GB937086A - Improvements in or relating to circuit arrangements for use in automatic telephone systems - Google Patents

Improvements in or relating to circuit arrangements for use in automatic telephone systems

Info

Publication number
GB937086A
GB937086A GB843362A GB843362A GB937086A GB 937086 A GB937086 A GB 937086A GB 843362 A GB843362 A GB 843362A GB 843362 A GB843362 A GB 843362A GB 937086 A GB937086 A GB 937086A
Authority
GB
United Kingdom
Prior art keywords
relays
relay
line
busy tone
march
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
GB843362A
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.)
Philips Electrical Industries Ltd
Original Assignee
Philips Electrical Industries 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
Application filed by Philips Electrical Industries Ltd filed Critical Philips Electrical Industries Ltd
Publication of GB937086A publication Critical patent/GB937086A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Interface Circuits In Exchanges (AREA)
  • Sub-Exchange Stations And Push- Button Telephones (AREA)

Abstract

937,086. Automatic exchange systems. PHILIPS ELECTRICAL INDUSTRIES Ltd. March 5, 1962 [March 8, 1961], No. 8433/62. Class 40 (4). In a system in which subscribers' lines are connected to a link circuit by the operation of a pair of relays, these relays are arranged to release in succession in order, when required, to connect up a source of busy tone. In the case of link circuit 4, a calling line is connected to feed relay X by relays 1A, 1B or 2A, 2B, while a called line is connected to feed relay Y by relays 1C, 1D or 2C, 2D, these operations being controlled by the marking of wires 6, 7 in a manner not shown. The connecting relays are of the kind that remain in their operated positions until restored by current through their releasing windings shown at the foot of the Figure. Assuming an established connection, when one subscriber hangs up relays E, F (which are dependent on X, Y) fall back in turn and thus one connecting relay of each operative pair releases before the other. Relay G now energizes over the remaining subscriber's loop and connects busy tone thereto from a source 12. In the setting up of a connection, relays E, F energize initially over wire 13, and if the called line is found busy this wire is opened, with the result that busy tone is applied in a similar way to the calling line. Relay G has opposing windings to avoid its operation in series with line relay L.
GB843362A 1961-03-08 1962-03-05 Improvements in or relating to circuit arrangements for use in automatic telephone systems Expired GB937086A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL262148 1961-03-08

Publications (1)

Publication Number Publication Date
GB937086A true GB937086A (en) 1963-09-18

Family

ID=19752918

Family Applications (1)

Application Number Title Priority Date Filing Date
GB843362A Expired GB937086A (en) 1961-03-08 1962-03-05 Improvements in or relating to circuit arrangements for use in automatic telephone systems

Country Status (5)

Country Link
CH (1) CH391007A (en)
DE (1) DE1178472B (en)
GB (1) GB937086A (en)
NL (1) NL262148A (en)
SE (1) SE310375B (en)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE763193C (en) *
NL82979C (en) * 1950-10-06

Also Published As

Publication number Publication date
DE1178472B (en) 1964-09-24
NL262148A (en)
CH391007A (en) 1965-04-30
SE310375B (en) 1969-04-28

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