JPS56112163A - Signal transmitting device - Google Patents

Signal transmitting device

Info

Publication number
JPS56112163A
JPS56112163A JP1531880A JP1531880A JPS56112163A JP S56112163 A JPS56112163 A JP S56112163A JP 1531880 A JP1531880 A JP 1531880A JP 1531880 A JP1531880 A JP 1531880A JP S56112163 A JPS56112163 A JP S56112163A
Authority
JP
Japan
Prior art keywords
transmitting
attenuator
receiving
buffer
passes
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
JP1531880A
Other languages
Japanese (ja)
Inventor
Sadao Mizokawa
Hitoshi Fushimi
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP1531880A priority Critical patent/JPS56112163A/en
Publication of JPS56112163A publication Critical patent/JPS56112163A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/42—Loop networks
    • H04L12/437—Ring fault isolation or reconfiguration

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Bidirectional Digital Transmission (AREA)
  • Small-Scale Networks (AREA)
  • Maintenance And Management Of Digital Transmission (AREA)

Abstract

PURPOSE:To enable prompt and easy maintenance by connecting the transmitting side and receiving side through an attenuator that has a preset attenuation characteristic and letting it make self-diagnosis. CONSTITUTION:A switching section 91 is actuated by a signal 21a, and transmission paths 50, 51 are by-passes with a transmission path 52. Further, transmitting and receiving terminals of a transmitting and receiving section 81 are connected through an attenuator 56. At this time, all of switching circuits 11-13 select the receiving side. Predetermined data transmitted from a computer 21 are received through a buffer 4, a transmitting circuit 6, a transmitter 8, an LED10 and a self- loop that passes through the attenuator 56, a photoelectric element 9, a receiver 5 and a buffer 3. In this way diagnosis can be made also on the operation regarding the characteristic such as the amount of attenuation of the transmitting path required to the signal transmitting device, and maintenance can be performed promptyl and easily.
JP1531880A 1980-02-08 1980-02-08 Signal transmitting device Pending JPS56112163A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1531880A JPS56112163A (en) 1980-02-08 1980-02-08 Signal transmitting device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1531880A JPS56112163A (en) 1980-02-08 1980-02-08 Signal transmitting device

Publications (1)

Publication Number Publication Date
JPS56112163A true JPS56112163A (en) 1981-09-04

Family

ID=11885419

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1531880A Pending JPS56112163A (en) 1980-02-08 1980-02-08 Signal transmitting device

Country Status (1)

Country Link
JP (1) JPS56112163A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61150437A (en) * 1984-12-24 1986-07-09 Matsushita Electric Works Ltd Supervisory equipment for signal transmission
US4777330A (en) * 1985-02-15 1988-10-11 Hitachi, Ltd. Network system diagnosis system
JPH0266698A (en) * 1988-08-31 1990-03-06 Hochiki Corp Disaster prevention monitoring device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61150437A (en) * 1984-12-24 1986-07-09 Matsushita Electric Works Ltd Supervisory equipment for signal transmission
US4777330A (en) * 1985-02-15 1988-10-11 Hitachi, Ltd. Network system diagnosis system
JPH0266698A (en) * 1988-08-31 1990-03-06 Hochiki Corp Disaster prevention monitoring device

Similar Documents

Publication Publication Date Title
KR900011169A (en) Computer-controlled speakerphone for communication line adaptation
JPS56112163A (en) Signal transmitting device
JPS56112161A (en) Signal transmitting device
JPS5797113A (en) Control circuit of air conditioner
JPS566550A (en) Data transmission system
GB1030601A (en) Level control device
JPS5726947A (en) Remote test system for data communication line
JPS5289402A (en) Data transmitting device
JPS5773547A (en) Remote monitor and control system
JPS5723129A (en) Information switching device
JPS56112134A (en) Optical signal transmission device
JPS57194658A (en) Guard terminal device
JPS564963A (en) Automatic dial signal transmission system
JPS52153136A (en) Coupler circuit for remote carrier supervisory control device
JPS5779750A (en) Isolation circuit for bidirectional digital signal transmission line
ES461745A1 (en) Receiver/sender
JPS5379407A (en) Terminal equipment for serites type interface
SE7509044L (en) DATA COMMUNICATION SYSTEM
JPS5742212A (en) Mic module
JPS5628530A (en) Terminal equipment in two-way data communication system having transmission signal level automatic control mechanism
JPS53131706A (en) Automatic telephone exchange system
JPS57132455A (en) Communication controlling system
JPS56161757A (en) Guide display method using conventional subscribing telephone line
JPS56120248A (en) Differential reception circuit
JPS54116589A (en) Remote supervisory equipment