CN112087262A - One-way industrial network data transmission system and transmission method - Google Patents
One-way industrial network data transmission system and transmission method Download PDFInfo
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- CN112087262A CN112087262A CN202010961720.XA CN202010961720A CN112087262A CN 112087262 A CN112087262 A CN 112087262A CN 202010961720 A CN202010961720 A CN 202010961720A CN 112087262 A CN112087262 A CN 112087262A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/27—Arrangements for networking
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L63/00—Network architectures or network communication protocols for network security
- H04L63/02—Network architectures or network communication protocols for network security for separating internal from external traffic, e.g. firewalls
Abstract
The invention discloses a unidirectional industrial network data transmission system and a unidirectional industrial network data transmission method, which relate to the technical field of network data transmission and comprise a switch, a first photoelectric converter, an optical fiber, an optical isolator, a second photoelectric converter, a collection device and an analysis platform. The invention utilizes the one-way characteristic of the light and the reverse blocking function of the optical isolator to protect the industrial control network from transmitting data messages back by the acquisition device or avoiding abnormal risks of the control network switch caused by malicious light source injection from the acquisition device side while outputting network data to the outside.
Description
Technical Field
The invention relates to the technical field of network data transmission, in particular to a unidirectional industrial network data transmission system and a unidirectional industrial network data transmission method.
Background
In 1 month in 2003, the nuclear power station in ohio in the united states is attacked by SQL Slammer worm virus, the transmission quantity of network data is increased dramatically, the system is slowed down, and a control computer cannot work for a plurality of hours continuously. About 15 local time of 12/23/2015, 140 ten thousand residents in the capital and subsidiary part of Ukrainian and the west part of Ukran suddenly suffer a large-scale power failure for several hours, and at least three power areas are attacked. The electric company calls: due to the invasion of a company, 7 110KV substations and 23 35KV substations are failed, and 80000 users are powered off. The local time of 2016, 12 and 17 days is more than 23 points, every other year, the national power department of Ukran encounters hacker attacks again, the power failure lasts for about 30 minutes, and the affected area is the north of the capital assistance of Ukran and the surrounding areas. After 30 minutes, the engineer switches the equipment to manual mode and starts to resume power supply, and after 75 minutes the power supply is completely resumed.
The safety of an industrial control network is paid more and more attention, a network auditing system is also deployed in a control network in the traditional protection scheme except that a safety isolation device is deployed at the network boundary at present, flow auditing is carried out on the industrial control network, the system can carry out deep packet protocol analysis on an industrial control protocol in the network, intranet abnormal behaviors such as network attack, illegal operation, illegal equipment access and the like aiming at the industrial protocol are detected in real time, and abnormal data packets hidden in normal flow are found in time. When the system is deployed, software setting needs to be carried out on the switch, all the port data in use have a data mirror image function, the port data are copied in the switch and then sent to the acquisition device through the RJ45 network cable of the two-way communication, and then the port data are sent to the analysis platform from the acquisition device through the RJ45 network cable of the two-way communication.
When the acquisition device is abnormal or the configuration is wrong, an abnormal message can be reversely sent back to the switch, so that the response of the switch is reduced, the normal operation of other ports on the switch is influenced, and even the industrial control network is paralyzed due to the message penetration. Due to the particularities of 24 hour operation of an industrial network, the risk of such a functional disruption is unacceptable in an industrial control network. In reality, similar cases occur to cause the shutdown of a thermal power station control system, and the shutdown of the whole power station is triggered.
Therefore, those skilled in the art are devoted to develop a unidirectional industrial network data transmission system and transmission method.
Disclosure of Invention
In view of the above-mentioned defects of the prior art, the technical problem to be solved by the present invention is how to realize unidirectional data transmission from the switch to the collection device, so as to avoid the influence of the failure or abnormality of the collection device on the control network.
In order to achieve the purpose, the invention provides a unidirectional industrial network data transmission system and a transmission method. The photoelectric conversion device is characterized by comprising a switch, a first photoelectric converter, a first optical fiber, a second optical fiber, an optical isolator, a second photoelectric converter, a collecting device and an analysis platform.
Further, the switch is responsible for making a traffic copy of industrial network data and converting the industrial network data into an electrical signal to be output through an RJ45 network port, and the electrical signal is connected to the first photoelectric converter by using a network cable.
Further, the first optical-to-electrical converter is responsible for receiving the electrical signal on the RJ45 port output by the switch, converting the electrical signal into an optical signal, and outputting the optical signal to the outside from the optical fiber TX port of the optical-to-outside converter.
Further, the first optical fiber is responsible for transmitting the optical signal output by the first photoelectric converter to the optical isolator.
Further, the optical isolator is a passive device that limits the directivity of light, allowing only light to pass from the input side to the output side of the isolator, and allowing light to pass in one direction while preventing light from passing in the opposite direction.
Further, the second optical fiber is responsible for transmitting the optical signal output by the optical isolator to the second optical-to-electrical converter fiber RX port.
Further, the second photoelectric converter is responsible for converting optical signals received by the optical fiber RX port into electrical signals, outputting the electrical signals from the RJ45 network port, and connecting the electrical signals to the collecting device through a network cable.
Furthermore, the acquisition device is responsible for packaging and converging the acquired network traffic, and transmitting the converged data to the analysis platform through a network cable.
Furthermore, the analysis platform is responsible for analyzing the acquired multi-path network traffic data, and displaying and reusing an analysis result.
A unidirectional industrial network data transmission method is characterized by comprising the following steps:
step one, an industrial control network side switch starts a mirror image function, and all port data traffic in use is sent to a certain spare RJ45 network port;
step two, connecting the switch with the electrical port of the first photoelectric converter RJ45 by using a network cable;
step three, the first photoelectric converter converts the electrical signal on the RJ45 electrical port into an optical signal, and outputs the optical signal from the optical fiber TX port of the first photoelectric converter to the outside;
connecting a TX port of the first photoelectric converter and an input port of the optical isolator by using the first optical fiber;
fifthly, the optical isolator is used for ensuring that the optical signal output by the first photoelectric converter is transmitted to the second photoelectric converter in a one-way mode;
sixthly, connecting the optical isolator output port and an RX port of the second photoelectric converter by using the second optical fiber;
step seven, the second photoelectric converter converts the optical signal received on the optical fiber RX port into an electric signal, and the electric signal is output from an RJ45 electric port of the second photoelectric converter;
step eight, connecting the second photoelectric converter with the acquisition device by using a network cable;
and step nine, connecting the acquisition device with the analysis platform by using a network cable.
The technical effects are as follows:
1. by means of the one-way characteristic of the light and the reverse blocking function of the optical isolator, the industrial control network is protected doubly, when network data are output externally, the situation that data messages are transmitted back by the acquisition device or malicious light source injection is carried out from the acquisition device side is avoided, and therefore abnormal risks of the control network switch are caused.
2. The problem of providing data to external equipment from the inside of an industrial network safely and reliably is solved, and the data can be efficiently and conveniently acquired in the industrial control network.
The conception, the specific structure and the technical effects of the present invention will be further described with reference to the accompanying drawings to fully understand the objects, the features and the effects of the present invention.
Drawings
FIG. 1 is a schematic diagram of a unidirectional industrial network data transmission access scheme in accordance with a preferred embodiment of the present invention;
FIG. 2 is a diagram illustrating a unidirectional industrial network data transmission access scheme according to a second preferred embodiment of the present invention;
fig. 3 is a schematic diagram of a unidirectional industrial network data transmission access scheme according to a third preferred embodiment of the present invention.
Detailed Description
The technical contents of the preferred embodiments of the present invention will be more clearly and easily understood by referring to the drawings attached to the specification. The present invention may be embodied in many different forms of embodiments and the scope of the invention is not limited to the embodiments set forth herein. In the drawings, structurally identical elements are represented by like reference numerals, and structurally or functionally similar elements are represented by like reference numerals throughout the several views.
A one-way industrial network data transmission system comprises a switch, a first photoelectric converter, a first optical fiber, a second optical fiber, an optical isolator, a second photoelectric converter, a collecting device and an analysis platform.
The switch is responsible for carrying out flow duplication on industrial network data, converting the industrial network data into electric signals and outputting the electric signals through an RJ45 network port, and connecting the electric signals to the first photoelectric converter by using a network cable.
The first optical-to-electrical converter is responsible for receiving the electrical signal on the RJ45 port output by the switch, converting the electrical signal into an optical signal, and outputting the optical signal from the optical fiber TX port of the first optical-to-electrical converter to the outside.
The first optical fiber is responsible for transmitting the optical signal output by the first photoelectric converter to the optical isolator. The optical isolator is a passive device which is used for limiting the directivity of light, only allowing the light to emit from the input side to the output side of the isolator, enabling the light to pass in one direction and preventing the light from passing in the opposite direction, and is used for limiting the direction of the light and enabling the light to be transmitted only in one direction.
The second optical fiber is responsible for transmitting the optical signal output by the optical isolator to the second optical-to-electrical converter fiber RX port.
The second photoelectric converter is responsible for converting optical signals received by the optical fiber RX port into electric signals, outputting the electric signals from the RJ45 network port of the second photoelectric converter, and connecting the electric signals to the acquisition device through a network cable.
The acquisition device is responsible for packing and converging the acquired network flow, one acquisition device can be accessed to input data of a multi-path network, and the converged data is transmitted to the analysis platform through a network cable.
The analysis platform is responsible for analyzing the acquired multi-channel network traffic data (one analysis platform can access the data of the multi-channel acquisition device), and displaying or recycling the analysis result.
The access scheme has the following mechanism for realizing the one-way transmission characteristic:
the data flow from the sending end to the receiving end can be completed only by the simultaneous existence of the sending TX end light source, the transmission medium optical fiber and the receiving RX end sensor in the optical fiber transmission data. And due to the unidirectional light, namely, light is only emitted from the TX port at the light source side to the RX port at the receiving sensing side, and no light source drive is adopted to realize data transmission. The unidirectionality of the entire link is physically ensured.
Transmission method as shown in fig. 1, data will be sent from left to right:
step 1, the industrial control network side switch starts a mirror image function, and sends all port data traffic in use to a certain spare RJ45 network port.
And 2, connecting the switch with an electrical port of the first photoelectric converter RJ45 by using a network cable.
And step 3, converting the electrical signal on the RJ45 electrical port into an optical signal by the first photoelectric converter, and outputting the optical signal from the optical fiber TX port of the first photoelectric converter to the outside.
And 4, connecting a TX port of the first photoelectric converter and an input port of the optical isolator by using a first optical fiber.
And 5, using an optical isolator to ensure that the optical signal output by the first photoelectric converter is transmitted to the second photoelectric converter in a single direction.
And 6, connecting the output port of the optical isolator and the RX port of the second photoelectric converter by using a second optical fiber.
And 7, converting the optical signal received by the optical fiber RX port into an electric signal by the second photoelectric converter, and outputting the electric signal from the RJ45 electric port to the outside.
And 8, connecting the second photoelectric converter with the acquisition device by using a network cable.
And 9, connecting the acquisition device with the analysis platform by using a network cable.
Example two is as follows:
if the industrial control network switch is close to the acquisition device, the risk that the far end is maliciously utilized does not exist, and due to cost consideration, an optical isolator can be omitted, the unidirectional optical fiber is directly connected to the RX port of the second photoelectric converter, and the function of unidirectional industrial network data transmission can be achieved.
A unidirectional industrial network data transmission system comprises a switch, a first photoelectric converter, an optical fiber, a second photoelectric converter, a collecting device and an analysis platform.
The switch is responsible for carrying out flow duplication on industrial network data, converting the industrial network data into electric signals and outputting the electric signals through an RJ45 network port, and connecting the electric signals to the first photoelectric converter by using a network cable.
The first optical-to-electrical converter is responsible for receiving the electrical signal on the RJ45 port output by the switch, converting the electrical signal into an optical signal, and outputting the optical signal from the optical fiber TX port of the first optical-to-electrical converter to the outside.
The optical fiber is responsible for transmitting the optical signal output by the first optical-to-electrical converter TX port to the second optical-to-electrical converter RX port.
And the second photoelectric converter is responsible for converting the optical signal received by the optical fiber RX port into an electric signal, outputting the electric signal from the RJ45 network port of the second photoelectric converter, and connecting the electric signal to the acquisition device through a network cable.
And the acquisition device is responsible for packaging and converging the acquired network flow, one acquisition device can be accessed to input data of a multi-path network, and the converged data is transmitted to the analysis platform through a network cable.
And the analysis platform is responsible for analyzing the acquired multi-path network flow data (one analysis platform can access the data of the multi-path acquisition device), and displaying or reusing an analysis result.
Transmission method as shown in fig. 2, data will be sent from left to right:
step 1, the industrial control network side switch starts a mirror image function, and sends all port data traffic in use to a certain spare RJ45 network port.
And 2, connecting the switch with an electrical port of the first photoelectric converter RJ45 by using a network cable.
And step 3, converting the electrical signal on the RJ45 electrical port into an optical signal by the first photoelectric converter, and outputting the optical signal from the optical fiber TX port of the first photoelectric converter to the outside.
And 4, connecting the TX port of the first photoelectric converter and the RX port of the second photoelectric converter by using an optical fiber.
And 5, converting the optical signal received by the optical fiber RX port into an electric signal by the second photoelectric converter, and outputting the electric signal from the RJ45 electric port to the outside.
And 6, connecting the second photoelectric converter with the acquisition device by using a network cable.
And 7, connecting the acquisition device with the analysis platform by using a network cable.
Example three is as follows:
if the switch supports the single-fiber single-transmission function of the optical fiber, the first photoelectric converter can be omitted, the unidirectional optical fiber is directly connected into the optical isolator, and the function of unidirectional transmission of industrial network data can be realized. At present, common switches of the industrial network do not have the function, and the function is only provided for a few latest commercial switches, and the realization cost is higher.
A one-way industrial network data transmission system comprises a switch, a first optical fiber, an optical isolator, a second optical fiber, a photoelectric converter, a collecting device and an analysis platform.
The switch is responsible for carrying out flow duplication on industrial network data, converting the industrial network data into optical signals and outputting the optical signals through an optical fiber TX port, and connecting the optical signals to the photoelectric converter by using optical fibers.
The first optical fiber is responsible for transmitting the optical signal output by the switch to the optical isolator.
The optical isolator is a passive device which is used for limiting the directivity of light, only allowing the light to emit from the input side to the output side of the isolator, enabling the light to pass in one direction and preventing the light from passing in the opposite direction, and is used for limiting the direction of the light and enabling the light to be transmitted only in one direction.
The second optical fiber is responsible for transmitting the optical signal output by the optical isolator to the optical-to-electrical converter fiber RX port.
The photoelectric converter is responsible for converting optical signals received by the optical fiber RX port into electric signals, outputting the electric signals from the RJ45 network port of the optical fiber RX port, and connecting the electric signals to the acquisition device through a network cable.
The acquisition device is responsible for packing and converging the acquired network flow, one acquisition device can be accessed to input data of a multi-path network, and the converged data is transmitted to the analysis platform through a network cable.
The analysis platform is responsible for analyzing the acquired multi-channel network traffic data (one analysis platform can access the data of the multi-channel acquisition device), and displaying or recycling the analysis result.
Transmission method as shown in fig. 3, data will be sent from left to right:
step 1, the industrial control network side switch starts a mirror image function, sends all port data traffic in use to a certain spare optical fiber network port, and starts a single-fiber single-sending mode.
And 2, connecting the TX port of the switch and the input port of the optical isolator by using a first optical fiber.
And 3, using an optical isolator to ensure that the optical signal output by the switch is transmitted to the photoelectric converter in a one-way mode.
And 4, connecting the output port of the optical isolator and the RX port of the photoelectric converter by using a second optical fiber.
Step 5, the photoelectric converter converts the optical signal received on the optical fiber RX port into an electrical signal, and the electrical signal is output from the RJ45 electrical port to the outside
And 6, connecting the second photoelectric converter with the acquisition device by using a network cable.
And 7, connecting the acquisition device with the analysis platform by using a network cable.
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.
Claims (10)
1. The utility model provides a one-way industrial network data transmission system which characterized in that, includes switch, first photoelectric converter, first optic fibre, second optic fibre, optical isolator, second photoelectric converter, collection system and analysis platform.
2. A unidirectional industrial network data transmission system as claimed in claim 1 wherein the switch is responsible for traffic replication of industrial network data and converting it to electrical signals for output through an RJ45 network port, connected to the first opto-electric converter using a network cable.
3. A unidirectional industrial network data transmission system as claimed in claim 1 wherein said first optical-to-electrical converter is responsible for receiving electrical signals at the RJ45 port output by said switch, converting them into optical signals, and outputting optical signals externally from its fiber TX port.
4. A unidirectional industrial network data transmission system as claimed in claim 1 wherein said first optical fiber is responsible for transmitting the optical signal output by said first opto-electronic converter to said opto-isolator.
5. A unidirectional industrial network data transmission system as claimed in claim 1 wherein the optical isolator is responsible for limiting the directionality of light, allowing only light to pass from the input side to the output side of the isolator, is a passive device that allows light to pass in one direction and prevents light from passing in the opposite direction.
6. A unidirectional industrial network data transmission system as claimed in claim 1 wherein said second optical fibre is responsible for transmitting the optical signal output by said optical isolator to said second opto-electric converter fibre RX port.
7. A unidirectional industrial network data transmission system as claimed in claim 1 wherein the second optical to electrical converter is responsible for converting optical signals received at an optical fibre RX port to electrical signals and output from its RJ45 network port for connection to the acquisition device via a network cable.
8. The unidirectional industrial network data transmission system of claim 1, wherein the acquisition device is responsible for packaging and converging the acquired network traffic and transmitting the converged data to the analysis platform through a network cable.
9. The unidirectional industrial network data transmission system of claim 1, wherein the analysis platform is responsible for analyzing the acquired multipath network traffic data, and displaying and reusing the analysis result.
10. A unidirectional industrial network data transmission method is characterized by comprising the following steps:
step one, an industrial control network side switch starts a mirror image function, and all port data traffic in use is sent to a certain spare RJ45 network port;
step two, connecting the switch with the electrical port of the first photoelectric converter RJ45 by using a network cable;
step three, the first photoelectric converter converts the electrical signal on the RJ45 electrical port into an optical signal, and outputs the optical signal from the optical fiber TX port of the first photoelectric converter to the outside;
connecting a TX port of the first photoelectric converter and an input port of the optical isolator by using the first optical fiber;
fifthly, the optical isolator is used for ensuring that the optical signal output by the first photoelectric converter is transmitted to the second photoelectric converter in a one-way mode;
sixthly, connecting the optical isolator output port and an RX port of the second photoelectric converter by using the second optical fiber;
step seven, the second photoelectric converter converts the optical signal received on the optical fiber RX port into an electric signal, and the electric signal is output from an RJ45 electric port of the second photoelectric converter;
step eight, connecting the second photoelectric converter with the acquisition device by using a network cable;
and step nine, connecting the acquisition device with the analysis platform by using a network cable.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113489541A (en) * | 2021-08-18 | 2021-10-08 | 浙江国利网安科技有限公司 | One-way data transmission device for industrial control safety scene |
| CN113489542A (en) * | 2021-08-18 | 2021-10-08 | 浙江国利网安科技有限公司 | One-way data transmission device for industrial control safety scene |
| CN113965262A (en) * | 2021-09-10 | 2022-01-21 | 飞昂创新科技南通有限公司 | Network cable |
| CN113992372A (en) * | 2021-10-20 | 2022-01-28 | 国网辽宁省电力有限公司盘锦供电公司 | Optical isolation one-way network data transmission device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113489541A (en) * | 2021-08-18 | 2021-10-08 | 浙江国利网安科技有限公司 | One-way data transmission device for industrial control safety scene |
| CN113489542A (en) * | 2021-08-18 | 2021-10-08 | 浙江国利网安科技有限公司 | One-way data transmission device for industrial control safety scene |
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Application publication date: 20201215 |