JPS6484935A - System for selecting line - Google Patents

System for selecting line

Info

Publication number
JPS6484935A
JPS6484935A JP62242206A JP24220687A JPS6484935A JP S6484935 A JPS6484935 A JP S6484935A JP 62242206 A JP62242206 A JP 62242206A JP 24220687 A JP24220687 A JP 24220687A JP S6484935 A JPS6484935 A JP S6484935A
Authority
JP
Japan
Prior art keywords
monitoring
selecting
line
inputted
line1
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
JP62242206A
Other languages
Japanese (ja)
Inventor
Yoshio Takeda
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 JP62242206A priority Critical patent/JPS6484935A/en
Publication of JPS6484935A publication Critical patent/JPS6484935A/en
Pending legal-status Critical Current

Links

Landscapes

  • Maintenance And Management Of Digital Transmission (AREA)
  • Detection And Prevention Of Errors In Transmission (AREA)
  • Time-Division Multiplex Systems (AREA)

Abstract

PURPOSE:To automatically selecting-fix a normal line by always monitoring the output of a line selecting part and executing a control so as to select the normal line based on the monitoring result. CONSTITUTION:When a line LINE1 is selected by a line selecting part 3 and connected to a demodulating part 1 and a monitoring part 4, and when the condition of the LINE1 is made abnormal and a receiving signal cannot be detected by the monitoring part 4, pulse signals are intermittently sent from the monitoring part 4, and inputted to a time delaying part 5. A signal in which clock pulses are successive by 5 bits is inputted from the delaying part 5 to an AND gate 7, and a logic product with the clock pulse from an oscillating part 6 is obtained. The output signal of the gate 7 is inputted to a counter part 8, and when the counted value of the clock pulse is >=4 bits, a control signal is outputted from the counter part 8 to the selecting part 3. An LINE2 is selected by the selecting part 3, and connected to the demodulating part 1 and the monitoring part 4. When the LINE2 is abnormal and when the LINEn is abnormal, an LINE3 and the LINE1 are selected in the same way, respectively.
JP62242206A 1987-09-25 1987-09-25 System for selecting line Pending JPS6484935A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62242206A JPS6484935A (en) 1987-09-25 1987-09-25 System for selecting line

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62242206A JPS6484935A (en) 1987-09-25 1987-09-25 System for selecting line

Publications (1)

Publication Number Publication Date
JPS6484935A true JPS6484935A (en) 1989-03-30

Family

ID=17085831

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62242206A Pending JPS6484935A (en) 1987-09-25 1987-09-25 System for selecting line

Country Status (1)

Country Link
JP (1) JPS6484935A (en)

Similar Documents

Publication Publication Date Title
JPS6479687A (en) Time counting circuit
JPS6484935A (en) System for selecting line
JPS6484934A (en) System for selecting line
JPS56143018A (en) Noise rejecting circuit
EP0236108A3 (en) Tacho signal processing
JPS5543422A (en) Electronic timer
JPS5715547A (en) Data receiver
JPS55132960A (en) Amplitude decision circuit
GB1176556A (en) Improvements in Digital Differentiators
JPS55102952A (en) Mutual synchronization system
JPS56129809A (en) Digital adjusting device
JPS57203353A (en) Monitor system for output part of signal channel coder
JPS6222874Y2 (en)
JPS5785586A (en) Speed detecting circuit for motor
JPS536080A (en) Frequency detection circuit
JPS6416121A (en) Digital pll circuit
JPS52133235A (en) Judging circuit
JPS5755437A (en) Interrupting signal detector
JPS55150006A (en) Control timing system
JPS5729148A (en) Arithmetic control system
JPS5463868A (en) Alarm watch
JPS55152625A (en) Detecting device for doze driving
JPS5246871A (en) Device for measurement of automatic phase discriminating allowance
JPS56145412A (en) Interruption signal receiving circuit
JPS55135454A (en) Wave detection circuit