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JPS57135592A - Subscriber circuit - Google Patents

Subscriber circuit

Info

Publication number
JPS57135592A
JPS57135592A JP2109581A JP2109581A JPS57135592A JP S57135592 A JPS57135592 A JP S57135592A JP 2109581 A JP2109581 A JP 2109581A JP 2109581 A JP2109581 A JP 2109581A JP S57135592 A JPS57135592 A JP S57135592A
Authority
JP
Japan
Prior art keywords
control
circuit
microprocessor
subscriber
control program
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
JP2109581A
Other languages
Japanese (ja)
Inventor
Osamu Enomoto
Shuichi Sagawa
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 Corp
Original Assignee
NEC Corp
Nippon Electric Co 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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP2109581A priority Critical patent/JPS57135592A/en
Publication of JPS57135592A publication Critical patent/JPS57135592A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Devices For Supply Of Signal Current (AREA)
  • Interface Circuits In Exchanges (AREA)

Abstract

PURPOSE:To realize the flexibility to the specification change and the reduction in remarkable mounting space, by replacing the control section for subscriber circuit between microprocessor and control program. CONSTITUTION:A general-purpose microprocessor 12, control program storage element 13, callout signal input terminal RING and subscriber 1 are connected. Terminals A1, B1, call current circuit 2, photocoupler PC, relay L transformer T, cross point control circuit 10, voltage comparator 11, gates 14, 15 and interface terminals to control the subscriber circuit externally, are provided. In the circuit, DC loop detection, callout signal transmission, ground button detection and polarity inversion function are made with the control of a microprocessor 12 and control program element 13. Thus, the reduction in remarkable mounting space and the flexibility to specification change can be realized.
JP2109581A 1981-02-16 1981-02-16 Subscriber circuit Pending JPS57135592A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2109581A JPS57135592A (en) 1981-02-16 1981-02-16 Subscriber circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2109581A JPS57135592A (en) 1981-02-16 1981-02-16 Subscriber circuit

Publications (1)

Publication Number Publication Date
JPS57135592A true JPS57135592A (en) 1982-08-21

Family

ID=12045308

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2109581A Pending JPS57135592A (en) 1981-02-16 1981-02-16 Subscriber circuit

Country Status (1)

Country Link
JP (1) JPS57135592A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59161158A (en) * 1983-03-04 1984-09-11 Oki Electric Ind Co Ltd Subscriber terminal signal detecting system
JPS60157369A (en) * 1984-01-26 1985-08-17 Iwatsu Electric Co Ltd Speech current supply circuit

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59161158A (en) * 1983-03-04 1984-09-11 Oki Electric Ind Co Ltd Subscriber terminal signal detecting system
JPS60157369A (en) * 1984-01-26 1985-08-17 Iwatsu Electric Co Ltd Speech current supply circuit
JPH0351349B2 (en) * 1984-01-26 1991-08-06 Iwatsu Electric Co Ltd

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