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JPS57129565A - Key telephone system - Google Patents

Key telephone system

Info

Publication number
JPS57129565A
JPS57129565A JP1514681A JP1514681A JPS57129565A JP S57129565 A JPS57129565 A JP S57129565A JP 1514681 A JP1514681 A JP 1514681A JP 1514681 A JP1514681 A JP 1514681A JP S57129565 A JPS57129565 A JP S57129565A
Authority
JP
Japan
Prior art keywords
telephone
cables
handset
key telephone
speaker
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
JP1514681A
Other languages
English (en)
Other versions
JPH0223079B2 (ja
Inventor
Michio Mito
Akira Shinoi
Masaki Ogawa
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 Platforms Ltd
Nippon Telegraph and Telephone Corp
Original Assignee
Nippon Telegraph and Telephone Corp
Nitsuko Corp
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, Nitsuko Corp filed Critical Nippon Telegraph and Telephone Corp
Priority to JP1514681A priority Critical patent/JPS57129565A/ja
Priority to GB8201710A priority patent/GB2093313B/en
Publication of JPS57129565A publication Critical patent/JPS57129565A/ja
Publication of JPH0223079B2 publication Critical patent/JPH0223079B2/ja
Granted 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H04Q3/0008—Selecting arrangements using relay selectors in the switching stages
    • H04Q3/0012—Selecting arrangements using relay selectors in the switching stages in which the relays are arranged in a matrix configuration

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Sub-Exchange Stations And Push- Button Telephones (AREA)
JP1514681A 1981-02-04 1981-02-04 Key telephone system Granted JPS57129565A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP1514681A JPS57129565A (en) 1981-02-04 1981-02-04 Key telephone system
GB8201710A GB2093313B (en) 1981-02-04 1982-01-21 Key telephone system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1514681A JPS57129565A (en) 1981-02-04 1981-02-04 Key telephone system

Publications (2)

Publication Number Publication Date
JPS57129565A true JPS57129565A (en) 1982-08-11
JPH0223079B2 JPH0223079B2 (ja) 1990-05-22

Family

ID=11880658

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1514681A Granted JPS57129565A (en) 1981-02-04 1981-02-04 Key telephone system

Country Status (2)

Country Link
JP (1) JPS57129565A (ja)
GB (1) GB2093313B (ja)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58195393A (ja) * 1982-05-10 1983-11-14 Nec Corp ボタン電話装置
GB2157130B (en) * 1984-03-30 1987-12-09 Lake Electronic Tech Telephone apparatus
GB2320850B (en) * 1996-11-29 1999-03-10 Samsung Electronics Co Ltd Automatic call designation in key telephone exchange
JP3678159B2 (ja) 2001-03-23 2005-08-03 株式会社デンソー 熱交換器

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51108504A (ja) * 1975-03-19 1976-09-25 Tokyo Shibaura Electric Co Kakuseidenwasochi
JPS54169411U (ja) * 1978-05-19 1979-11-30

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51108504A (ja) * 1975-03-19 1976-09-25 Tokyo Shibaura Electric Co Kakuseidenwasochi
JPS54169411U (ja) * 1978-05-19 1979-11-30

Also Published As

Publication number Publication date
GB2093313B (en) 1984-10-24
GB2093313A (en) 1982-08-25
JPH0223079B2 (ja) 1990-05-22

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