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JPS56149132A - Transmission system utilizing stand-by transmission line effectively - Google Patents

Transmission system utilizing stand-by transmission line effectively

Info

Publication number
JPS56149132A
JPS56149132A JP5176980A JP5176980A JPS56149132A JP S56149132 A JPS56149132 A JP S56149132A JP 5176980 A JP5176980 A JP 5176980A JP 5176980 A JP5176980 A JP 5176980A JP S56149132 A JPS56149132 A JP S56149132A
Authority
JP
Japan
Prior art keywords
transmission
transmission line
stand
output
multiplex carrier
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
JP5176980A
Other languages
Japanese (ja)
Inventor
Masao Kodama
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
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 Electric Co Ltd filed Critical NEC Corp
Priority to JP5176980A priority Critical patent/JPS56149132A/en
Publication of JPS56149132A publication Critical patent/JPS56149132A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/74—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission for increasing reliability, e.g. using redundant or spare channels or apparatus

Landscapes

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

Abstract

PURPOSE:To improve the reliability of a system including the transmission line between multiplex carrier devices and to utilize a stand-by transmission line, by connecting in-use and stand-by transmission line as the transmission line between multiplex carrier devices through the switching of a switching circuit. CONSTITUTION:The transmission output of multiplex carrier device 1 having transmission band f1 is passed through branching circuit 2 and one output is led to the transmission side of in-use transmission line 9 to be sent to the opposite side. The other output is inputted to integrating circuit 6 and mixed with the transmission output of multiplex carrier device 5, and the resulting mixture signal is led to the transmission side of stand-by transmission line 10 to be sent to the opposite-side terminal. At the opposite reception side, on the other hand, the reception output of transmission line 9 is passed through switching circuit 3 which selects either one of in-use and stand-by transmission lines and supplied to the reception input side of multiplex carrier device 4 with transmission band f2. Thus, the in-use and stand-by transmissions are used by being switched to improve the reliability of the system including the transmission lines between the multiplex carrier devices and also to utilize the stand-by transmission line.
JP5176980A 1980-04-21 1980-04-21 Transmission system utilizing stand-by transmission line effectively Pending JPS56149132A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5176980A JPS56149132A (en) 1980-04-21 1980-04-21 Transmission system utilizing stand-by transmission line effectively

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5176980A JPS56149132A (en) 1980-04-21 1980-04-21 Transmission system utilizing stand-by transmission line effectively

Publications (1)

Publication Number Publication Date
JPS56149132A true JPS56149132A (en) 1981-11-18

Family

ID=12896148

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5176980A Pending JPS56149132A (en) 1980-04-21 1980-04-21 Transmission system utilizing stand-by transmission line effectively

Country Status (1)

Country Link
JP (1) JPS56149132A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60109932A (en) * 1983-11-18 1985-06-15 Fujitsu Ltd Line switching method
JPH0385983A (en) * 1989-08-30 1991-04-11 C Ee T V Kiban Gijutsu Kenkyusho:Kk Duplex communication system
US5648676A (en) * 1990-09-10 1997-07-15 Fujitsu Limited Semiconductor device with protective element

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60109932A (en) * 1983-11-18 1985-06-15 Fujitsu Ltd Line switching method
JPH0140535B2 (en) * 1983-11-18 1989-08-29 Fujitsu Ltd
JPH0385983A (en) * 1989-08-30 1991-04-11 C Ee T V Kiban Gijutsu Kenkyusho:Kk Duplex communication system
US5648676A (en) * 1990-09-10 1997-07-15 Fujitsu Limited Semiconductor device with protective element
US5670885A (en) * 1990-09-10 1997-09-23 Fujitsu Limited Semiconductor device

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