JPS5660121A - Circuit switching system - Google Patents
Circuit switching systemInfo
- Publication number
- JPS5660121A JPS5660121A JP13578279A JP13578279A JPS5660121A JP S5660121 A JPS5660121 A JP S5660121A JP 13578279 A JP13578279 A JP 13578279A JP 13578279 A JP13578279 A JP 13578279A JP S5660121 A JPS5660121 A JP S5660121A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- alarm
- signals
- response
- alarm signals
- 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.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/74—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission for increasing reliability, e.g. using redundant or spare channels or apparatus
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
Abstract
PURPOSE:To miniaturize a transmitter that includes a switch by exercising switching control in response to an alarm received from a terminal equipment. CONSTITUTION:When A circuit 20 is cut off, terminal equipments 21 and 24 send alarm signals to alarm receiving terminals 12 and 16 of circuit switches 25 and 26 as earth signals. In response to those alarm signals, logic circuits 13 and 17 of both the switches operate relays 14 and 18 to switch relay contacts 15 and 19. Consequently, A circuit 20 is changed over to B circuit 22. By the ceasing of alarm signals generated by terminal equipments 21 and 24, it can be made sure that the switching of both stations 25 and 26 is completed and a normal transmission line is constituted.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13578279A JPS5660121A (en) | 1979-10-19 | 1979-10-19 | Circuit switching system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13578279A JPS5660121A (en) | 1979-10-19 | 1979-10-19 | Circuit switching system |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5660121A true JPS5660121A (en) | 1981-05-23 |
Family
ID=15159718
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP13578279A Pending JPS5660121A (en) | 1979-10-19 | 1979-10-19 | Circuit switching system |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5660121A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61131921A (en) * | 1984-11-30 | 1986-06-19 | Nec Eng Ltd | Backup system by radio equipment at important line is at fault |
US5278989A (en) * | 1990-01-18 | 1994-01-11 | Andrew Corporation | Distributed amplifier network management system |
-
1979
- 1979-10-19 JP JP13578279A patent/JPS5660121A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61131921A (en) * | 1984-11-30 | 1986-06-19 | Nec Eng Ltd | Backup system by radio equipment at important line is at fault |
US5278989A (en) * | 1990-01-18 | 1994-01-11 | Andrew Corporation | Distributed amplifier network management system |
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