JPS5636294A - Line start detecting system - Google Patents

Line start detecting system

Info

Publication number
JPS5636294A
JPS5636294A JP11254179A JP11254179A JPS5636294A JP S5636294 A JPS5636294 A JP S5636294A JP 11254179 A JP11254179 A JP 11254179A JP 11254179 A JP11254179 A JP 11254179A JP S5636294 A JPS5636294 A JP S5636294A
Authority
JP
Japan
Prior art keywords
timing
line start
loop
line
subscriber
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
JP11254179A
Other languages
Japanese (ja)
Inventor
Susumu Enokido
Hishiichi Komiya
Tomoji Inoue
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.)
NEC Corp
Nippon Telegraph and Telephone Corp
Original Assignee
NEC Corp
Nippon Telegraph and Telephone Corp
Nippon Electric Co 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 NEC Corp, Nippon Telegraph and Telephone Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP11254179A priority Critical patent/JPS5636294A/en
Publication of JPS5636294A publication Critical patent/JPS5636294A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M11/00—Telephonic communication systems specially adapted for combination with other electrical systems
    • H04M11/06—Simultaneous speech and data transmission, e.g. telegraphic transmission over the same conductors

Abstract

PURPOSE:To make it possible to enter for data communicaion comparatively easily even if an expensive data exchange is not installed, by providing two timing citcuits in the line start detecting circuit of the subscriber's circuit connected to the exchange. CONSTITUTION:Two timing circuits are provided in the line start detecting circuit of the subscriber's circuit connected to telephone exchange SW, and line start is detected by completion of closure of the loop of the line within the second timing T2 after the first timing T1. For example, when the data communication terminal unit closes instantaneously the loop for originating, it is detected by the photo coupler light emission-side element, and the light receiving side is turned on, and charge of capacitor C is discharged through resistance R1, and monostable multivibrator MMO is started at point (b) after timing T1 and issues the output during timing T2. If closure of the loop is completed within timing T2, photo coupler PT is turned off, and monostable multivibrator MM1 is started through the NAND element at point (c), and line relay DL for data communication subscriber is operated.
JP11254179A 1979-09-03 1979-09-03 Line start detecting system Pending JPS5636294A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11254179A JPS5636294A (en) 1979-09-03 1979-09-03 Line start detecting system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11254179A JPS5636294A (en) 1979-09-03 1979-09-03 Line start detecting system

Publications (1)

Publication Number Publication Date
JPS5636294A true JPS5636294A (en) 1981-04-09

Family

ID=14589219

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11254179A Pending JPS5636294A (en) 1979-09-03 1979-09-03 Line start detecting system

Country Status (1)

Country Link
JP (1) JPS5636294A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6158955A (en) * 1984-05-30 1986-03-26 エ−イ−・ピ−エルシ− Manufacture of piston

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6158955A (en) * 1984-05-30 1986-03-26 エ−イ−・ピ−エルシ− Manufacture of piston

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