JPS6335148B2 - - Google Patents

Info

Publication number
JPS6335148B2
JPS6335148B2 JP18446380A JP18446380A JPS6335148B2 JP S6335148 B2 JPS6335148 B2 JP S6335148B2 JP 18446380 A JP18446380 A JP 18446380A JP 18446380 A JP18446380 A JP 18446380A JP S6335148 B2 JPS6335148 B2 JP S6335148B2
Authority
JP
Japan
Prior art keywords
signal
polarity
relay
call
coin
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.)
Expired
Application number
JP18446380A
Other languages
English (en)
Japanese (ja)
Other versions
JPS57107672A (en
Inventor
Sadao Saito
Hiroshi Osada
Junji Nakada
Hideaki Teramura
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.)
Nippon Telegraph and Telephone Corp
Tamura Electric Works Ltd
Original Assignee
Nippon Telegraph and Telephone Corp
Tamura Electric Works 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 Nippon Telegraph and Telephone Corp, Tamura Electric Works Ltd filed Critical Nippon Telegraph and Telephone Corp
Priority to JP18446380A priority Critical patent/JPS57107672A/ja
Publication of JPS57107672A publication Critical patent/JPS57107672A/ja
Publication of JPS6335148B2 publication Critical patent/JPS6335148B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M17/00—Prepayment of wireline communication systems, wireless communication systems or telephone systems
    • H04M17/02—Coin-freed or check-freed systems, e.g. mobile- or card-operated phones, public telephones or booths
    • H04M17/023—Circuit arrangements

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Computer Security & Cryptography (AREA)
  • Signal Processing (AREA)
  • Prepayment Telephone Systems (AREA)
JP18446380A 1980-12-25 1980-12-25 Public telephone circuit Granted JPS57107672A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP18446380A JPS57107672A (en) 1980-12-25 1980-12-25 Public telephone circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP18446380A JPS57107672A (en) 1980-12-25 1980-12-25 Public telephone circuit

Publications (2)

Publication Number Publication Date
JPS57107672A JPS57107672A (en) 1982-07-05
JPS6335148B2 true JPS6335148B2 (enrdf_load_stackoverflow) 1988-07-13

Family

ID=16153587

Family Applications (1)

Application Number Title Priority Date Filing Date
JP18446380A Granted JPS57107672A (en) 1980-12-25 1980-12-25 Public telephone circuit

Country Status (1)

Country Link
JP (1) JPS57107672A (enrdf_load_stackoverflow)

Also Published As

Publication number Publication date
JPS57107672A (en) 1982-07-05

Similar Documents

Publication Publication Date Title
US3436488A (en) Line circuit for a key telephone system utilizing a single multifunction supervisory relay
US4001520A (en) Hold circuit for telephones
US3760101A (en) Coin telephone circuit
US3946146A (en) Discrete ringing detector for use in key telephone systems
JPS6335148B2 (enrdf_load_stackoverflow)
US3374317A (en) Telephone signaling system
JPS6318205Y2 (enrdf_load_stackoverflow)
JPS6328385B2 (enrdf_load_stackoverflow)
US3649772A (en) Line card circuit for a key telephone system
JPS6039970A (ja) 極性反転検出回路
US3046341A (en) Postpay paystation circuit providing special service
JPS6342606Y2 (enrdf_load_stackoverflow)
JPS6312608Y2 (enrdf_load_stackoverflow)
JPS6325792Y2 (enrdf_load_stackoverflow)
JPS61251266A (ja) 公衆電話機の話中音送出回路
JPS61201557A (ja) 公衆電話機
US4445004A (en) Key telephone line circuit with improved hold circuit
JPH0127316Y2 (enrdf_load_stackoverflow)
CA1173576A (en) Key telephone line circuit
US3748404A (en) Telephone line circuit embodying a triggerable avalanche device
JPH0453087Y2 (enrdf_load_stackoverflow)
JPH0246141Y2 (enrdf_load_stackoverflow)
JPH0218621Y2 (enrdf_load_stackoverflow)
JPS6325793Y2 (enrdf_load_stackoverflow)
JP2767680B2 (ja) ボタン電話装置