JPS55102960A - Signal transmission system - Google Patents

Signal transmission system

Info

Publication number
JPS55102960A
JPS55102960A JP1016479A JP1016479A JPS55102960A JP S55102960 A JPS55102960 A JP S55102960A JP 1016479 A JP1016479 A JP 1016479A JP 1016479 A JP1016479 A JP 1016479A JP S55102960 A JPS55102960 A JP S55102960A
Authority
JP
Japan
Prior art keywords
office
transmission
frequencies
reception
information
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.)
Granted
Application number
JP1016479A
Other languages
Japanese (ja)
Other versions
JPS6151816B2 (en
Inventor
Mutsutake Sanagi
Yoichi Miyazaki
Shuji Katayama
Takeshi Watanabe
Toshio Tanigawa
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
Nippon Telegraph and Telephone Corp
Original Assignee
NEC Corp
Nippon Telegraph and Telephone 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 Telegraph and Telephone Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP1016479A priority Critical patent/JPS55102960A/en
Publication of JPS55102960A publication Critical patent/JPS55102960A/en
Publication of JPS6151816B2 publication Critical patent/JPS6151816B2/ja
Granted legal-status Critical Current

Links

Abstract

PURPOSE: To exercise a supervision over a transmission line by the output of the detection of a specific signal, obtained by combining several frequencies, by a reception office when no information input arrives at the terminal of a transmission office.
CONSTITUTION: Corresponding to information inputs 2∼2''' from transmission office 1, a signal obtained by combining specific frequencies among several frequencies is transmitted to reception office 7 via transmission line 6, and reception office 7 extracts information outputs corresponding to information inputs. Between information inputs 2∼2''' of transmission office 1, and coding part 3, AND circuit 15 is connected and when none of information inputs 2∼2''' arrives, an output is generated by circuit 15 and coded by coding part 3, and frequencies of oscillation parts 4∼4''' are combined and sent to reception office 7. Those combined frequencies are applied to detection circuits 9∼9''' via band-pass filters 8∼8''' of reception office 7 and when a specific frequency is detected, decoding part 10 outputs information outputs 11∼11''' and transmission-line supervisory output 18 is sent out from OR circuit 17.
COPYRIGHT: (C)1980,JPO&Japio
JP1016479A 1979-01-31 1979-01-31 Signal transmission system Granted JPS55102960A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1016479A JPS55102960A (en) 1979-01-31 1979-01-31 Signal transmission system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1016479A JPS55102960A (en) 1979-01-31 1979-01-31 Signal transmission system

Publications (2)

Publication Number Publication Date
JPS55102960A true JPS55102960A (en) 1980-08-06
JPS6151816B2 JPS6151816B2 (en) 1986-11-11

Family

ID=11742635

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1016479A Granted JPS55102960A (en) 1979-01-31 1979-01-31 Signal transmission system

Country Status (1)

Country Link
JP (1) JPS55102960A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5930064U (en) * 1982-08-16 1984-02-24 神田通信工業株式会社 Signal transmission device for elevator equipment

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5930064U (en) * 1982-08-16 1984-02-24 神田通信工業株式会社 Signal transmission device for elevator equipment

Also Published As

Publication number Publication date
JPS6151816B2 (en) 1986-11-11

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