronizing system
JPS6430350A (en) Polyspeed switching system
SU1396255A1 (en) Device for shaping relative bipulse signal
JPS57105017A (en) Multiplexing system of digital synchronizing clock
ATE42845T1 (en) PARALLEL SYNCHRONOUS OPERATION.
SU788416A1 (en) Device for cophasal receiving of pulse signals
JPS56119553A (en) Timing reproducing device
JPS5451709A (en) Bit phase synchronizing circuit
JPS55156441A (en) Stuff-synchronous multiplex conversion system for data transmission
SU1681398A1 (en) Time-division commutator
JPS5384645A (en) Asynchronous signal synchronizing circuit
JPS56159723A (en) Clock switching control system
JPS55105491A (en) Data exchange system
JPS5381057A (en) Phase control system of synchronous oscillating circuit
JPS57166789A (en) Digital signal receiver
JPS53133354A (en) Phase synchronizing circuit