GB541722A - Improvements in or relating to line identification in telephone or like signalling systems - Google Patents

Improvements in or relating to line identification in telephone or like signalling systems

Info

Publication number
GB541722A
GB541722A GB988640A GB988640A GB541722A GB 541722 A GB541722 A GB 541722A GB 988640 A GB988640 A GB 988640A GB 988640 A GB988640 A GB 988640A GB 541722 A GB541722 A GB 541722A
Authority
GB
United Kingdom
Prior art keywords
pbx
operator
lines
exchange
relay
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
GB988640A
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.)
Automatic Telephone and Electric Co Ltd
Original Assignee
Automatic Telephone and Electric Co Ltd
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
Priority to NL61435D priority Critical patent/NL61435C/xx
Priority to BE468236D priority patent/BE468236A/xx
Application filed by Automatic Telephone and Electric Co Ltd filed Critical Automatic Telephone and Electric Co Ltd
Priority to GB988640A priority patent/GB541722A/en
Publication of GB541722A publication Critical patent/GB541722A/en
Priority to FR933090D priority patent/FR933090A/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
    • H04M15/08—Metering calls to called party, i.e. B-party charged for the communication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • 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

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • Astronomy & Astrophysics (AREA)
  • General Physics & Mathematics (AREA)
  • Signal Processing (AREA)
  • Interface Circuits In Exchanges (AREA)
  • Monitoring And Testing Of Exchanges (AREA)

Abstract

541,722. Automatic exchange systems. AUTOMATIC TELEPHONE & ELECTRIC CO., Ltd., and TAYLOR, R. June 6, 1940, No. 9886. [Class 40 (iv)] In an arrangement wherein calling lines are identified at a later stage of the connections of which they form part by the transmission thereover of characteristic impulses, in order to permit a main exchange operator to call back when a PBX subscriber desires a toll or trunk call switching means are provided whereby PBX lines are identified by the number of the first line of the group when the PBX operator is in attendance and by their individual numbers at night or other times when the operator is absent. As shown, the identifying arrangement is of the kind disclosed in Specification 539,823 in which the test wires are connected through pairs of non-linear resistance units NLR to groups of common marking leads. It is assumed that the PBX has seven exchange lines numbered 4831-4837, and it will be seen that according to the condition of relay NS, the test wires are connected all to the units marking lead 1 or to the corresponding leads 1-7. This relay, which is polarized and which retains its armature in the position to which it is set, is controlled by the PBX operator by means of a hand-generator HG which is connected by keys KA, KU to either of two signalling circuits, conveniently the a leg of two lines of the group, which extend to the windings of NS shunted by rectifiers MRA, MRB.
GB988640A 1940-06-06 1940-06-06 Improvements in or relating to line identification in telephone or like signalling systems Expired GB541722A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
NL61435D NL61435C (en) 1940-06-06
BE468236D BE468236A (en) 1940-06-06
GB988640A GB541722A (en) 1940-06-06 1940-06-06 Improvements in or relating to line identification in telephone or like signalling systems
FR933090D FR933090A (en) 1940-06-06 1946-08-29 Improvements to line identification devices in telephone systems or similar signaling systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB988640A GB541722A (en) 1940-06-06 1940-06-06 Improvements in or relating to line identification in telephone or like signalling systems

Publications (1)

Publication Number Publication Date
GB541722A true GB541722A (en) 1941-12-09

Family

ID=9880611

Family Applications (1)

Application Number Title Priority Date Filing Date
GB988640A Expired GB541722A (en) 1940-06-06 1940-06-06 Improvements in or relating to line identification in telephone or like signalling systems

Country Status (4)

Country Link
BE (1) BE468236A (en)
FR (1) FR933090A (en)
GB (1) GB541722A (en)
NL (1) NL61435C (en)

Also Published As

Publication number Publication date
FR933090A (en) 1948-04-09
BE468236A (en)
NL61435C (en)

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