GB727586A - Automatic telephone systems with main exchanges and satellite exchanges - Google Patents
Automatic telephone systems with main exchanges and satellite exchangesInfo
- Publication number
- GB727586A GB727586A GB727586DA GB727586A GB 727586 A GB727586 A GB 727586A GB 727586D A GB727586D A GB 727586DA GB 727586 A GB727586 A GB 727586A
- Authority
- GB
- United Kingdom
- Prior art keywords
- relay
- exchanges
- exchange
- start circuit
- wire
- 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
- H04Q3/58—Arrangements providing connection between main exchange and sub-exchange or satellite
Landscapes
- Physics & Mathematics (AREA)
- Astronomy & Astrophysics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Monitoring And Testing Of Exchanges (AREA)
- Radio Relay Systems (AREA)
Abstract
727,586. Automatic exchange systems. LICENTIA PATENT-VERWALTUNGS GES. April 23, 1952 [April 24, 1951], No. 10219/52. Class 40 (4). In a switching centre receiving all operating current from an associated exchange and having a start circuit common to all the subscribers and normally connected over one wire of the junction to battery in the exchange, the setting up of an outgoing connection is initiated by the operation of a relay in the start circuit when earth is applied over the caller's loop to the start circuit. The start relay D is self-holding and releases a normally operated relay A which disconnects the start circuit from and connects the control circuit RW of a relay selector to the wire a of the junction AL1. In the exchange, the release of a normally operated relay A1 brings up relay W (not shown) which connects an impulse generator J to the wire a to operate the relay selector RW. The contacts 2 are actuated when the relay selector connects up the line of the caller T2.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEL8846A DE886765C (en) | 1951-04-24 | 1951-04-24 | Circuit arrangement for telephone systems with main and sub-offices |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB727586A true GB727586A (en) | 1951-04-06 |
Family
ID=25786750
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB727586D Expired GB727586A (en) | 1951-04-24 | Automatic telephone systems with main exchanges and satellite exchanges |
Country Status (6)
| Country | Link |
|---|---|
| BE (1) | BE510920A (en) |
| CH (1) | CH302752A (en) |
| DE (1) | DE886765C (en) |
| FR (1) | FR1055084A (en) |
| GB (1) | GB727586A (en) |
| NL (1) | NL83257C (en) |
-
0
- GB GB727586D patent/GB727586A/en not_active Expired
-
1951
- 1951-04-24 DE DEL8846A patent/DE886765C/en not_active Expired
-
1952
- 1952-04-19 CH CH302752D patent/CH302752A/en unknown
- 1952-04-23 FR FR1055084D patent/FR1055084A/en not_active Expired
- 1952-04-23 NL NL83257D patent/NL83257C/xx active
- 1952-04-24 BE BE510920D patent/BE510920A/xx unknown
Also Published As
| Publication number | Publication date |
|---|---|
| DE886765C (en) | 1953-08-17 |
| NL83257C (en) | 1956-06-15 |
| BE510920A (en) | 1952-05-15 |
| FR1055084A (en) | 1954-02-16 |
| CH302752A (en) | 1954-10-31 |
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