JPS54149505A - Signal transmission system - Google Patents

Signal transmission system

Info

Publication number
JPS54149505A
JPS54149505A JP5756978A JP5756978A JPS54149505A JP S54149505 A JPS54149505 A JP S54149505A JP 5756978 A JP5756978 A JP 5756978A JP 5756978 A JP5756978 A JP 5756978A JP S54149505 A JPS54149505 A JP S54149505A
Authority
JP
Japan
Prior art keywords
signal
converted
converter
series
parallel
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
JP5756978A
Other languages
Japanese (ja)
Inventor
Masaaki Nakazato
Takeo Yuminaka
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 JP5756978A priority Critical patent/JPS54149505A/en
Publication of JPS54149505A publication Critical patent/JPS54149505A/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
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/14—Arrangements for detecting or preventing errors in the information received by using return channel in which the signals are sent back to the transmitter to be checked ; echo systems

Abstract

PURPOSE:To prevent error signal transmission by making a reception side to answer back to a transmission side, by confirming the coincidence between an original transmitting signal and the answer-back signal at the transmission side, and by sending a coincidence signal from the transmission side to reception side when the coincidence is confirmed. CONSTITUTION:Signal switching unit 17 is connected to the A-port side and after the output signal of signal level converter 11 is converted into series one by parallel- series converter 12 and then converted into a photo signal by electrophoto converter 13, series-converted data are transmitted to input-output device 50 via optical-fiber cable 30. In device 50, the data are converted into an electric signal by photoelectric converter 51 and then converted into parallel one by series-parallel converter 52 before being stored temporarily in memory element 58. Since signal switching unit 57 is connected to the B port side in the next period, the data in memory element 58 are converted into series data by parallel-series converter 55 and then converted into an electric signal by electrophoto converter 56, thereby answering back to input-output device 10 via cable 40.
JP5756978A 1978-05-17 1978-05-17 Signal transmission system Pending JPS54149505A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5756978A JPS54149505A (en) 1978-05-17 1978-05-17 Signal transmission system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5756978A JPS54149505A (en) 1978-05-17 1978-05-17 Signal transmission system

Publications (1)

Publication Number Publication Date
JPS54149505A true JPS54149505A (en) 1979-11-22

Family

ID=13059464

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5756978A Pending JPS54149505A (en) 1978-05-17 1978-05-17 Signal transmission system

Country Status (1)

Country Link
JP (1) JPS54149505A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5875337A (en) * 1981-10-30 1983-05-07 Hitachi Ltd Direction matching system of data communication system
JPS6177450A (en) * 1984-09-22 1986-04-21 Nec Corp Interface converter
JPS6283734A (en) * 1985-10-08 1987-04-17 Canon Inc Camera

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5875337A (en) * 1981-10-30 1983-05-07 Hitachi Ltd Direction matching system of data communication system
JPH043139B2 (en) * 1981-10-30 1992-01-22
JPS6177450A (en) * 1984-09-22 1986-04-21 Nec Corp Interface converter
JPH0426263B2 (en) * 1984-09-22 1992-05-06 Nippon Electric Co
JPS6283734A (en) * 1985-10-08 1987-04-17 Canon Inc Camera

Similar Documents

Publication Publication Date Title
SE7700114L (en) DATA TRANSMISSION SYSTEM
ES8401271A1 (en) Data transmission system.
JPS54149505A (en) Signal transmission system
JPS5383760A (en) Branching method for optical transmission
JPS56138346A (en) Control system for multipoint line
JPS5326640A (en) Single-cable separate group transmission system
JPS52137915A (en) Data transmission system
JPS5613850A (en) Secondary signal piling transmission system
JPS5216909A (en) Data transmission and reception device
JPS5340205A (en) Charging pulse transmission system
JPS5537013A (en) Facsimile device
JPS57193150A (en) Self-diagnostic system for two line type transmission line
JPS5664526A (en) Multiplex transmission system by optical pulse of measured value
JPS5635567A (en) Facsimile system
JPS54116589A (en) Remote supervisory equipment
JPS52109318A (en) Data transmitting system utilized multi-vector signal method
JPS5336110A (en) Data transfer system
JPS5354680A (en) Electric signal transmission device
JPS57143956A (en) Mutual communication system between half duplex and full duplex terminal
JPS57138240A (en) Hairpin network
JPS5718141A (en) Two-way signal transmission device
JPS553220A (en) Signal transmission/reception system
JPS56157169A (en) Called subscriber answering system of data transmission system
JPS5698059A (en) Communication control device
JPS5226130A (en) Data transmission system between control devices in information proces sing unit