GB231138A - Improvements in telephone exchange systems - Google Patents

Improvements in telephone exchange systems

Info

Publication number
GB231138A
GB231138A GB3450/25A GB345025A GB231138A GB 231138 A GB231138 A GB 231138A GB 3450/25 A GB3450/25 A GB 3450/25A GB 345025 A GB345025 A GB 345025A GB 231138 A GB231138 A GB 231138A
Authority
GB
United Kingdom
Prior art keywords
parallel circuits
conversation
exchange systems
contacts
group
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
GB3450/25A
Other languages
English (en)
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.)
Telefonaktiebolaget LM Ericsson AB
Original Assignee
Telefonaktiebolaget LM Ericsson AB
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 Telefonaktiebolaget LM Ericsson AB filed Critical Telefonaktiebolaget LM Ericsson AB
Publication of GB231138A publication Critical patent/GB231138A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M15/00—Arrangements for metering, time-control or time indication ; Metering, charging or billing arrangements for voice wireline or wireless communications, e.g. VoIP
    • H04M15/10—Metering calls from calling party, i.e. A-party charged for the communication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/08—Indicating faults in circuits or apparatus
    • H04M3/12—Marking faulty circuits "busy"; Enabling equipment to disengage itself from faulty circuits ; Using redundant circuits; Response of a circuit, apparatus or system to an error

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Meter Arrangements (AREA)
GB3450/25A 1924-03-21 1925-02-06 Improvements in telephone exchange systems Expired GB231138A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE231138X 1924-03-21

Publications (1)

Publication Number Publication Date
GB231138A true GB231138A (en) 1925-08-06

Family

ID=20305696

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3450/25A Expired GB231138A (en) 1924-03-21 1925-02-06 Improvements in telephone exchange systems

Country Status (3)

Country Link
FR (1) FR593120A (enrdf_load_stackoverflow)
GB (1) GB231138A (enrdf_load_stackoverflow)
NL (1) NL18580C (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1011473B (de) * 1955-03-01 1957-07-04 Siemens Spa Italiana Schaltungsanordnung fuer Verkehrsmessungen an Gruppen von Schalteinrichtungen in Fernmelde-, insbesondere Fernsprechanlagen
DE1011474B (de) * 1955-02-21 1957-07-04 Siemens Spa Italiana Schaltungsanordnung fuer Fernmelde-, insbesondere Fernsprechanlagen zur Verkehrsbeobachtung an einer Gruppe von Schalteinrichtungen

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1011474B (de) * 1955-02-21 1957-07-04 Siemens Spa Italiana Schaltungsanordnung fuer Fernmelde-, insbesondere Fernsprechanlagen zur Verkehrsbeobachtung an einer Gruppe von Schalteinrichtungen
DE1011473B (de) * 1955-03-01 1957-07-04 Siemens Spa Italiana Schaltungsanordnung fuer Verkehrsmessungen an Gruppen von Schalteinrichtungen in Fernmelde-, insbesondere Fernsprechanlagen

Also Published As

Publication number Publication date
NL18580C (enrdf_load_stackoverflow)
FR593120A (fr) 1925-08-17

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