GB786821A - Circuit arrangements for markers in exchange systems, particularly telephone systems - Google Patents
Circuit arrangements for markers in exchange systems, particularly telephone systemsInfo
- Publication number
- GB786821A GB786821A GB3016255A GB3016255A GB786821A GB 786821 A GB786821 A GB 786821A GB 3016255 A GB3016255 A GB 3016255A GB 3016255 A GB3016255 A GB 3016255A GB 786821 A GB786821 A GB 786821A
- Authority
- GB
- United Kingdom
- Prior art keywords
- line
- wanted
- link
- group
- calling
- 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
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q3/00—Selecting arrangements
- H04Q3/0004—Selecting arrangements using crossbar selectors in the switching stages
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Sub-Exchange Stations And Push- Button Telephones (AREA)
- Exchange Systems With Centralized Control (AREA)
Abstract
786,821. Automatic exchange systems. STANDARD TELEPHONES & CABLES, Ltd. Oct. 21, 1955 [Oct. 29,1954], No. 30162/55. Drawings to Specification. Class 40 (4). The subscribers' lines are divided into groups; a calling line is extended to a free link circuit and the wanted number is then stored in one of a plurality of registers, an associated discriminating means determining the group to which the wanted line belongs and causing the seizure of a control circuit individual to that group, information relating to the wanted line then being transferred from the register to the control circuit which thereafter controls the establishment of the complete connection from the link circuit to the wanted line. The embodiment described is a private automatic branch exchange with a three-digit numbering scheme and containing a plurality of link circuits. Each link is connected at one end to a line-finder and at the other end to a group selector and contains switches on which dialled digits may be registered. A calling line is extended through a line-finder, or, if all the accessible line-finders are busy, through a final selector acting as a line-finder and through a further line-finder, to a link. On receiving dial tone the calling subscriber dials the wanted number. Each group of links is served by a control circuit known as an " internal marker " which includes so-called direction relays," one for each possible value of the first digit of a dialled number. Assuming that the associated internal marker is free, the registering of the first dialled digit causes the operation of the relevant direction relay. If the first digit indicates an external call, the direction relay causes the immediate seizure of an outgoing junction to a nearly public exchange. The connection of the calling line is transferred from the seized link to the junction, over which subsequently-dialled digits pass directly to the public exchange. Alternatively, a calling subscriber may release a seized link, in order to set up an external call directly, by depressing an earth key at his substation. In an internal call, the first digit indicates the group to which the wanted line belongs, and the direction relay causes the testing and seizure, if free, of a marker serving this group. When the link circuit has received and registered the complete wanted number (three digits), the second and third digits are transmitted to the seized marker over leads selected by the setting of the register switches. The marker then applies a marking to the wanted line and sets it to a " called " condition if it is free. In the present system, cross-bar switches are used, and the operation of the switch magnets corresponding to the wanted line brings about the completion of a test connection back from the wanted line through the various switching stages to the seized link circuit. This backward connection identifies an available route through the exchange, and the relevant switches thereupon operate substantially simultaneously, completing the connection between the calling and called lines. Ringing tone and ringing current are applied, and the markers are released. An incoming call seizes a link circuit and is extended to the wanted line in a similar manner to an internal call. Arrangements suitable for exchangers of different sizes are described.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEST8963A DE1001723B (en) | 1954-10-29 | 1954-10-29 | Circuit arrangement for establishing connections in telecommunications, in particular telephone systems with memories and markers |
Publications (1)
Publication Number | Publication Date |
---|---|
GB786821A true GB786821A (en) | 1957-11-27 |
Family
ID=7454643
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB3016255A Expired GB786821A (en) | 1954-10-29 | 1955-10-21 | Circuit arrangements for markers in exchange systems, particularly telephone systems |
Country Status (3)
Country | Link |
---|---|
CH (1) | CH363380A (en) |
DE (1) | DE1001723B (en) |
GB (1) | GB786821A (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1036326B (en) * | 1957-09-25 | 1958-08-14 | Telefonbau | Circuit arrangement for telecommunication, especially telephone systems with coordinate switches |
DE1229595B (en) * | 1962-06-20 | 1966-12-01 | Standard Elektrik Lorenz Ag | Circuit arrangement for two-stage coupling arrangements in telecommunications, in particular telephone switching systems |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL82983C (en) * | 1950-11-16 |
-
1954
- 1954-10-29 DE DEST8963A patent/DE1001723B/en active Pending
-
1955
- 1955-10-10 CH CH2515155A patent/CH363380A/en unknown
- 1955-10-21 GB GB3016255A patent/GB786821A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
CH363380A (en) | 1962-07-31 |
DE1001723B (en) | 1957-01-31 |
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