CA1136784A - Office line connection circuit during service interruptions in key telephone apparatus - Google Patents

Office line connection circuit during service interruptions in key telephone apparatus

Info

Publication number
CA1136784A
CA1136784A CA000326739A CA326739A CA1136784A CA 1136784 A CA1136784 A CA 1136784A CA 000326739 A CA000326739 A CA 000326739A CA 326739 A CA326739 A CA 326739A CA 1136784 A CA1136784 A CA 1136784A
Authority
CA
Canada
Prior art keywords
station set
key telephone
relay means
key
group
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
CA000326739A
Other languages
English (en)
French (fr)
Inventor
Setsuo Oshima
Tsuyoshi Shinoi
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 Tsushin Kogyo KK
Tie Communications Inc
Original Assignee
Nippon Tsushin Kogyo KK
Tie Communications Inc
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 Tsushin Kogyo KK, Tie Communications Inc filed Critical Nippon Tsushin Kogyo KK
Application granted granted Critical
Publication of CA1136784A publication Critical patent/CA1136784A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M9/00—Arrangements for interconnection not involving centralised switching
    • H04M9/002—Arrangements for interconnection not involving centralised switching with subscriber controlled access to a line, i.e. key telephone systems
    • H04M9/005—Arrangements for interconnection not involving centralised switching with subscriber controlled access to a line, i.e. key telephone systems with subscriber controlled access to an exchange line
    • H04M9/007—Arrangements for interconnection not involving centralised switching with subscriber controlled access to a line, i.e. key telephone systems with subscriber controlled access to an exchange line wherein the key telephone sets are star-connected to a central unit by a limited number of lines

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Sub-Exchange Stations And Push- Button Telephones (AREA)
CA000326739A 1978-05-02 1979-05-01 Office line connection circuit during service interruptions in key telephone apparatus Expired CA1136784A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP1978059262U JPS54162714U (enExample) 1978-05-02 1978-05-02
JP53-59262 1978-05-02

Publications (1)

Publication Number Publication Date
CA1136784A true CA1136784A (en) 1982-11-30

Family

ID=13108272

Family Applications (1)

Application Number Title Priority Date Filing Date
CA000326739A Expired CA1136784A (en) 1978-05-02 1979-05-01 Office line connection circuit during service interruptions in key telephone apparatus

Country Status (3)

Country Link
US (1) US4260857A (enExample)
JP (1) JPS54162714U (enExample)
CA (1) CA1136784A (enExample)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4607144A (en) * 1984-01-20 1986-08-19 Telecomputer Corporation, Ltd. Apparatus for enhancing the use of electromechanical key telephone systems
US4631367A (en) * 1984-08-29 1986-12-23 Lantel International Corp. Multi-line telephone system

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3660611A (en) * 1970-06-05 1972-05-02 Bell Telephone Labor Inc Program controlled key telephone system for automatic selection of a prime line
US4027110A (en) * 1973-12-05 1977-05-31 Iwasaki Tsushinki Kabushiki Kaisha Key telephone system
US4117274A (en) * 1973-12-26 1978-09-26 Bell Telephone Laboratories, Incorporated Key telephone privacy circuit
GB1492542A (en) * 1974-04-03 1977-11-23 Gte International Inc Telephone intercommunication system incorporating dialling arrangement
US4125749A (en) * 1975-08-09 1978-11-14 Tamura Electric Works, Ltd. Key telephone systems
US4096359A (en) * 1976-10-12 1978-06-20 International Standard Electric Corporation Key telephone system interconnection apparatus

Also Published As

Publication number Publication date
US4260857A (en) 1981-04-07
JPS54162714U (enExample) 1979-11-14

Similar Documents

Publication Publication Date Title
EP0161031B1 (en) Telecommunication system, in particular telephone system
GB1180140A (en) Automatic Signal Transmission System
CA1211239A (en) Terminal interface connecting terminal unit having central office line interface to key telephone system
CA1136784A (en) Office line connection circuit during service interruptions in key telephone apparatus
US2975237A (en) Telephone conference circuit
CA1044389A (en) Key telephone privacy circuit
US2340160A (en) Private branch exchange telephone system employing phonographs
US4453049A (en) Arrangement for single line testing
US4086446A (en) Emergency announcement system
GB1326955A (en) Telephone systems
US2862062A (en) Holding arrangement for universaltype line circuit
JPS5654158A (en) Control system for call waiting
US2943155A (en) Preferred subscriber telephone system
US2200820A (en) Automatic telephone system
CA1080867A (en) Right-of-way control circuit for key telephone intercommunication system
JPS5795744A (en) Automatic line switching device for data communication device
US1615305A (en) Telephone system
US1741639A (en) Secretary service for telephones
JPS5673997A (en) Extension transmission restricting system
GB1467166A (en) Line switching system
GB1433969A (en) Frequency multiplex switching system
US3967075A (en) Attendant board system in a telephone exchange
US3621146A (en) Key telephone station having multinetwork access
US3427405A (en) Seizure and hold circuits for a communication switching network
JPS6317279B2 (enExample)

Legal Events

Date Code Title Description
MKEX Expiry