NO127597B - - Google Patents

Download PDF

Info

Publication number
NO127597B
NO127597B NO03507/70A NO350770A NO127597B NO 127597 B NO127597 B NO 127597B NO 03507/70 A NO03507/70 A NO 03507/70A NO 350770 A NO350770 A NO 350770A NO 127597 B NO127597 B NO 127597B
Authority
NO
Norway
Prior art keywords
oscillator
transistor
line
current
base
Prior art date
Application number
NO03507/70A
Other languages
English (en)
Norwegian (no)
Inventor
N Madsen
Original Assignee
Gnt Automatic As
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 Gnt Automatic As filed Critical Gnt Automatic As
Publication of NO127597B publication Critical patent/NO127597B/no

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q1/00—Details of selecting apparatus or arrangements
    • H04Q1/18—Electrical details
    • H04Q1/30—Signalling arrangements; Manipulation of signalling currents
    • H04Q1/32—Signalling arrangements; Manipulation of signalling currents using trains of DC pulses

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Interface Circuits In Exchanges (AREA)
NO03507/70A 1969-09-19 1970-09-15 NO127597B (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DK499869 1969-09-19

Publications (1)

Publication Number Publication Date
NO127597B true NO127597B (de) 1973-07-16

Family

ID=8138533

Family Applications (1)

Application Number Title Priority Date Filing Date
NO03507/70A NO127597B (de) 1969-09-19 1970-09-15

Country Status (8)

Country Link
AU (1) AU2009270A (de)
BE (1) BE756354A (de)
CH (1) CH518663A (de)
DE (1) DE2046226A1 (de)
ES (1) ES383759A1 (de)
GB (1) GB1253508A (de)
NO (1) NO127597B (de)
ZA (1) ZA706396B (de)

Also Published As

Publication number Publication date
ES383759A1 (es) 1974-06-01
ZA706396B (en) 1971-05-27
GB1253508A (en) 1971-11-17
BE756354A (fr) 1971-03-18
AU2009270A (en) 1972-03-23
CH518663A (de) 1972-01-31
DE2046226A1 (de) 1971-03-25

Similar Documents

Publication Publication Date Title
EP0209973B1 (de) Schutzanordnung für eine Interface-Schaltung eines Fernsprechanschlusskabels
US4528608A (en) Electronic current interrupter included in a DC distribution system
EP0291169A1 (de) Schutzanordnung für eine Fernsprech-Teilnehmerschnittstellen-Schaltung
DK163549B (da) Spaendingsstyret transientbeskyttelse
KR940011757B1 (ko) 전화 라인 스위치
US4524245A (en) Ring trip detection system
NO127597B (de)
US4507568A (en) Device for initiating the remote feed of electrical users
EP0009293A1 (de) Schaltung zur Verbindung von jeweils nur einem von mehreren Fernsprechapparaten an eine Fernsprechleitung
US4329546A (en) Interface unit for pushbutton selector
US4794640A (en) Switching control apparatus for intercom-telephone sets
JPS6253981B2 (de)
US3848094A (en) Telephone battery feed circuit
US4445003A (en) Improved connection arrangement for connecting series and shunt utilization circuit to a communications channel
US4152549A (en) Suppressor of spurious ringing currents for telephone apparatus
US4099031A (en) Method and apparatus for automatically identifying an individual calling party on a multiparty telephone line
US4443665A (en) Privacy and hold circuit for telephone
US2495791A (en) System for the protection of transmission lines using alternating currents
US3748401A (en) Ring trip circuit
EP0105336B1 (de) Impulswahlschaltung
CA1124906A (en) Discriminating means for telephone circuits
US4223186A (en) Circuit arrangement for line-supplied subscriber stations having dial devices
US5418834A (en) Maintenance termination units
US1037447A (en) Electrical apparatus.
SU71483A1 (ru) Устройство дл автоматического отсчета случаев зан тости