JPS5590167A - Circuit switching system of terminal telephone set - Google Patents

Circuit switching system of terminal telephone set

Info

Publication number
JPS5590167A
JPS5590167A JP15990978A JP15990978A JPS5590167A JP S5590167 A JPS5590167 A JP S5590167A JP 15990978 A JP15990978 A JP 15990978A JP 15990978 A JP15990978 A JP 15990978A JP S5590167 A JPS5590167 A JP S5590167A
Authority
JP
Japan
Prior art keywords
duplexer
communication circuit
circuit
stand
circuits
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
JP15990978A
Other languages
Japanese (ja)
Inventor
Yasuyuki Horimuki
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 Denshi KK
Original Assignee
Hitachi Denshi KK
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 Denshi KK filed Critical Hitachi Denshi KK
Priority to JP15990978A priority Critical patent/JPS5590167A/en
Publication of JPS5590167A publication Critical patent/JPS5590167A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/71—Substation extension arrangements

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)

Abstract

PURPOSE:To make it possible to use two circuits independently by making a switching connection between two circuits by one duplexer normally and then by using a stand-by duplexer inserted into a jack provided to one circuit at the time of call convergence. CONSTITUTION:When a signal from either communication circuit 1 or 2 is inputted in normal mode, duplexer 11 is connected by switching to the communication circuit by incoming display of incoming display unit 3 or 4. Here, since one duplexer 11 is shared, the input of a signal from the unused communication circuit results in that the communication circuit is not constituted. In case of call convergence like this, switchs 5 and 6 are switched to the communication circuit 2 side and a stand-by duplexer is inserted into jack 7 provided to this circuit. At this time, contacts 9 and 10 of relay 8 operate through the operation of relay 8 to constitute a talking circuit between communication circuit 1 and duplexer 11 and that between communication circuit 2 and the stand-by duplexer, so that two communication circuits can be used independently.
JP15990978A 1978-12-27 1978-12-27 Circuit switching system of terminal telephone set Pending JPS5590167A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15990978A JPS5590167A (en) 1978-12-27 1978-12-27 Circuit switching system of terminal telephone set

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15990978A JPS5590167A (en) 1978-12-27 1978-12-27 Circuit switching system of terminal telephone set

Publications (1)

Publication Number Publication Date
JPS5590167A true JPS5590167A (en) 1980-07-08

Family

ID=15703808

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15990978A Pending JPS5590167A (en) 1978-12-27 1978-12-27 Circuit switching system of terminal telephone set

Country Status (1)

Country Link
JP (1) JPS5590167A (en)

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