GB1116114A - Electronic cross-point - Google Patents

Electronic cross-point

Info

Publication number
GB1116114A
GB1116114A GB3420266A GB3420266A GB1116114A GB 1116114 A GB1116114 A GB 1116114A GB 3420266 A GB3420266 A GB 3420266A GB 3420266 A GB3420266 A GB 3420266A GB 1116114 A GB1116114 A GB 1116114A
Authority
GB
United Kingdom
Prior art keywords
crosspoint
transformer
current
line
depicts
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
GB3420266A
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.)
International Standard Electric Corp
Original Assignee
International Standard Electric Corp
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 International Standard Electric Corp filed Critical International Standard Electric Corp
Publication of GB1116114A publication Critical patent/GB1116114A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
    • H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
    • H03K17/60—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices the devices being bipolar transistors
    • H03K17/601—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices the devices being bipolar transistors using transformer coupling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H04Q3/42—Circuit arrangements for indirect selecting controlled by common circuits, e.g. register controller, marker
    • H04Q3/52—Circuit arrangements for indirect selecting controlled by common circuits, e.g. register controller, marker using static devices in switching stages, e.g. electronic switching arrangements
    • H04Q3/521—Circuit arrangements for indirect selecting controlled by common circuits, e.g. register controller, marker using static devices in switching stages, e.g. electronic switching arrangements using semiconductors in the switching stages

Abstract

1,116,114. Automatic exchange systems; transistor switching circuits. INTERNATIONAL STANDARD ELECTRIC CORPORATION. 29 July, 1966 [2 Aug., 1965], No. 34202/66. Headings H3T and H4K. A crosspoint switch for a telephone switching network comprises a transistor which is biased " on " by means of a high-frequency current supplied via a transformer. In order to prevent interference from the biasing current, a suitable filter C1, C2 is provided. Selection of a particular crosspoint is effected by opening switch S which normally short-circuits one winding of the transformer. Each crosspoint may have two transformer windings associated therewith such that coincidence of current in both is necessary for crosspoint operation. Fig. 2 (not shown) depicts a " full-wave " circuit comprising two opposite type transistors and two oppositely polarized diodes which are arranged as a parallel combination in series with the line. Fig. 3 (not shown) depicts a rudimentary TDM system in which two lines are connected during opposite peaks of the bias current to a common line. Fig. 4 (not shown) relates to the selective connection of two subscribers to a common line i.e. a form of party line system but none of the usual details concerning the operation of such a system are disclosed.
GB3420266A 1965-08-02 1966-07-29 Electronic cross-point Expired GB1116114A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT709565A AT249762B (en) 1965-08-02 1965-08-02 Circuit arrangement for a high-frequency controlled fully electronic switching point in telecommunication systems, in particular telephone systems

Publications (1)

Publication Number Publication Date
GB1116114A true GB1116114A (en) 1968-06-06

Family

ID=3592659

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3420266A Expired GB1116114A (en) 1965-08-02 1966-07-29 Electronic cross-point

Country Status (2)

Country Link
AT (1) AT249762B (en)
GB (1) GB1116114A (en)

Also Published As

Publication number Publication date
AT249762B (en) 1966-10-10

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