JPS5420603A - Block system of exchange against subscriber's circuit - Google Patents

Block system of exchange against subscriber's circuit

Info

Publication number
JPS5420603A
JPS5420603A JP8502377A JP8502377A JPS5420603A JP S5420603 A JPS5420603 A JP S5420603A JP 8502377 A JP8502377 A JP 8502377A JP 8502377 A JP8502377 A JP 8502377A JP S5420603 A JPS5420603 A JP S5420603A
Authority
JP
Japan
Prior art keywords
circuit
block system
exchange against
against subscriber
block
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.)
Pending
Application number
JP8502377A
Other languages
Japanese (ja)
Inventor
Masaru Takamiko
Toshio Ishida
Akio Ohara
Masatoshi Wada
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.)
Hitachi Ltd
Nippon Telegraph and Telephone Corp
Original Assignee
Hitachi Ltd
Nippon Telegraph and Telephone 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 Hitachi Ltd, Nippon Telegraph and Telephone Corp filed Critical Hitachi Ltd
Priority to JP8502377A priority Critical patent/JPS5420603A/en
Publication of JPS5420603A publication Critical patent/JPS5420603A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M11/00—Telephonic communication systems specially adapted for combination with other electrical systems
    • H04M11/06—Simultaneous speech and data transmission, e.g. telegraphic transmission over the same conductors

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Monitoring And Testing Of Exchanges (AREA)

Abstract

PURPOSE:To enable a two-wire terminal equipment of a free-line subscriber's terminal to form a block without using a large private branch exchange control circuit, by giving the terminal apparatus side a function of sending out a block tone.
JP8502377A 1977-07-18 1977-07-18 Block system of exchange against subscriber's circuit Pending JPS5420603A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8502377A JPS5420603A (en) 1977-07-18 1977-07-18 Block system of exchange against subscriber's circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8502377A JPS5420603A (en) 1977-07-18 1977-07-18 Block system of exchange against subscriber's circuit

Publications (1)

Publication Number Publication Date
JPS5420603A true JPS5420603A (en) 1979-02-16

Family

ID=13847120

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8502377A Pending JPS5420603A (en) 1977-07-18 1977-07-18 Block system of exchange against subscriber's circuit

Country Status (1)

Country Link
JP (1) JPS5420603A (en)

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