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GB600822A - Automatic and semi-automatic telephone exchange systems - Google Patents

Automatic and semi-automatic telephone exchange systems

Info

Publication number
GB600822A
GB600822A GB24602/44A GB2460244A GB600822A GB 600822 A GB600822 A GB 600822A GB 24602/44 A GB24602/44 A GB 24602/44A GB 2460244 A GB2460244 A GB 2460244A GB 600822 A GB600822 A GB 600822A
Authority
GB
United Kingdom
Prior art keywords
potential
relay
automatic
wire
class
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
GB24602/44A
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.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
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 Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Publication of GB600822A publication Critical patent/GB600822A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q1/00—Details of selecting apparatus or arrangements
    • H04Q1/18—Electrical details
    • 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
    • H04Q1/00—Details of selecting apparatus or arrangements
    • H04Q1/18—Electrical details
    • H04Q1/30—Signalling arrangements; Manipulation of signalling currents
    • H04Q1/38—Signalling arrangements; Manipulation of signalling currents using combinations of direct currents of different amplitudes or polarities over line conductors or combination of line conductors

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Devices For Supply Of Signal Current (AREA)

Abstract

600,822. Automatic exchange systems. STANDARD TELEPHONES & CABLES, Ltd. Dec. 8, 1944, No. 24602. Convention date, Feb. 12. [Class 40 (iv)] In an exchange system, subscribers' lines have applied to them a voltage characteristic of the class of service to which they are entitled, the various classes being identified at the exchange by valve arrangements, each responsive to a particular voltage. The distinguishing potential S, which may be between - 26 and - 64 volts rising in twovolt steps, is applied over a high resistance rs to the test wire t under the control of the cut-off relay CORWhen the subscriber initiates a call LR connects - C potential to the line finder which then energizes COR over control wire c, this relay then disconnecting the calling potential and connecting the - S potential. A common lead X is connected through first and second identification finders to a series of pairs of triode valves V1, V2, V3, V4, &c. Both valves of any pair only pass current if the potential on wire t is equal to that applied over resistance rr. The combined anode current of the appropriate pair causes a gas-filled valve GV to fire and operate relay GVR followed by identification relay GSR. Specifications 592,846 and 600,458 are referred to.
GB24602/44A 1944-02-12 1944-12-08 Automatic and semi-automatic telephone exchange systems Expired GB600822A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US600822XA 1944-02-12 1944-02-12

Publications (1)

Publication Number Publication Date
GB600822A true GB600822A (en) 1948-04-20

Family

ID=22027223

Family Applications (1)

Application Number Title Priority Date Filing Date
GB24602/44A Expired GB600822A (en) 1944-02-12 1944-12-08 Automatic and semi-automatic telephone exchange systems

Country Status (3)

Country Link
BE (1) BE464918A (en)
GB (1) GB600822A (en)
NL (1) NL69823C (en)

Also Published As

Publication number Publication date
NL69823C (en)
BE464918A (en)

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