AU3304489A - Circuit arrangement for switching a switching device from normal switching operation to an emergency operation and conversely - Google Patents
Circuit arrangement for switching a switching device from normal switching operation to an emergency operation and converselyInfo
- Publication number
- AU3304489A AU3304489A AU33044/89A AU3304489A AU3304489A AU 3304489 A AU3304489 A AU 3304489A AU 33044/89 A AU33044/89 A AU 33044/89A AU 3304489 A AU3304489 A AU 3304489A AU 3304489 A AU3304489 A AU 3304489A
- Authority
- AU
- Australia
- Prior art keywords
- switching
- exchange line
- during
- transition
- call connection
- 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.)
- Granted
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
-
- 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
- H04Q3/62—Arrangements providing connection between main exchange and sub-exchange or satellite for connecting to private branch exchanges
- H04Q3/625—Arrangements in the private branch exchange
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Astronomy & Astrophysics (AREA)
- General Physics & Mathematics (AREA)
- Computer Networks & Wireless Communication (AREA)
- Telephonic Communication Services (AREA)
- Monitoring And Testing Of Exchanges (AREA)
- Circuit Arrangements For Discharge Lamps (AREA)
- Transmitters (AREA)
- Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
- Sub-Exchange Stations And Push- Button Telephones (AREA)
Abstract
To provide the possibility for an external call connection in the event of a fault preventing normal switching operation (mains failure, severe software error), a preferred subscriber station (T1) is directly connected to a predetermined exchange line. If such subscriber stations are conducting external calls when a fault occurs, these are not released during the transition from normal switching operation to emergency operation or during the transition in the reverse order to this. If the exchange line (AL1) is occupied by its associated preferred subscriber station (T1) via the corresponding connector unit (AS), the time delay otherwise existing during the switch-over of the change-over unit (U) is cancelled. If this exchange line (AL1) is seized by another subscriber (Tn), the existing call connection is released by the delayed switch-over. If a call connection exists for a preferred subscriber station, a switching path is first built up to the relevant connector unit (AS) during the transition from emergency mode to normal switching operation and the speech path is prepared. It is only then that the exchange line is connected to this preparatory path by the connector unit (U). <IMAGE>
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE3812666 | 1988-04-15 | ||
DE3812666A DE3812666A1 (en) | 1988-04-15 | 1988-04-15 | CIRCUIT ARRANGEMENT FOR SWITCHING A SWITCHING DEVICE FROM NORMAL SWITCHING OPERATION TO EMERGENCY OPERATION AND REVERSE |
Publications (2)
Publication Number | Publication Date |
---|---|
AU3304489A true AU3304489A (en) | 1989-10-19 |
AU608150B2 AU608150B2 (en) | 1991-03-21 |
Family
ID=6352101
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
AU33044/89A Ceased AU608150B2 (en) | 1988-04-15 | 1989-04-14 | Circuit arrangement for switching a switching device from normal switching operation to an emergency operation and conversely |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0337163B1 (en) |
AT (1) | ATE114101T1 (en) |
AU (1) | AU608150B2 (en) |
DE (2) | DE3812666A1 (en) |
ES (1) | ES2063066T3 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU618852B2 (en) * | 1988-10-19 | 1992-01-09 | Fujitsu Limited | Digital telephone set having an emergency switching function and communication system having the same |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FI103371B (en) | 1996-06-13 | 1999-06-15 | Nokia Telecommunications Oy | Method and system for ensuring emergency traffic |
FI103372B (en) * | 1996-06-20 | 1999-06-15 | Nokia Telecommunications Oy | Procedure and system for securing emergency traffic |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57107664A (en) * | 1980-12-25 | 1982-07-05 | Nitsuko Ltd | Electronic button telephone set |
GB2149615B (en) * | 1983-11-08 | 1987-04-15 | Standard Telephones Cables Ltd | Telephone exchange |
-
1988
- 1988-04-15 DE DE3812666A patent/DE3812666A1/en not_active Withdrawn
-
1989
- 1989-03-20 EP EP89104940A patent/EP0337163B1/en not_active Expired - Lifetime
- 1989-03-20 ES ES89104940T patent/ES2063066T3/en not_active Expired - Lifetime
- 1989-03-20 AT AT89104940T patent/ATE114101T1/en not_active IP Right Cessation
- 1989-03-20 DE DE58908616T patent/DE58908616D1/en not_active Expired - Fee Related
- 1989-04-14 AU AU33044/89A patent/AU608150B2/en not_active Ceased
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU618852B2 (en) * | 1988-10-19 | 1992-01-09 | Fujitsu Limited | Digital telephone set having an emergency switching function and communication system having the same |
Also Published As
Publication number | Publication date |
---|---|
ATE114101T1 (en) | 1994-11-15 |
EP0337163A2 (en) | 1989-10-18 |
EP0337163B1 (en) | 1994-11-09 |
DE58908616D1 (en) | 1994-12-15 |
EP0337163A3 (en) | 1991-07-31 |
ES2063066T3 (en) | 1995-01-01 |
DE3812666A1 (en) | 1989-11-02 |
AU608150B2 (en) | 1991-03-21 |
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