GB1177958A - Improvements in or relating to Telephone Signalling - Google Patents

Improvements in or relating to Telephone Signalling

Info

Publication number
GB1177958A
GB1177958A GB60167A GB60167A GB1177958A GB 1177958 A GB1177958 A GB 1177958A GB 60167 A GB60167 A GB 60167A GB 60167 A GB60167 A GB 60167A GB 1177958 A GB1177958 A GB 1177958A
Authority
GB
United Kingdom
Prior art keywords
relating
transistor
signalling
telephone
telephone signalling
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
GB60167A
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
Priority to GB60167A priority Critical patent/GB1177958A/en
Publication of GB1177958A publication Critical patent/GB1177958A/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
    • H04Q1/30—Signalling arrangements; Manipulation of signalling currents
    • H04Q1/32—Signalling arrangements; Manipulation of signalling currents using trains of dc pulses
    • H04Q1/36—Pulse-correcting arrangements, e.g. for reducing effects due to interference

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Interface Circuits In Exchanges (AREA)

Abstract

1,177,958. Automatic exchangers. TELEFONAKTIEBOLAGET L. M. ERICSSON. 4 Jan., 1967, No. 601/67. Heading H4K. In a telephone impulse repeating circuit a transistor, in series with an impulse repeating relay, provides a threshold to received pulses to reduce pulse distortion; the bias of the transistor, and hence the threshold level presented, is controlled in dependence upon line current. Arrangements of signalling using D.C. and A.C. to impulses on one or both legs are described.
GB60167A 1967-01-04 1967-01-04 Improvements in or relating to Telephone Signalling Expired GB1177958A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB60167A GB1177958A (en) 1967-01-04 1967-01-04 Improvements in or relating to Telephone Signalling

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB60167A GB1177958A (en) 1967-01-04 1967-01-04 Improvements in or relating to Telephone Signalling

Publications (1)

Publication Number Publication Date
GB1177958A true GB1177958A (en) 1970-01-14

Family

ID=9707253

Family Applications (1)

Application Number Title Priority Date Filing Date
GB60167A Expired GB1177958A (en) 1967-01-04 1967-01-04 Improvements in or relating to Telephone Signalling

Country Status (1)

Country Link
GB (1) GB1177958A (en)

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