GB836583A - Improvements in or relating to automatic signalling systems - Google Patents
Improvements in or relating to automatic signalling systemsInfo
- Publication number
- GB836583A GB836583A GB9135/56A GB913556A GB836583A GB 836583 A GB836583 A GB 836583A GB 9135/56 A GB9135/56 A GB 9135/56A GB 913556 A GB913556 A GB 913556A GB 836583 A GB836583 A GB 836583A
- Authority
- GB
- United Kingdom
- Prior art keywords
- winding
- core
- line
- pulses
- 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
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)
- Devices For Supply Of Signal Current (AREA)
Abstract
836,583. Automatic exchange systems. PHILIPS ELECTRICAL INDUSTRIES Ltd. March 23, 1956 [March 28, 1955], No. 9135/56. Class 40 (4). Each subscriber's line at an exchange is associated with an individual magnetic core M which is normally magnetized to saturation by a biasing direct current passing through a winding L2 and a resistor R4, the core in addition being subjected to further magnetization in the same sense by periodic current pulses from a pulse generator IG. When a call is initiated by looping the line wires S1, S2, demagnetizing current which overcomes the bias and reverses the saturated state of the core is applied to a winding L1 over resistors R1, R2 and R3. The periodic pulses from IG are then able to induce voltages by transformer action in a winding L3 in such a direction as to fire a gas-filled tube B in a common call detector OD. Relay OR responds and starts a line finder OZ which shortcircuits winding L1 over the test wiper c when the calling line is found. The core restores to its original saturated state and induction of pulses in winding L3 terminates. In a modification the core is biased to saturation by a permanent magnet. It is stated that the windings L2 and L3 may be connected in series with corresponding windings of all the magnetic cores of a group of lines.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL345369X | 1955-03-28 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB836583A true GB836583A (en) | 1960-06-09 |
Family
ID=19784875
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB9135/56A Expired GB836583A (en) | 1955-03-28 | 1956-03-23 | Improvements in or relating to automatic signalling systems |
Country Status (6)
Country | Link |
---|---|
BE (1) | BE546459A (en) |
CH (1) | CH345369A (en) |
DE (1) | DE1001335B (en) |
FR (1) | FR1144856A (en) |
GB (1) | GB836583A (en) |
NL (2) | NL87154C (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL231776A (en) * | 1957-09-30 | |||
DE1053575B (en) * | 1957-09-30 | 1959-03-26 | Siemens Ag | Method and arrangement for preventing the loading of equipment by connecting an electrical dialer |
NL256763A (en) * | 1959-10-16 | |||
NL271594A (en) * | 1961-11-20 | |||
GB990601A (en) * | 1963-02-07 | 1965-04-28 | Ericsson Telephones Ltd | Telecommunication exchange apparatus |
-
0
- BE BE546459D patent/BE546459A/xx unknown
- NL NL196024D patent/NL196024A/xx unknown
- NL NL87154D patent/NL87154C/xx active
-
1956
- 1956-03-23 GB GB9135/56A patent/GB836583A/en not_active Expired
- 1956-03-24 DE DEN12015A patent/DE1001335B/en active Pending
- 1956-03-26 CH CH345369D patent/CH345369A/en unknown
- 1956-03-27 FR FR1144856D patent/FR1144856A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
DE1001335B (en) | 1957-01-24 |
FR1144856A (en) | 1957-10-18 |
BE546459A (en) | |
NL196024A (en) | |
CH345369A (en) | 1960-03-31 |
NL87154C (en) |
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