JPS5679552A - Loop back system for duplex loop transmission system - Google Patents
Loop back system for duplex loop transmission systemInfo
- Publication number
- JPS5679552A JPS5679552A JP15647279A JP15647279A JPS5679552A JP S5679552 A JPS5679552 A JP S5679552A JP 15647279 A JP15647279 A JP 15647279A JP 15647279 A JP15647279 A JP 15647279A JP S5679552 A JPS5679552 A JP S5679552A
- Authority
- JP
- Japan
- Prior art keywords
- loop back
- station
- loop
- post stage
- duplex
- 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
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/42—Loop networks
- H04L12/437—Ring fault isolation or reconfiguration
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Small-Scale Networks (AREA)
Abstract
PURPOSE:To enable general loop back instruction, by interrupting to the station at the post stage, even at loop back, and giving the function releasing the loop back to the station through the normal reception of the signal in loop back from the station of the post stage. CONSTITUTION:When general loop back instruction is received from a transmission line 3 via a receiver 21a, a decoder 27c interprete it, and a switching control circuit 27a gives a switching signal 32a to switching circuits 26c and 26d so that a transmission/reception control circuit 24 is inserted between the output of the receiver 21a and the input of transmission 22a, 22b. Thus, the general loop back instruction is in loop back through the transmitter 22b of a station 2a and transmitted to the station at the post stage with the transmitter 22a.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15647279A JPS5941620B2 (en) | 1979-12-03 | 1979-12-03 | Loopback method of dual loop transmission system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15647279A JPS5941620B2 (en) | 1979-12-03 | 1979-12-03 | Loopback method of dual loop transmission system |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5679552A true JPS5679552A (en) | 1981-06-30 |
JPS5941620B2 JPS5941620B2 (en) | 1984-10-08 |
Family
ID=15628490
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP15647279A Expired JPS5941620B2 (en) | 1979-12-03 | 1979-12-03 | Loopback method of dual loop transmission system |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5941620B2 (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5848548A (en) * | 1981-09-18 | 1983-03-22 | Fujitsu Ltd | Transmission line folding system |
JPS58138146A (en) * | 1982-02-10 | 1983-08-16 | Nippon Telegr & Teleph Corp <Ntt> | Folding control method of loop transmission system |
EP0091129A2 (en) * | 1982-04-07 | 1983-10-12 | Hitachi, Ltd. | Reconfiguration control method for a loop-type data network |
JPS5977739A (en) * | 1982-10-27 | 1984-05-04 | Hitachi Ltd | Loop network system of duplex system |
JPS59209927A (en) * | 1983-05-06 | 1984-11-28 | デンプスタ−・システムズ・インコ−ポレイテツド | Hoist mechanism for truck or trailer type automobile |
JPS6169234A (en) * | 1984-09-04 | 1986-04-09 | Oki Electric Ind Co Ltd | Loop transmitter and control system for countermeasure to loop transmission fault |
JPS61283254A (en) * | 1985-06-10 | 1986-12-13 | Canon Inc | Transmission control system |
-
1979
- 1979-12-03 JP JP15647279A patent/JPS5941620B2/en not_active Expired
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5848548A (en) * | 1981-09-18 | 1983-03-22 | Fujitsu Ltd | Transmission line folding system |
JPS58138146A (en) * | 1982-02-10 | 1983-08-16 | Nippon Telegr & Teleph Corp <Ntt> | Folding control method of loop transmission system |
EP0091129A2 (en) * | 1982-04-07 | 1983-10-12 | Hitachi, Ltd. | Reconfiguration control method for a loop-type data network |
US4530085A (en) * | 1982-04-07 | 1985-07-16 | Hitachi, Ltd. | Reconfiguration control method for a loop-type data network |
EP0091129B1 (en) * | 1982-04-07 | 1987-08-12 | Hitachi, Ltd. | Reconfiguration control method for a loop-type data network |
JPS5977739A (en) * | 1982-10-27 | 1984-05-04 | Hitachi Ltd | Loop network system of duplex system |
JPH0149066B2 (en) * | 1982-10-27 | 1989-10-23 | Hitachi Ltd | |
JPS59209927A (en) * | 1983-05-06 | 1984-11-28 | デンプスタ−・システムズ・インコ−ポレイテツド | Hoist mechanism for truck or trailer type automobile |
JPS6169234A (en) * | 1984-09-04 | 1986-04-09 | Oki Electric Ind Co Ltd | Loop transmitter and control system for countermeasure to loop transmission fault |
JPH0695687B2 (en) * | 1984-09-04 | 1994-11-24 | 沖電気工業株式会社 | Loop transmission failure countermeasure control method |
JPS61283254A (en) * | 1985-06-10 | 1986-12-13 | Canon Inc | Transmission control system |
Also Published As
Publication number | Publication date |
---|---|
JPS5941620B2 (en) | 1984-10-08 |
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