IT1033426B - Rivelatore di chiamate di richiesta in centrali telefoniche - Google Patents

Rivelatore di chiamate di richiesta in centrali telefoniche

Info

Publication number
IT1033426B
IT1033426B IT2093075A IT2093075A IT1033426B IT 1033426 B IT1033426 B IT 1033426B IT 2093075 A IT2093075 A IT 2093075A IT 2093075 A IT2093075 A IT 2093075A IT 1033426 B IT1033426 B IT 1033426B
Authority
IT
Italy
Prior art keywords
control units
telephone control
request call
call detector
detector
Prior art date
Application number
IT2093075A
Other languages
English (en)
Italian (it)
Inventor
Ala Eddin Omar
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
Application granted granted Critical
Publication of IT1033426B publication Critical patent/IT1033426B/it

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/42—Systems providing special services or facilities to subscribers
    • H04M3/58—Arrangements for transferring received calls from one subscriber to another; Arrangements affording interim conversations between either the calling or the called party and a third party

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Interface Circuits In Exchanges (AREA)
IT2093075A 1974-03-06 1975-03-05 Rivelatore di chiamate di richiesta in centrali telefoniche IT1033426B (it)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE7402969A SE7402969L (cs) 1974-03-06 1974-03-06

Publications (1)

Publication Number Publication Date
IT1033426B true IT1033426B (it) 1979-07-10

Family

ID=20320429

Family Applications (1)

Application Number Title Priority Date Filing Date
IT2093075A IT1033426B (it) 1974-03-06 1975-03-05 Rivelatore di chiamate di richiesta in centrali telefoniche

Country Status (4)

Country Link
DE (1) DE2508547A1 (cs)
GB (1) GB1494136A (cs)
IT (1) IT1033426B (cs)
SE (1) SE7402969L (cs)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7904429A (nl) * 1979-06-06 1980-12-09 Philips Nv Stroomdetectie-inrichting voor een automatische telefooncentrale.
DE3108264C2 (de) * 1981-03-05 1984-05-30 Deutsche Fernsprecher Gesellschaft Mbh Marburg, 3550 Marburg Schaltungsanordnung zur Erkennung des Schaltzustandes einer Erdtaste eines Fernsprechapparates

Also Published As

Publication number Publication date
GB1494136A (en) 1977-12-07
DE2508547A1 (de) 1975-09-11
SE7402969L (cs) 1975-09-08

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