CN1053720A - A kind of looped-network inserter for optical-fibre interface - Google Patents
A kind of looped-network inserter for optical-fibre interface Download PDFInfo
- Publication number
- CN1053720A CN1053720A CN90100281A CN90100281A CN1053720A CN 1053720 A CN1053720 A CN 1053720A CN 90100281 A CN90100281 A CN 90100281A CN 90100281 A CN90100281 A CN 90100281A CN 1053720 A CN1053720 A CN 1053720A
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- China
- Prior art keywords
- optical
- network
- looped
- work station
- inserter
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Abstract
The invention belongs to technical field of optical fiber communication, be applicable to optical fiber communication network, annular LAN (Local Area Network) and data acquisition, communication and process control etc.The present invention has adopted looped-network inserter for optical-fibre interface, connects with optical fiber between each inserter for optical-fibre interface, and the looping optical fiber link, looped-network inserter for optical-fibre interface links to each other with work station.The present invention have the transmission rate height (＞10Mb/S), the looped network coverage big (the looped network girth is several to tens kilometers, stop spacing can 〉=advantage such as 2KM), also have power-down protection.
Description
The invention belongs to technical field of optical fiber communication, be applicable to optical fiber communication some areas looped network, annular LAN (Local Area Network) and data acquisition, communication and process control etc.
The token-passing ring net (Token Ring) of department of computer science, Tsinghua university development in 1988 is more advanced communication network, its theory diagram as shown in Figure 1,1-1 is a work station, 1-2 is for being electrically interposed in device, this netting gear has the efficiency of transmission height, is applicable to real-time processing environment, have priority facility, can be used for advantages such as process control environment.(" Token Ring develops technical report " the Tsing-Hua University Liangping, 1988.11) but this token-passing ring net still has weak point: 1. since this net be electrically interposed in the device response time long (be electrically interposed in relay is arranged in the device) and transmission medium is a twisted-pair feeder, limited transmission rate greatly, transmission rate is 4Mb/s at present; 2. the frequency characteristic of copper wires, loss characteristic have limited the coverage of network, and present maximum looped network girth has only 350 meters, and looped network only can be used in a building.
The objective of the invention is optical fiber transmission technique to be used for looped network,, enlarge topped scope, make it be more suitable for practicality to improve transmission rate in order to overcome the deficiency of existing looped network.
The present invention has adopted looped-network inserter for optical-fibre interface, connects with optical fiber between each inserter for optical-fibre interface, and the looping optical fiber link, inserter for optical-fibre interface links to each other with work station, and as shown in Figure 2,2-1 is a work station, and 2-2 is a looped-network inserter for optical-fibre interface.
The looped-network inserter for optical-fibre interface composition frame chart as shown in Figure 3, it is made up of optical switch 3-1,3-2, optical receiver 3-3, optical sender 3-4, adaptive power supply 3-5 and state controller 3-6,3-7 is a work station.When work station networks, after the start, the cpu instruction signal of work station 3-7 is by state controller 3-6, make optical switch 3-1,3-2 connect aa ' light path, the information that the ring upstream is come enters optical receiver 3-3 through optical switch 3-1, a optical fiber, after work station 3-7 processing, send by optical sender 3-4 again, deliver to downstream stations through a ' optical fiber, optical switch 3-2; When work station withdraws from looped network, the cpu instruction signal of work station 3-7 makes optical switch 3-1,3-2 connect bb ' light path by state controller 3-6, and the information that the ring upstream is come is through optical switch 3-1, bb ' optical fiber, optical switch 3-2, deliver to downstream stations, make optical information in the our station bypass; When work station was not worked, inserter for optical-fibre interface then kept bypass condition.
Looped-network inserter for optical-fibre interface also has the power down protection effect; i.e. a certain work station sudden power in looped network; then the looped-network inserter for optical-fibre interface that should stand guarantees that it is in the light bypass condition under the effect of adaptive power supply 3-5, and whole looped network still can normally be moved.
Advantage of the present invention is: 1. adopt looped-network inserter for optical-fibre interface, as transmission medium, improved transmission rate with optical fiber, make transmission rate more than 10Mb/S; 2. fibre loss is low, and the characteristic that chromatic dispersion is little has been expanded transmission range greatly, makes stop spacing 〉=2KM, and the looped network girth is more than several～tens kilometer, and the coverage of looped network can be expanded as one or several unit.
Embodiment:
Accompanying drawing 4 is embodiment of state controller, state controller is under the command signal control of work station CPU, optical switch is placed insertion or bypass condition, thereby the network access at Control work station and go out net, its course of work is: LM311 is a comparator, the homophase input, the command signal of work station CPU is imported by 1N, when command signal was high level, LM311 was output as high level, through not gate I
C2-1Become low level, at a point negative differential signal is arranged, this signal makes T
3, T
4The pipe conducting, d point current potential uprises, and makes T
5The pipe conducting; While not gate I
C2-2The output high level makes the b point that a forward differential signal, T be arranged
1, T
2Pipe ends, c point current potential step-down, T
6End, at this moment T
4The electric current of pipe is by OK, behind optical switch again by OK ', T
5The pipe circulation.Thereby the control optical switch places insertion (or bypass) state.If when the signal of 1N input is low level, make T
1, T
2, T
6The pipe conducting, T
3, T
4, T
5Pipe ends, and electric current is from OK ', optical switch, T
6The pipe circulation makes optical switch place bypass (or insertion) state.
Accompanying drawing 5 is embodiment of adaptive power supply.When inserter for optical-fibre interface is in the insertion operating state, the work station sudden power, inserter for optical-fibre interface is because of the effect of non-transformer optical switch out of hand, and fracture will appear in optical fiber loop like this, and signal can't transmit, and makes that whole looped network is at a standstill.Adaptive power supply can prevent that phenomenon occurs here; adaptive power supply is made up of two capacitors and two diodes; as shown in Figure 5; under the normal condition, capacitor is in charged state, and work station is in case outage; adaptive power supply is powered to state controller in during the optical switch response time; make the optical switch regular event, enter bypass condition, thereby the protection looped network normally moves.
Optical receiver among the present invention, optical sender are general-purpose device, and optical switch can adopt magnetic freeze mode optical switch.
Description of drawings:
Accompanying drawing 1 token-ring network theory diagram
The 1-1 work station
1-2 is electrically interposed in device
Accompanying drawing 2 has the looped network block diagram of inserter for optical-fibre interface
The 2-1 work station
The 2-2 looped-network inserter for optical-fibre interface
Accompanying drawing 3 looped-network inserter for optical-fibre interface composition frame charts
The 3-1 optical switch
The 3-2 optical switch
The 3-3 optical receiver
The 3-4 optical sender
The 3-5 adaptive power supply
The 3-6 state controller
The 3-7 work station
A, a ' optical fiber
B, b ' optical fiber
Accompanying drawing 4 state controller circuit diagrams
The LM311 comparator
I
C2-1, I
C2-2Not gate
T
1～T
6Triode
D
1～D
2Diode
R
1～R
10Resistance
C
1～C
2Electric capacity
A, B connect adaptive power supply
OK, OK ' connect optical switch
Accompanying drawing 5 adaptive power circuit figure
C
3～C
4Electric capacity
D
3～D
4Diode
Claims (2)
1, a kind of looped-network inserter for optical-fibre interface, it is characterized in that by optical switch 1,2, optical receiver, optical sender, adaptive power supply and state controller are formed, when work station was gone into looped network, after the start, the cpu instruction signal of work station made optical switch 1,2 connect light path by state controller, the information that the ring upstream is come enters optical receiver through optical switch by optical fiber, after the work station processing, send by optical sender again, deliver to downstream stations through optical fiber, another optical switch; When work station withdrawed from looped network, the cpu instruction signal of work station made optical switch 1,2 by state controller, connected light path, and the information that the ring upstream is come is sent downstream stations through optical switch, optical fiber, another optical switch, makes optical information in the our station bypass; When work station was not worked, inserter for optical-fibre interface kept bypass condition.
2, according to the said looped-network inserter for optical-fibre interface of claim 1, it is characterized in that said adaptive power supply is made up of two capacitors and two diodes, supply voltage charges to electric capacity by diode during operate as normal, during the work station outage, the voltage that fills on the electric capacity carries out instantaneous power supply to state controller, make the optical switch regular event enter bypass condition, guarantee that looped network normally moves.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN90100281A CN1018692B (en) | 1990-01-23 | 1990-01-23 | Looped-network inserter for optical-fibre interface |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN90100281A CN1018692B (en) | 1990-01-23 | 1990-01-23 | Looped-network inserter for optical-fibre interface |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1053720A true CN1053720A (en) | 1991-08-07 |
| CN1018692B CN1018692B (en) | 1992-10-14 |
Family
ID=4876572
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN90100281A Expired CN1018692B (en) | 1990-01-23 | 1990-01-23 | Looped-network inserter for optical-fibre interface |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1018692B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005122611A1 (en) * | 2004-06-08 | 2005-12-22 | Huawei Technologies Co., Ltd. | Circuit for realizing bypass function of the interface between chain-type-network base station and base station controller |
| CN111262622A (en) * | 2020-01-14 | 2020-06-09 | 国家计算机网络与信息安全管理中心 | Optical fiber line bypass protection device and method |
-
1990
- 1990-01-23 CN CN90100281A patent/CN1018692B/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005122611A1 (en) * | 2004-06-08 | 2005-12-22 | Huawei Technologies Co., Ltd. | Circuit for realizing bypass function of the interface between chain-type-network base station and base station controller |
| CN111262622A (en) * | 2020-01-14 | 2020-06-09 | 国家计算机网络与信息安全管理中心 | Optical fiber line bypass protection device and method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1018692B (en) | 1992-10-14 |
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| PB01 | Publication | ||
| C13 | Decision | ||
| GR02 | Examined patent application | ||
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| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |