GB831499A - Signalling system for carrier frequency telephone systems - Google Patents
Signalling system for carrier frequency telephone systemsInfo
- Publication number
- GB831499A GB831499A GB30874/56A GB3087456A GB831499A GB 831499 A GB831499 A GB 831499A GB 30874/56 A GB30874/56 A GB 30874/56A GB 3087456 A GB3087456 A GB 3087456A GB 831499 A GB831499 A GB 831499A
- Authority
- GB
- United Kingdom
- Prior art keywords
- carrier frequency
- signalling
- oct
- telephone systems
- frequencies
- 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
- H04J—MULTIPLEX COMMUNICATION
- H04J1/00—Frequency-division multiplex systems
- H04J1/02—Details
- H04J1/14—Arrangements providing for calling or supervisory signals
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Optical Communication System (AREA)
- Monitoring And Testing Of Exchanges (AREA)
Abstract
831,499. Automatic exchange systems. STAAT DER NEDERLANDEN TEN DEZE VERTEGENWOORDIGD DOOR DE DIRECTEUR - GENERAAL DER POSTERIJEN, TELEGRAFIE EN TELEFONIE, DE. Oct. 10, 1956 [Oct. 10, 1955], No. 30874/56. Drawings to Specification. Class 40 (4). In a system employing carrier working, one or more frequencies within the speech band are employed for signalling until selection is complete, after which the signalling frequencies to be effective must be preceded or accompanied by a control frequency outside the speech band, for example the carrier frequency. The circuit changes in the signal receiver are brought about in response to a backward end-of-selection signal.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL348427X | 1955-10-10 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB831499A true GB831499A (en) | 1960-03-30 |
Family
ID=19784970
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB30874/56A Expired GB831499A (en) | 1955-10-10 | 1956-10-10 | Signalling system for carrier frequency telephone systems |
Country Status (6)
Country | Link |
---|---|
BE (1) | BE551638A (en) |
CH (1) | CH348427A (en) |
DE (1) | DE1062747B (en) |
FR (1) | FR1192150A (en) |
GB (1) | GB831499A (en) |
NL (2) | NL104622C (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL267512A (en) * | 1960-07-25 | |||
DE1258914B (en) * | 1966-02-04 | 1968-01-18 | Telefunken Patent | Method for connecting subscriber stations to a telephone exchange with dialer operation via a carrier frequency path |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE454346A (en) * | 1943-03-08 | |||
DE863673C (en) * | 1951-06-29 | 1953-01-19 | Siemens Ag | Electrical signal receiver |
-
0
- NL NL201114D patent/NL201114A/xx unknown
- BE BE551638D patent/BE551638A/xx unknown
- NL NL104622D patent/NL104622C/xx active
-
1956
- 1956-10-04 CH CH348427D patent/CH348427A/en unknown
- 1956-10-05 DE DEST11768A patent/DE1062747B/en active Pending
- 1956-10-08 FR FR1192150D patent/FR1192150A/en not_active Expired
- 1956-10-10 GB GB30874/56A patent/GB831499A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
DE1062747B (en) | 1959-08-06 |
NL201114A (en) | |
CH348427A (en) | 1960-08-31 |
NL104622C (en) | |
BE551638A (en) | |
FR1192150A (en) | 1959-10-23 |
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