GB2093313B - Key telephone system - Google Patents

Key telephone system

Info

Publication number
GB2093313B
GB2093313B GB8201710A GB8201710A GB2093313B GB 2093313 B GB2093313 B GB 2093313B GB 8201710 A GB8201710 A GB 8201710A GB 8201710 A GB8201710 A GB 8201710A GB 2093313 B GB2093313 B GB 2093313B
Authority
GB
United Kingdom
Prior art keywords
telephone system
key telephone
key
telephone
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
GB8201710A
Other versions
GB2093313A (en
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
Nippon Tsushin Kogyo KK
Original Assignee
Nippon Telegraph and Telephone Corp
Nippon Tsushin Kogyo KK
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, Nippon Tsushin Kogyo KK, Nitsuko Corp filed Critical Nippon Telegraph and Telephone Corp
Publication of GB2093313A publication Critical patent/GB2093313A/en
Application granted granted Critical
Publication of GB2093313B publication Critical patent/GB2093313B/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
    • 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)
GB8201710A 1981-02-04 1982-01-21 Key telephone system Expired GB2093313B (en)

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
GB2093313A GB2093313A (en) 1982-08-25
GB2093313B true GB2093313B (en) 1984-10-24

Family

ID=11880658

Family Applications (1)

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

Country Status (2)

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

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58195393A (en) * 1982-05-10 1983-11-14 Nec Corp Key telephone set
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 (en) 2001-03-23 2005-08-03 株式会社デンソー Heat exchanger

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51108504A (en) * 1975-03-19 1976-09-25 Tokyo Shibaura Electric Co KAKUSEIDENWASOCHI
JPS5915174Y2 (en) * 1978-05-19 1984-05-04 日本通信工業株式会社 Audio frequency signal, power and digital pulse transmission circuits in main equipment and terminal equipment

Also Published As

Publication number Publication date
GB2093313A (en) 1982-08-25
JPH0223079B2 (en) 1990-05-22
JPS57129565A (en) 1982-08-11

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Legal Events

Date Code Title Description
PE20 Patent expired after termination of 20 years

Effective date: 20020120