GB1394948A - Method for indicating a free-line state - Google Patents

Method for indicating a free-line state

Info

Publication number
GB1394948A
GB1394948A GB1209073A GB1209073A GB1394948A GB 1394948 A GB1394948 A GB 1394948A GB 1209073 A GB1209073 A GB 1209073A GB 1209073 A GB1209073 A GB 1209073A GB 1394948 A GB1394948 A GB 1394948A
Authority
GB
United Kingdom
Prior art keywords
indicating
free
line state
march
speed
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
GB1209073A
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.)
Nederlanden Staat
Original Assignee
Nederlanden Staat
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 Nederlanden Staat filed Critical Nederlanden Staat
Publication of GB1394948A publication Critical patent/GB1394948A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/50—Circuit switching systems, i.e. systems in which the path is physically permanent during the communication
    • H04L12/52—Circuit switching systems, i.e. systems in which the path is physically permanent during the communication using time division techniques
    • H04L12/525—Circuit switching systems, i.e. systems in which the path is physically permanent during the communication using time division techniques involving a stored program control

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Maintenance And Management Of Digital Transmission (AREA)
  • Time-Division Multiplex Systems (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

1394948 Digital data transmission DE STAAT DER NEDERLANDEN TE DEZEN VERTEGENWOORDIGD DOOR DE DIRECTEUR-GENERAAL DER POSTERIJEN TELEGRAFIE EN TELEFONIE 13 March 1973 [17 March 1972] 12090/73 Heading H4P A method of indicating a free-line state of a subscriber's line consists of sending a repetitive pattern, e.g. alternate "1" and "0" bits, after clear-back. The receiver includes means to determine the speed of change in signal polarity during a disengaged connection so that the subscribers signalling speed may be determined.
GB1209073A 1972-03-17 1973-03-13 Method for indicating a free-line state Expired GB1394948A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL7203611A NL147302B (en) 1972-03-17 1972-03-17 SYSTEM FOR SYNCHRONOUS DATA TRANSMISSION BETWEEN A SUBSCRIBER AND A TERMINAL CENTER.

Publications (1)

Publication Number Publication Date
GB1394948A true GB1394948A (en) 1975-05-21

Family

ID=19815637

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1209073A Expired GB1394948A (en) 1972-03-17 1973-03-13 Method for indicating a free-line state

Country Status (6)

Country Link
BE (1) BE796943A (en)
CH (1) CH552314A (en)
FR (1) FR2176838B1 (en)
GB (1) GB1394948A (en)
NL (1) NL147302B (en)
SE (1) SE7303647L (en)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL90792C (en) * 1952-05-13
BE549048A (en) * 1955-06-28
FR1493361A (en) * 1965-09-22 1967-08-25 Nederlanden Staat Information transmission system
FR2177242A5 (en) * 1972-03-21 1973-11-02 Holweg Const Mec

Also Published As

Publication number Publication date
BE796943A (en) 1973-07-16
NL147302B (en) 1975-09-15
SE7303647L (en) 1973-09-18
DE2312809A1 (en) 1973-09-27
CH552314A (en) 1974-07-31
FR2176838B1 (en) 1977-04-29
NL7203611A (en) 1973-09-19
DE2312809B2 (en) 1976-09-23
FR2176838A1 (en) 1973-11-02

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Legal Events

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