GB1526915A - Pbx systems - Google Patents

Pbx systems

Info

Publication number
GB1526915A
GB1526915A GB3217577A GB3217577A GB1526915A GB 1526915 A GB1526915 A GB 1526915A GB 3217577 A GB3217577 A GB 3217577A GB 3217577 A GB3217577 A GB 3217577A GB 1526915 A GB1526915 A GB 1526915A
Authority
GB
United Kingdom
Prior art keywords
digit
call
exchange
dialled
aue
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.)
Expired
Application number
GB3217577A
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Publication of GB1526915A publication Critical patent/GB1526915A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H04Q3/58—Arrangements providing connection between main exchange and sub-exchange or satellite
    • H04Q3/62—Arrangements providing connection between main exchange and sub-exchange or satellite for connecting to private branch exchanges
    • H04Q3/625—Arrangements in the private branch exchange

Landscapes

  • Physics & Mathematics (AREA)
  • Astronomy & Astrophysics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Exchange Systems With Centralized Control (AREA)
  • Sub-Exchange Stations And Push- Button Telephones (AREA)

Abstract

1526915 Automatic exchange systems; call barring SIEMENS AG 1 Aug 1977 [2 Aug 1976] 32175/77 Heading H4K In a call barring arrangement, e.g. for a PBX, an exchange line set seized for the call prevents the transmission, e.g. to an external exchange of at least the first dialled digit until it has been stored and evaluated for admissibility. In the embodiment, which deals with only the first dialled digit, when an exchange line set AUE is seized for a call from a subscriber T, transmission of dialled digits to a main exchange is prevented by relays U, U, through contact 24; a hunting device WS-S finds a free store WS and converts it to set AUE through a coupler SK-K controlled by relays U, U,. The dialled digit is stored in store SW and evaluated for admissibility by an evaluator BW. If the digit is valid pulses representing said digit are sent to the main exchange via an auxiliary winding LW in the set AUE, if not the call is abandoned. While the stored digit is transmitted a tone is sent to the subscriber to prevent further dialling. Three digits, or the complete number may be similarly validated.
GB3217577A 1976-08-02 1977-08-01 Pbx systems Expired GB1526915A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19762634733 DE2634733A1 (en) 1976-08-02 1976-08-02 CIRCUIT ARRANGEMENT FOR THE EVALUATION OF DIALING INDICATORS FOR OUTGOING CIRCUIT CONNECTIONS IN EXTENSION SYSTEMS

Publications (1)

Publication Number Publication Date
GB1526915A true GB1526915A (en) 1978-10-04

Family

ID=5984542

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3217577A Expired GB1526915A (en) 1976-08-02 1977-08-01 Pbx systems

Country Status (7)

Country Link
AT (1) AT370932B (en)
BE (1) BE857400A (en)
DE (1) DE2634733A1 (en)
DK (1) DK342077A (en)
FI (1) FI772325A (en)
GB (1) GB1526915A (en)
IT (1) IT1085652B (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2811890C2 (en) * 1978-03-18 1986-11-20 Friedrich Merk-Telefonbau GmbH, 8000 München Circuit arrangement for telephone private branch exchanges with tracking switches to prevent unauthorized connections from being made
DE3409134A1 (en) * 1984-03-09 1985-09-12 Deutsche Telephonwerke Und Kabelindustrie Ag, 1000 Berlin Method and circuit arrangement for trunk circuits for blocking devices

Also Published As

Publication number Publication date
DK342077A (en) 1978-02-03
FI772325A (en) 1978-02-03
BE857400A (en) 1978-02-02
IT1085652B (en) 1985-05-28
DE2634733A1 (en) 1978-02-09
ATA541877A (en) 1982-09-15
AT370932B (en) 1983-05-10

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee