JPS55161447A - Data transmission system - Google Patents

Data transmission system

Info

Publication number
JPS55161447A
JPS55161447A JP6839079A JP6839079A JPS55161447A JP S55161447 A JPS55161447 A JP S55161447A JP 6839079 A JP6839079 A JP 6839079A JP 6839079 A JP6839079 A JP 6839079A JP S55161447 A JPS55161447 A JP S55161447A
Authority
JP
Japan
Prior art keywords
synchronizing signal
signal
clock
frame synchronizing
transmission line
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
JP6839079A
Other languages
Japanese (ja)
Inventor
Tokihiro Mishiro
Hideji Suzuki
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 JP6839079A priority Critical patent/JPS55161447A/en
Publication of JPS55161447A publication Critical patent/JPS55161447A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L7/00—Arrangements for synchronising receiver with transmitter
    • H04L7/04—Speed or phase control by synchronisation signals
    • H04L7/041—Speed or phase control by synchronisation signals using special codes as synchronising signal
    • H04L7/044—Speed or phase control by synchronisation signals using special codes as synchronising signal using a single bit, e.g. start stop bit

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Synchronisation In Digital Transmission Systems (AREA)

Abstract

PURPOSE:To reduce the cost of the transmission line and the terminal station, by transmitting the data signal and the clock signal including the frame synchronizing signal to one transmission line and the other respectively and by separating the clock signal and the frame synchronizing signal in the receiving side. CONSTITUTION:A synchronizing signal provided with a pulse lack part or addition part correspondingly to the frame synchronizing signal is generated for the clock signal consisting of a continuous clock pulse train by synchronizing signal generating circuit 14 of transmission part 1, and the pulse lack part or addition part is detected from the synchronizing signal by synchronizing separating circuit 21 of receiving part 2 to separate and reproduce the clock signal and the frame synchronizing signal. In separation, the trigger input to a retriggerrable timer where the holding time is longer than one clock pulse period and is shorter than two clock pulse periods is used as the synchronizing signal, and the timer output is used as the frame synchronizing signal. As the result, since the frame synchronizing signal and the clock signal can be transmitted by one transmission line, constitution is simplified.
JP6839079A 1979-05-31 1979-05-31 Data transmission system Pending JPS55161447A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6839079A JPS55161447A (en) 1979-05-31 1979-05-31 Data transmission system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6839079A JPS55161447A (en) 1979-05-31 1979-05-31 Data transmission system

Publications (1)

Publication Number Publication Date
JPS55161447A true JPS55161447A (en) 1980-12-16

Family

ID=13372330

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6839079A Pending JPS55161447A (en) 1979-05-31 1979-05-31 Data transmission system

Country Status (1)

Country Link
JP (1) JPS55161447A (en)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2508253A1 (en) * 1981-06-22 1982-12-24 Telephonie Ind Commerciale Clock signal generating and synchronising circuit - has counter summing data pulses from clock signal with reset pulse half period out of phase
JPS6031394A (en) * 1983-08-01 1985-02-18 Meisei Electric Co Ltd Synchronizing system of key telephone set
JPS6068745A (en) * 1983-09-26 1985-04-19 Oki Electric Ind Co Ltd Exchange system of digital data transmission line
JPS60112572A (en) * 1983-10-27 1985-06-19 オーチス　エレベータ　コムパニー Elevator control system which can be changed into modulus
JPS61182344A (en) * 1985-02-08 1986-08-15 Fujitsu Ltd Transmission system of synchronizing clock
JPS622731A (en) * 1985-06-28 1987-01-08 Nec Corp External synchronizing transmission system
JPH01143435A (en) * 1987-11-30 1989-06-06 Nec Corp Data transmission equipment
JPH01144832A (en) * 1987-12-01 1989-06-07 Nec Corp Timing information optical parallel-transmission system
JPH02112342A (en) * 1988-10-21 1990-04-25 Nec Corp Frame superimposing clock distributor
JPH02260734A (en) * 1989-03-30 1990-10-23 Nec Corp Serial data transmission system

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2508253A1 (en) * 1981-06-22 1982-12-24 Telephonie Ind Commerciale Clock signal generating and synchronising circuit - has counter summing data pulses from clock signal with reset pulse half period out of phase
JPS6031394A (en) * 1983-08-01 1985-02-18 Meisei Electric Co Ltd Synchronizing system of key telephone set
JPS6068745A (en) * 1983-09-26 1985-04-19 Oki Electric Ind Co Ltd Exchange system of digital data transmission line
JPS60112572A (en) * 1983-10-27 1985-06-19 オーチス　エレベータ　コムパニー Elevator control system which can be changed into modulus
JPS61182344A (en) * 1985-02-08 1986-08-15 Fujitsu Ltd Transmission system of synchronizing clock
JPS622731A (en) * 1985-06-28 1987-01-08 Nec Corp External synchronizing transmission system
JPH01143435A (en) * 1987-11-30 1989-06-06 Nec Corp Data transmission equipment
JPH01144832A (en) * 1987-12-01 1989-06-07 Nec Corp Timing information optical parallel-transmission system
JPH02112342A (en) * 1988-10-21 1990-04-25 Nec Corp Frame superimposing clock distributor
JPH02260734A (en) * 1989-03-30 1990-10-23 Nec Corp Serial data transmission system

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