NO132411B - - Google Patents

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Publication number
NO132411B
NO132411B NO740746A NO740746A NO132411B NO 132411 B NO132411 B NO 132411B NO 740746 A NO740746 A NO 740746A NO 740746 A NO740746 A NO 740746A NO 132411 B NO132411 B NO 132411B
Authority
NO
Norway
Prior art keywords
transistor
line
current
telephone
tone
Prior art date
Application number
NO740746A
Other languages
English (en)
Norwegian (no)
Other versions
NO132411C (xx
Inventor
K A Persson
Original Assignee
Ericsson Telefon Ab L M
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 Ericsson Telefon Ab L M filed Critical Ericsson Telefon Ab L M
Publication of NO132411B publication Critical patent/NO132411B/no
Publication of NO132411C publication Critical patent/NO132411C/no

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/26—Devices for calling a subscriber
    • H04M1/30—Devices which can set up and transmit only one digit at a time
    • H04M1/50—Devices which can set up and transmit only one digit at a time by generating or selecting currents of predetermined frequencies or combinations of frequencies
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M19/00—Current supply arrangements for telephone systems
    • H04M19/08—Current supply arrangements for telephone systems with current supply sources at the substations

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Devices For Supply Of Signal Current (AREA)
  • Interface Circuits In Exchanges (AREA)
NO740746A 1973-03-05 1974-03-04 NO132411C (xx)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE7303043A SE363948B (xx) 1973-03-05 1973-03-05

Publications (2)

Publication Number Publication Date
NO132411B true NO132411B (xx) 1975-07-28
NO132411C NO132411C (xx) 1975-11-05

Family

ID=20316803

Family Applications (1)

Application Number Title Priority Date Filing Date
NO740746A NO132411C (xx) 1973-03-05 1974-03-04

Country Status (11)

Country Link
US (1) US3916114A (xx)
CA (1) CA993581A (xx)
CH (1) CH581931A5 (xx)
DK (1) DK138146B (xx)
FI (1) FI56293C (xx)
FR (1) FR2220941B1 (xx)
GB (1) GB1447726A (xx)
IT (1) IT1007412B (xx)
NL (1) NL7402380A (xx)
NO (1) NO132411C (xx)
SE (1) SE363948B (xx)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4323792A (en) * 1978-06-28 1982-04-06 Bergmann Guenther Two terminal circuitry for voltage limitation
JPS601790B2 (ja) * 1979-09-14 1985-01-17 岩崎通信機株式会社 押し釦ダイヤル回路
US4286120A (en) * 1979-10-15 1981-08-25 Gte Automatic Electric Labs Inc. Current regulated pulse dialer circuit
US4536614A (en) * 1982-12-13 1985-08-20 Gte Communication Systems Corporation Supervision and dial pulse detection circuit for a telephone subscriber line

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3035122A (en) * 1958-09-30 1962-05-15 Gen Dynamics Corp Constant current line circuitt for loop telephone lines
FR2087469A5 (xx) * 1970-05-20 1971-12-31 Ericsson Telefon Ab L M
CA930488A (en) * 1971-08-27 1973-07-17 C. J. Cowpland Michael Power supply

Also Published As

Publication number Publication date
IT1007412B (it) 1976-10-30
FI56293C (fi) 1979-12-10
FR2220941A1 (xx) 1974-10-04
AU6618074A (en) 1975-09-04
NL7402380A (xx) 1974-09-09
SE363948B (xx) 1974-02-04
US3916114A (en) 1975-10-28
CA993581A (en) 1976-07-20
DE2408688A1 (de) 1974-09-26
NO132411C (xx) 1975-11-05
GB1447726A (en) 1976-08-25
FI56293B (fi) 1979-08-31
CH581931A5 (xx) 1976-11-15
FR2220941B1 (xx) 1977-09-23
DK138146B (da) 1978-07-17
DK138146C (xx) 1978-12-18
DE2408688B2 (de) 1976-09-23

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