JPS5787268A - Telephone system - Google Patents

Telephone system

Info

Publication number
JPS5787268A
JPS5787268A JP55161898A JP16189880A JPS5787268A JP S5787268 A JPS5787268 A JP S5787268A JP 55161898 A JP55161898 A JP 55161898A JP 16189880 A JP16189880 A JP 16189880A JP S5787268 A JPS5787268 A JP S5787268A
Authority
JP
Japan
Prior art keywords
circuit
terminals
terminal
trunk
extension
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
JP55161898A
Other languages
Japanese (ja)
Other versions
JPS6317266B2 (en
Inventor
Shigeyuki Mizukoshi
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.)
Iwatsu Electric Co Ltd
Iwasaki Tsushinki KK
Original Assignee
Iwatsu Electric Co Ltd
Iwasaki Tsushinki 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 Iwatsu Electric Co Ltd, Iwasaki Tsushinki KK filed Critical Iwatsu Electric Co Ltd
Priority to JP55161898A priority Critical patent/JPS5787268A/en
Publication of JPS5787268A publication Critical patent/JPS5787268A/en
Publication of JPS6317266B2 publication Critical patent/JPS6317266B2/ja
Granted 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)
  • Sub-Exchange Stations And Push- Button Telephones (AREA)

Abstract

PURPOSE:To connect an extension telephone set and a trunk by a simple circuit configuration, by changing the connection of a talking circuit to a trunk side when it has been made holding against the trunk, so that general calling to other telephone sets can be executed through the extension by a transmitter of a channel. CONSTITUTION:A voice output by a caller is inputted to a talking circuit 1 from a terminal T1, and is outputted between its terminal T2 and T3, and is sent to terminals L1, L2. Subsequently, when a switch S is depressed, the side (a) of contacts S1-S3 becomes a conducting state, and a DC loop across the terminals L1, L2 is held by a holding circuit 3. As a result, a DC power course VB is supplied to the circuit 1 from a terminal L3. In this way, an output of a transmitter from the terminal T1 is outputted to terminals L2, L4 through an extension circuit 2, and a signal can be transmitted to other telephone set connected to these terminals L2, L4. Accordingly, a call from a trunk is transferred by depressing the switch S, executing a general calling of a voice to other telephone sets of the extension, and having a transmitter and receiver take up in other telephone set.
JP55161898A 1980-11-19 1980-11-19 Telephone system Granted JPS5787268A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55161898A JPS5787268A (en) 1980-11-19 1980-11-19 Telephone system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55161898A JPS5787268A (en) 1980-11-19 1980-11-19 Telephone system

Publications (2)

Publication Number Publication Date
JPS5787268A true JPS5787268A (en) 1982-05-31
JPS6317266B2 JPS6317266B2 (en) 1988-04-13

Family

ID=15744104

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55161898A Granted JPS5787268A (en) 1980-11-19 1980-11-19 Telephone system

Country Status (1)

Country Link
JP (1) JPS5787268A (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5193803A (en) * 1975-02-17 1976-08-17

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5193803A (en) * 1975-02-17 1976-08-17

Also Published As

Publication number Publication date
JPS6317266B2 (en) 1988-04-13

Similar Documents

Publication Publication Date Title
SE8403631D0 (en) TRANSFER OF DATA CALLS
JPS6473844A (en) Radio communication equipment
FR2452842A1 (en) Telephone terminal including calculators - combines both functions of normal subscriber telephone and an information transmission terminal
JPS5787268A (en) Telephone system
JPS54114011A (en) Loudspeaker telephone device
FR2423096A1 (en) Ringing circuit for centrally controlled telephone exchange junction - has alternating signal source, and bipolar electronic switch output connected to subscriber and timer
GB1452254A (en) Circuit arrangement for a tone pushbutton selection telephone subscriber set
JPS5733843A (en) Echo cancelling device
JPS5671344A (en) Car telephone with speaker
JPS5787269A (en) Telephone set circuit
JPS57113670A (en) Telephone set
JPS57173251A (en) Voice switch circuit
JPS5643859A (en) Polarity-inversion-signal detecting circuit
JPS5478005A (en) Subscribersigma line control system
JPS5689159A (en) Speaker switching telephone system
JPS56149856A (en) Ring-back tone and call signal sending system
JPS57121360A (en) Two-wire interphone
JPS5570194A (en) Night main wire switching system
JPS56132842A (en) Communication speed matching system
JPS5329605A (en) Hand-free telephone set
JPS5245808A (en) Switchboard telephone circuit
JPS5358702A (en) Signal selecting/sending system
JPS56123138A (en) Cordless telephone set
JPS5486206A (en) Call pickup system
JPS5647156A (en) Conference telephone release system