GB1483806A - Telephone systems - Google Patents
Telephone systemsInfo
- Publication number
- GB1483806A GB1483806A GB52767/74A GB5276774A GB1483806A GB 1483806 A GB1483806 A GB 1483806A GB 52767/74 A GB52767/74 A GB 52767/74A GB 5276774 A GB5276774 A GB 5276774A GB 1483806 A GB1483806 A GB 1483806A
- Authority
- GB
- United Kingdom
- Prior art keywords
- counter
- ringing
- subset
- gate
- signal
- 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
- H04M—TELEPHONIC COMMUNICATION
- H04M3/00—Automatic or semi-automatic exchanges
- H04M3/42—Systems providing special services or facilities to subscribers
- H04M3/46—Arrangements for calling a number of substations in a predetermined sequence until an answer is obtained
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Sub-Exchange Stations And Push- Button Telephones (AREA)
- Telephonic Communication Services (AREA)
Abstract
1483806 Automatic exchange systems SIEMENS AG 6 Dec 1974 [20 Dec 1973] 52767/74 Heading H4K An arrangement including a counter for counting ringing tone bursts is provided in order to call a number of subscriber stations sequentially. The Figure shows an arrangement for controlling the ringing of two subsets. A counter comprising three bi-stable circuits ZK is provided which counts ringing signal bursts and the counter is coupled to gates G4 and G15 in such a manner that gate G4 receives an enabling signal on wire 6 whilst the counter is counting from 0 to 3 and gate G15 receives an enabling signal from gate G14 whilst the counter counts from 4 to 7, the process repeating for as long as the ringing signal persists to open and close contact 1ar. By means of the gates G4, G15, line switches AK1, AK2 are operated during the respective count ranges of counter ZK to cause calling signals to be supplied during alternate periods, of 4 ringing signal bursts to the pair of subsets. When the call is answered at a subset while it is being called, e.g. subset H, a circuit RS3, enabled during the subset's ringing period via gate G8, is switched by an input on wire 12 to hold the line switch AK1 via gate G4. Simultaneously switch 25 is closed and a binary 0 present on wire AU during the whole ringing operation is charged to 1 to reset the counter ZK. If a subset is busy when the exchange line provides ringing current, a respective switch 2S, 3S is closed to prevent an enabling signal being supplied to the respective one of circuits RS3, RS4. However the calling signal is still supplied to the busy subset. The arrangement can be modified to sequentially ring a greater number of subsets cyclically until one answers. The circuitry may be in monolithic integrated module form.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19732363582 DE2363582C3 (en) | 1973-12-20 | Circuit arrangement with call forwarding in a telephone system |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1483806A true GB1483806A (en) | 1977-08-24 |
Family
ID=5901423
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB52767/74A Expired GB1483806A (en) | 1973-12-20 | 1974-12-06 | Telephone systems |
Country Status (10)
Country | Link |
---|---|
AT (1) | AT337258B (en) |
BE (1) | BE823687A (en) |
CH (1) | CH580371A5 (en) |
DK (1) | DK141427C (en) |
FR (1) | FR2255763B1 (en) |
GB (1) | GB1483806A (en) |
IT (1) | IT1027669B (en) |
LU (1) | LU71515A1 (en) |
NL (1) | NL169010C (en) |
SE (1) | SE406022B (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3325435A1 (en) * | 1983-04-13 | 1984-10-18 | Elmeg Elektro-Mechanik Gmbh, 3150 Peine | TELEPHONE EXTENSION SYSTEM |
-
1974
- 1974-11-25 AT AT940874A patent/AT337258B/en not_active IP Right Cessation
- 1974-12-06 GB GB52767/74A patent/GB1483806A/en not_active Expired
- 1974-12-11 CH CH1651074A patent/CH580371A5/xx not_active IP Right Cessation
- 1974-12-13 IT IT30535/74A patent/IT1027669B/en active
- 1974-12-17 FR FR7441543A patent/FR2255763B1/fr not_active Expired
- 1974-12-18 LU LU71515A patent/LU71515A1/xx unknown
- 1974-12-19 DK DK666774A patent/DK141427C/en not_active IP Right Cessation
- 1974-12-20 BE BE151791A patent/BE823687A/en not_active IP Right Cessation
- 1974-12-20 NL NLAANVRAGE7416708,A patent/NL169010C/en not_active IP Right Cessation
- 1974-12-20 SE SE7416207A patent/SE406022B/en unknown
Also Published As
Publication number | Publication date |
---|---|
DE2363582B2 (en) | 1975-10-16 |
NL7416708A (en) | 1975-06-24 |
IT1027669B (en) | 1978-12-20 |
FR2255763A1 (en) | 1975-07-18 |
LU71515A1 (en) | 1975-06-17 |
BE823687A (en) | 1975-06-20 |
DE2363582A1 (en) | 1975-06-26 |
DK666774A (en) | 1975-08-18 |
DK141427B (en) | 1980-03-10 |
NL169010B (en) | 1981-12-16 |
SE7416207L (en) | 1975-06-23 |
FR2255763B1 (en) | 1982-10-29 |
ATA940874A (en) | 1976-10-15 |
DK141427C (en) | 1980-09-08 |
SE406022B (en) | 1979-01-15 |
AT337258B (en) | 1977-06-27 |
CH580371A5 (en) | 1976-09-30 |
NL169010C (en) | 1982-05-17 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed [section 19, patents act 1949] | ||
PCNP | Patent ceased through non-payment of renewal fee |