JPS6465934A - Line switching device - Google Patents

Line switching device

Info

Publication number
JPS6465934A
JPS6465934A JP22284487A JP22284487A JPS6465934A JP S6465934 A JPS6465934 A JP S6465934A JP 22284487 A JP22284487 A JP 22284487A JP 22284487 A JP22284487 A JP 22284487A JP S6465934 A JPS6465934 A JP S6465934A
Authority
JP
Japan
Prior art keywords
line
control part
level
error
detects
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
JP22284487A
Other languages
Japanese (ja)
Inventor
Takeo Anzai
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
Original Assignee
NEC Corp
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 filed Critical NEC Corp
Priority to JP22284487A priority Critical patent/JPS6465934A/en
Publication of JPS6465934A publication Critical patent/JPS6465934A/en
Pending legal-status Critical Current

Links

Landscapes

  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)

Abstract

PURPOSE:To obtain a line switching device which does not deteriorate a quality for high speed data transmission, by providing an interface switching switch, a line level monitor circuit and a control part. CONSTITUTION:When the level monitoring circuit 8 detects the level-down of an private line, and its monitoring output 9 is changed, the control part 11 performs an automatic dial call originating control for a line terminal equipment 12 and modulating/demodulating devices 13-1-13-3, when the level monitoring output 9 continues said state longer than prescribed time. After the respective lines are set up by the automatic dial call originating, the control part 11 receives a prescribed digital signal to be transmitted followingly from a remote station, for prescribed time, and detects the presence and absence of the error of a code. Then, when there is no error, it controls an interface switching switch 5, for the first time, to switch interfaces 1-4 to the terminal equipment so as to come to a back-up line side, i.e., the control part 11 side.
JP22284487A 1987-09-05 1987-09-05 Line switching device Pending JPS6465934A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP22284487A JPS6465934A (en) 1987-09-05 1987-09-05 Line switching device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP22284487A JPS6465934A (en) 1987-09-05 1987-09-05 Line switching device

Publications (1)

Publication Number Publication Date
JPS6465934A true JPS6465934A (en) 1989-03-13

Family

ID=16788790

Family Applications (1)

Application Number Title Priority Date Filing Date
JP22284487A Pending JPS6465934A (en) 1987-09-05 1987-09-05 Line switching device

Country Status (1)

Country Link
JP (1) JPS6465934A (en)

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