JPS6458149A - Digital radio transmission system - Google Patents

Digital radio transmission system

Info

Publication number
JPS6458149A
JPS6458149A JP21459787A JP21459787A JPS6458149A JP S6458149 A JPS6458149 A JP S6458149A JP 21459787 A JP21459787 A JP 21459787A JP 21459787 A JP21459787 A JP 21459787A JP S6458149 A JPS6458149 A JP S6458149A
Authority
JP
Japan
Prior art keywords
fault
demodulator
occurrence
modulator
station
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
JP21459787A
Other languages
Japanese (ja)
Inventor
Hideki Akaha
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 JP21459787A priority Critical patent/JPS6458149A/en
Publication of JPS6458149A publication Critical patent/JPS6458149A/en
Pending legal-status Critical Current

Links

Landscapes

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

Abstract

PURPOSE:To notice the occurrence of a fault to a subsequent station by inhibiting a demodulation clock input to a modulator at a fault of demodulator. CONSTITUTION:A demodulator alarm detecting circuit D detects a fault caused in a demodulator and closes a gate G at the occurrence of a fault. Demodulation data S1-S4 are fed to a modulator MOD even at the occurrence of a fault and since no clock is inputted, the modulator applies no modulation and a transmission signal from a fault station is only a carrier. The subsequent station receives it and a faulty state of a host station is recognized.
JP21459787A 1987-08-28 1987-08-28 Digital radio transmission system Pending JPS6458149A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP21459787A JPS6458149A (en) 1987-08-28 1987-08-28 Digital radio transmission system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP21459787A JPS6458149A (en) 1987-08-28 1987-08-28 Digital radio transmission system

Publications (1)

Publication Number Publication Date
JPS6458149A true JPS6458149A (en) 1989-03-06

Family

ID=16658353

Family Applications (1)

Application Number Title Priority Date Filing Date
JP21459787A Pending JPS6458149A (en) 1987-08-28 1987-08-28 Digital radio transmission system

Country Status (1)

Country Link
JP (1) JPS6458149A (en)

Similar Documents

Publication Publication Date Title
JPS5631231A (en) Phase locked loop circuit
JPS6471326A (en) Method of demodulating bi-phase signal
CA2029675A1 (en) Carrier regenerating device correctly operable in mobile satellite communication
JPS5792948A (en) Loop data transmission system
IE792125L (en) Clock rate recovery circuit
JPS6458149A (en) Digital radio transmission system
HUT44881A (en) Circuit arrangement for resynchronizing broad band digital signals
ES8105535A1 (en) Switching circuit for two digital streams.
JPS537352A (en) Data collection system in digital telemeter system
GB1392546A (en) Binary data communication apparatus
JPS5742248A (en) Switching device for communication system
JPS5763953A (en) Facsimile transmission control system
JPS57136845A (en) Coding and transfer system of information data
JPS56157150A (en) Composite digital communication system
JPS6468142A (en) Modulator/demodulator
JPS5467711A (en) Receiving data signal generator circuit
JPS57129048A (en) Loop data transmitting device
JPS57132478A (en) Decoding system for variable length code
JPS56104556A (en) Digital transmission system
JP3123245B2 (en) Demodulation method and demodulation circuit using the demodulation method
JPS57185749A (en) Method and apparatus for self-test of modulation and demodulation device
JPS5218346A (en) Center-failure detecting system
JPS53104149A (en) Demodulating system for phase modulation data signal
JPS56100553A (en) Signal demodulation system
JPS5222836A (en) Abnormality detecting and disposing system for communication system