JPS5691563A - Polarity inversion control system of communication controller - Google Patents

Polarity inversion control system of communication controller

Info

Publication number
JPS5691563A
JPS5691563A JP16902279A JP16902279A JPS5691563A JP S5691563 A JPS5691563 A JP S5691563A JP 16902279 A JP16902279 A JP 16902279A JP 16902279 A JP16902279 A JP 16902279A JP S5691563 A JPS5691563 A JP S5691563A
Authority
JP
Japan
Prior art keywords
logic
polarity
polarity inversion
inversion control
output
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
JP16902279A
Other languages
Japanese (ja)
Other versions
JPS5935223B2 (en
Inventor
Kunio Sato
Kanji 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 JP54169022A priority Critical patent/JPS5935223B2/en
Publication of JPS5691563A publication Critical patent/JPS5691563A/en
Publication of JPS5935223B2 publication Critical patent/JPS5935223B2/en
Expired 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
    • H04L12/02—Details

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Communication Control (AREA)

Abstract

PURPOSE:To eliminate the logic gate of a polarity inversion control part by inverting the polarity of only a transmission data line, held in a space state in power feed, only during the 1st data link establishment, by using a function of transmitting and receiving a length mark and length space. CONSTITUTION:In power feed, the output of bit holding circuit 2 is held at logic ''1'' and that of polarity inversion control circuit 3 at logic ''0''. Therefore, the output of AND gate 20 is at logic ''0'' and that of transmitting circuit 5 has the space polarity. After the power feed, the output of polarity inversion control circuit 3 is changed from logic ''0'' to ''1''. Consequently, the output of AND gate 20 has logic ''1'', and that of transmitting circuit 5 has the mark polarity. On the other hand, when a terminal side detects the polarity inversion of the center side, the polarity of reception data line 15 at the center side is inverted. The center detects a long mark to set up a data link. On the completion of data from the center, long space transmission is carried out via transmission data line 16.
JP54169022A 1979-12-25 1979-12-25 Polarity reversal control method for communication control equipment Expired JPS5935223B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP54169022A JPS5935223B2 (en) 1979-12-25 1979-12-25 Polarity reversal control method for communication control equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP54169022A JPS5935223B2 (en) 1979-12-25 1979-12-25 Polarity reversal control method for communication control equipment

Publications (2)

Publication Number Publication Date
JPS5691563A true JPS5691563A (en) 1981-07-24
JPS5935223B2 JPS5935223B2 (en) 1984-08-27

Family

ID=15878868

Family Applications (1)

Application Number Title Priority Date Filing Date
JP54169022A Expired JPS5935223B2 (en) 1979-12-25 1979-12-25 Polarity reversal control method for communication control equipment

Country Status (1)

Country Link
JP (1) JPS5935223B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5954355A (en) * 1982-09-22 1984-03-29 Sanyo Electric Co Ltd Data transfer system
JPS5963844A (en) * 1982-10-04 1984-04-11 Sanyo Electric Co Ltd Transferring method of data

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5954355A (en) * 1982-09-22 1984-03-29 Sanyo Electric Co Ltd Data transfer system
JPS5963844A (en) * 1982-10-04 1984-04-11 Sanyo Electric Co Ltd Transferring method of data

Also Published As

Publication number Publication date
JPS5935223B2 (en) 1984-08-27

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