JPS6457539A - Three-stage switch - Google Patents
Three-stage switchInfo
- Publication number
- JPS6457539A JPS6457539A JP28199987A JP28199987A JPS6457539A JP S6457539 A JPS6457539 A JP S6457539A JP 28199987 A JP28199987 A JP 28199987A JP 28199987 A JP28199987 A JP 28199987A JP S6457539 A JPS6457539 A JP S6457539A
- Authority
- JP
- Japan
- Prior art keywords
- emergency
- switch circuit
- output terminal
- terminal
- input
- 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
Abstract
PURPOSE:To arrange such that the function of connecting any input terminal to any output terminal is not impaired even if any one of switch circuits of 1st to 3rd stage switches fails by providing an emergency line between the input and output terminals. CONSTITUTION:Emergency changeover switch circuits 4-1...4-N/n can choose whether a signal to be outputted to output terminals E1...En is to be routed through a 3rd stage switch circuits 3-1...3-N/n or through an emergency switch circuit 3-(N/n+1). While the connection between an input terminal T1 and the output terminal E1 becomes impossible if the 3rd switch circuit 3-1 fails, the input signal from the emergency switch circuit 3-(N/n+1) is switched to be outputted to the output terminal E1 by means of an emergency changeover switch circuit 4-1. Setting at the emergency switch circuit 3-(N/n+1) to connect a 1st input terminal to a 1st output terminal, and further setting at a 2nd stage switch circuit 2-1 to connect a 1st input terminal and an (N/n+1)-th output terminal, the input terminal T1 is connected again to the output terminal E1.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP28199987A JPH0821279B2 (en) | 1987-04-09 | 1987-11-10 | 3-step switch device |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62-52688 | 1987-04-09 | ||
JP5268887 | 1987-04-09 | ||
JP28199987A JPH0821279B2 (en) | 1987-04-09 | 1987-11-10 | 3-step switch device |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS6457539A true JPS6457539A (en) | 1989-03-03 |
JPH0821279B2 JPH0821279B2 (en) | 1996-03-04 |
Family
ID=26393330
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP28199987A Expired - Lifetime JPH0821279B2 (en) | 1987-04-09 | 1987-11-10 | 3-step switch device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0821279B2 (en) |
-
1987
- 1987-11-10 JP JP28199987A patent/JPH0821279B2/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
JPH0821279B2 (en) | 1996-03-04 |
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