GB2212029A - An ancillary device for a telephone connected to a telephone line - Google Patents

An ancillary device for a telephone connected to a telephone line Download PDF

Info

Publication number
GB2212029A
GB2212029A GB8800631A GB8800631A GB2212029A GB 2212029 A GB2212029 A GB 2212029A GB 8800631 A GB8800631 A GB 8800631A GB 8800631 A GB8800631 A GB 8800631A GB 2212029 A GB2212029 A GB 2212029A
Authority
GB
United Kingdom
Prior art keywords
voltage
resistor
load
telephone
ancillary device
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.)
Withdrawn
Application number
GB8800631A
Other languages
English (en)
Other versions
GB8800631D0 (en
Inventor
Martin Kostner
Jorn Julius Noe Bennedbaek
Soren Abildgaard Nielsen
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.)
DANCOR APS
Original Assignee
DANCOR APS
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 DANCOR APS filed Critical DANCOR APS
Publication of GB8800631D0 publication Critical patent/GB8800631D0/en
Publication of GB2212029A publication Critical patent/GB2212029A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/60—Substation equipment, e.g. for use by subscribers including speech amplifiers
    • H04M1/6033—Substation equipment, e.g. for use by subscribers including speech amplifiers for providing handsfree use or a loudspeaker mode in telephone sets
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/66—Substation equipment, e.g. for use by subscribers with means for preventing unauthorised or fraudulent calling
    • H04M1/663—Preventing unauthorised calls to a telephone set
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M19/00—Current supply arrangements for telephone systems
    • H04M19/02—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone
    • H04M19/04—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone the ringing-current being generated at the substations
    • 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)
  • Computer Security & Cryptography (AREA)
  • Devices For Supply Of Signal Current (AREA)
  • Selective Calling Equipment (AREA)
  • Interconnected Communication Systems, Intercoms, And Interphones (AREA)
  • Telephone Function (AREA)
  • Communication Cables (AREA)
GB8800631A 1987-10-30 1988-01-12 An ancillary device for a telephone connected to a telephone line Withdrawn GB2212029A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3736797 1987-10-30
DE19873740026 DE3740026A1 (de) 1987-10-30 1987-11-26 Zusatzeinrichtung zu einem an einer telefonleitung angeschlossenen telefon

Publications (2)

Publication Number Publication Date
GB8800631D0 GB8800631D0 (en) 1988-02-10
GB2212029A true GB2212029A (en) 1989-07-12

Family

ID=25861284

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8800631A Withdrawn GB2212029A (en) 1987-10-30 1988-01-12 An ancillary device for a telephone connected to a telephone line

Country Status (5)

Country Link
DE (1) DE3740026A1 (sv)
DK (1) DK158288A (sv)
GB (1) GB2212029A (sv)
NO (1) NO880103L (sv)
SE (1) SE8801048L (sv)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4140153C2 (de) * 1991-12-05 2003-04-03 Tenovis Gmbh & Co Kg Schaltungsanordnung für einen Fernsprechapparat mit einer Tonrufschaltung

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3673339A (en) * 1970-07-22 1972-06-27 Bell Telephone Labor Inc Artificial line busy circuit
GB1425894A (en) * 1972-03-21 1976-02-18 Socotel Telephone line testing devices

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3673339A (en) * 1970-07-22 1972-06-27 Bell Telephone Labor Inc Artificial line busy circuit
GB1425894A (en) * 1972-03-21 1976-02-18 Socotel Telephone line testing devices

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4140153C2 (de) * 1991-12-05 2003-04-03 Tenovis Gmbh & Co Kg Schaltungsanordnung für einen Fernsprechapparat mit einer Tonrufschaltung

Also Published As

Publication number Publication date
DK158288A (da) 1989-05-01
DE3740026A1 (de) 1989-05-11
GB8800631D0 (en) 1988-02-10
SE8801048D0 (sv) 1988-03-22
DK158288D0 (da) 1988-03-23
SE8801048L (sv) 1989-05-01
NO880103L (no) 1989-05-02
NO880103D0 (no) 1988-01-12

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)