JPS57129048A - Loop data transmitting device - Google Patents

Loop data transmitting device

Info

Publication number
JPS57129048A
JPS57129048A JP56014253A JP1425381A JPS57129048A JP S57129048 A JPS57129048 A JP S57129048A JP 56014253 A JP56014253 A JP 56014253A JP 1425381 A JP1425381 A JP 1425381A JP S57129048 A JPS57129048 A JP S57129048A
Authority
JP
Japan
Prior art keywords
data
station
signal
pll
stations
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
JP56014253A
Other languages
Japanese (ja)
Inventor
Sadao Mizokawa
Masahiro Takahashi
Seiichi Yasumoto
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 JP56014253A priority Critical patent/JPS57129048A/en
Publication of JPS57129048A publication Critical patent/JPS57129048A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/42—Loop networks
    • H04L12/422—Synchronisation for ring networks

Abstract

PURPOSE:To prevent an output of an erroneous receiving data due to cut-off of an input signal, by providing a means for detecting the periodicity of a receiving data, and a means for detecting the synchronization of a PLL circuit, on a station having the PLL circuit for reproducing a clock signal from a received data. CONSTITUTION:Plural stations 1-6 are connected so as to constitute a closed loop of a common bus 7. On one station being a master station, a clock generator which becomes the base for transmitting and sending a data is provided, and also on other stations, PLL for reproducing a clock signal is provided. In order to prevent sending out an erroneous output signal even when each station is in a state that no signal is inputted, a control means for stopping sending out a data for a prescribed time when an input signal has lost the periodicity, and allowing to send out a data in case the PLL is in a synchronizing state after the prescribed time has passed is provided on the stations except the master station.
JP56014253A 1981-02-04 1981-02-04 Loop data transmitting device Pending JPS57129048A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56014253A JPS57129048A (en) 1981-02-04 1981-02-04 Loop data transmitting device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56014253A JPS57129048A (en) 1981-02-04 1981-02-04 Loop data transmitting device

Publications (1)

Publication Number Publication Date
JPS57129048A true JPS57129048A (en) 1982-08-10

Family

ID=11855923

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56014253A Pending JPS57129048A (en) 1981-02-04 1981-02-04 Loop data transmitting device

Country Status (1)

Country Link
JP (1) JPS57129048A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4593154A (en) * 1983-07-08 1986-06-03 Nissan Motor Company, Limited Loop-type data transmission/reception network
JPH01260944A (en) * 1988-04-12 1989-10-18 Canon Inc Communication terminal equipment

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4593154A (en) * 1983-07-08 1986-06-03 Nissan Motor Company, Limited Loop-type data transmission/reception network
JPH01260944A (en) * 1988-04-12 1989-10-18 Canon Inc Communication terminal equipment

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