CN110794971B - Remote control equipment and system - Google Patents
Remote control equipment and system Download PDFInfo
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- CN110794971B CN110794971B CN201811651403.7A CN201811651403A CN110794971B CN 110794971 B CN110794971 B CN 110794971B CN 201811651403 A CN201811651403 A CN 201811651403A CN 110794971 B CN110794971 B CN 110794971B
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/033—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor
- G06F3/0354—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor with detection of 2D relative movements between the device, or an operating part thereof, and a plane or surface, e.g. 2D mice, trackballs, pens or pucks
- G06F3/03543—Mice or pucks
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/02—Input arrangements using manually operated switches, e.g. using keyboards or dials
- G06F3/0202—Constructional details or processes of manufacture of the input device
- G06F3/0219—Special purpose keyboards
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/033—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor
- G06F3/038—Control and interface arrangements therefor, e.g. drivers or device-embedded control circuitry
- G06F3/0383—Signal control means within the pointing device
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
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- General Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Human Computer Interaction (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Input From Keyboards Or The Like (AREA)
Abstract
The embodiment of the invention provides remote control equipment and a system, which are used for meeting the requirement of remote operation in emergency treatment. The equipment comprises a keyboard mouse simulator, a video signal collector and a transfer host; the keyboard mouse simulator is used for converting a keyboard mouse signal received from the transferring host into a serial signal, decoding and converting the serial signal into a keyboard control signal and a mouse control signal, and sending the keyboard mouse signal and the mouse control signal to the target host; the video signal collector is used for collecting signals displayed by the target host and transmitting the collected signals to the back-end host through the transfer host; the transfer host is used for receiving a keyboard and mouse signal sent by an emergency disposal personnel on the back-end host and sending the keyboard and mouse signal to the keyboard and mouse simulator; the system is used for receiving the signals acquired by the video signal acquisition device and sending the signals to the back-end host; the keyboard mouse simulator, the video signal collector and the transit host are located at the site where the network security event occurs.
Description
Technical Field
The present invention relates to the field of network security technologies, and in particular, to a remote control device and a system.
Background
At present, network security events are frequent and distributed across the country, experienced emergency response personnel are severely insufficient, and often are difficult to handle at the first time the network security event occurs to arrive at the scene.
When a network security event occurs, emergency response personnel are often unable to remotely perform emergency treatment by directly accessing the network where the network security event occurs, typically due to network paralysis in the field or in order to avoid problematic devices infecting other devices through the network.
In summary, after a network security event occurs, it is difficult for emergency responders to conduct remote emergency treatments over the network.
Disclosure of Invention
The embodiment of the invention provides remote control equipment and a system, which are used for meeting the requirement of remote operation in emergency treatment.
Based on the above problems, the remote control device provided by the embodiment of the invention comprises a keyboard mouse simulator, a video signal collector and a transfer host;
the keyboard mouse simulator is used for converting a keyboard mouse signal received from the transferring host into a serial signal, decoding and converting the serial signal into a keyboard control signal and a mouse control signal, and sending the keyboard mouse control signal and the mouse control signal to the target host; the keyboard and mouse signals received by the transit host are keyboard and mouse signals sent by emergency disposal personnel on the back-end host;
the video signal collector is used for collecting signals displayed by the target host and sending the collected signals to the back-end host through the transfer host;
the transfer host is used for receiving a keyboard and mouse signal sent by emergency disposal personnel on the back-end host and sending the keyboard and mouse signal to the keyboard and mouse simulator; and the video signal acquisition unit is used for acquiring the video signal and sending the video signal to the back-end host;
the keyboard mouse simulator, the video signal collector and the transit host are located on the site where the network security event occurs.
The remote control system provided by the embodiment of the invention comprises a transfer server, a back-end host and the remote control equipment provided by the embodiment of the invention.
The beneficial effects of the embodiment of the invention include:
the embodiment of the invention provides remote control equipment and a remote control system, wherein a keyboard mouse simulator converts a keyboard mouse signal received from a relay host into a serial signal, decodes and converts the serial signal into a keyboard control signal and a mouse control signal, and sends the keyboard control signal and the mouse control signal to a target host; the keyboard and mouse signals received by the transit host are keyboard and mouse signals sent by emergency disposal personnel on the back-end host; the video signal collector collects signals displayed by the target host and sends the collected signals to the back-end host through the transfer host; the transfer host receives a keyboard and mouse signal sent by emergency disposal personnel on the back-end host and sends the keyboard and mouse signal to the keyboard and mouse simulator; receiving the signals acquired by the video signal acquisition unit and sending the signals to the back-end host; the back-end host is prevented from being directly connected with the target host through the network by the keyboard mouse simulator, the video signal collector and the transfer host, the risk of being infected is reduced, and meanwhile emergency response personnel can remotely conduct safety emergency treatment.
Drawings
Fig. 1 is a schematic structural diagram of a remote control device according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of another remote control device according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of still another remote control device according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of still another remote control device according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of still another remote control device according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a keyboard mouse simulator according to an embodiment of the present invention in an actual application scenario;
fig. 7 is a schematic structural diagram of a keyboard mouse simulator according to an embodiment of the present invention in another practical application scenario.
Detailed Description
According to the remote control equipment and the remote control system, the rear-end host is prevented from being directly connected with the target host through the network by the keyboard mouse simulator, the video signal collector and the transfer host, so that the risk of infection is reduced, and meanwhile, emergency response personnel can remotely perform safe emergency treatment.
The following describes a specific implementation of a remote control device and a system according to an embodiment of the present invention with reference to the drawings.
The embodiment of the invention provides remote control equipment, as shown in fig. 1, which comprises a keyboard mouse simulator 11, a video signal collector 12 and a transfer host 13;
the keyboard mouse simulator 11 is configured to convert a keyboard mouse signal received from the host computer 13 into a serial signal, decode the serial signal into a keyboard control signal and a mouse control signal, and send the signals to the target host computer 14; the keyboard and mouse signals received by the transit host 13 are keyboard and mouse signals sent by emergency disposal personnel on the back-end host 15;
the video signal collector 12 collects signals of the target host 14 and sends the collected signals to the back-end host 15 through the transit host 13;
the transit host 13 is configured to receive a keyboard and mouse signal sent by an emergency disposal personnel on the back-end host 15, and send the keyboard and mouse signal to the keyboard and mouse simulator 11; and is configured to receive the signal acquired by the video signal acquirer 12 and transmit the signal to the back-end host 15;
wherein the keyboard mouse simulator 11, the video signal collector 12 and the transit host 13 are located at the site where the network security event occurs.
Further, as shown in fig. 2, the relay host 13 and the back-end host 15 encrypt and forward signals through the relay server 21, where the encrypted and forwarded signals include the signals collected by the keyboard mouse signal and the video signal collector.
Before the signal is encrypted and forwarded, the relay server needs to determine that the key of the connection initiated by the relay host to the relay server is the same as the key of the connection initiated by the back-end host to the relay server.
The key can be dynamically generated by the back-end host, and the key is notified to the staff on the side of the transfer host through other communication modes such as telephone, and after the transfer host and the back-end host initiate connection to the transfer server at the same time, the staff inputs the obtained key, and then the same connection is established.
In practical application, the video signal collector can convert the collected video signal into a real-time streaming protocol (RSTP, real Time Streaming Protocol) rtsp streaming service, and send the rtsp streaming service to the transit host through a 554 port; the keyboard mouse simulator can be connected with the transit host through an RS232 interface, and can convert a network protocol data packet carrying a keyboard mouse signal into an RS232 protocol data packet and send the RS232 protocol data packet to the keyboard mouse simulator in the middle and special period.
The transfer host, the transfer server and the back-end server can adopt a tunnel communication mode to transmit data packets, including data packets of RSTP streaming service and data packets of keyboard and mouse signals. For example, in practical application, the back-end host can notify the relay server to monitor 127.0.0.1:28880 and 127.0.0.1:554 simultaneously, encrypt the data packet of the keyboard and mouse signal, and forward the encrypted data packet to the relay host through the relay server; the transfer host receives and encrypts the data packet of the RSTP streaming service and then returns to the transfer server in real time; the transfer server only forwards the data packet and does not decrypt the data packet.
Before the data packet is transferred by adopting the tunnel communication mode among the transfer host, the transfer server and the back-end server, because the server can simultaneously transfer a plurality of tunnel data, different communication can complete data transfer in different encryption tunnels so as not to be interfered with each other due to the safety consideration. And (3) carrying out security authentication in the tunnel connection process, wherein each tunnel is provided with unique ID information and a password, when the two ends initiating connection are identical in ID and password in the connection process, the tunnels can be connected, the data packet can be forwarded, and otherwise, the connection is refused. After the connection is successfully established, in order to ensure the communication security, the data packet may be AES256 encrypted in the tunnel data packet forwarding process.
Optionally, as shown in fig. 3, the keyboard/mouse simulator provided in the embodiment of the present invention includes a first signal plug 31, a first conversion circuit 32, a keyboard/mouse signal simulation circuit 33, and a second signal plug 34;
a first conversion circuit 32 for converting a keyboard mouse signal received from the relay host 13 through the first signal plug 31 into a serial signal;
the keyboard and mouse signal analog circuit 33 is configured to receive the serial signal through its signal receiving end, decode and convert the serial signal into a keyboard control signal and a mouse control signal, and send the signals to the target host 14 through the second signal plug 34; the signal transmitting end of the keyboard mouse signal simulation circuit 33 is suspended;
wherein the target host 14 and the relay host 13 are located at the site where the network security event occurs.
In the keyboard mouse simulator provided by the embodiment of the invention, after the first conversion circuit converts the keyboard mouse signal received from the transit host through the first signal plug into the serial signal, the keyboard mouse signal simulation circuit is suspended due to the signal transmitting end, that is, the equipment with the security event (namely the transit host) cannot send any signal to the transit host and the back-end host through the keyboard mouse signal simulation circuit, the first conversion circuit and the first signal plug, so that the equipment with the security event is prevented from being infected with other equipment through a network; in addition, the keyboard and mouse signal analog circuit only receives the serial signal through the signal receiving end, decodes and converts the serial signal into the keyboard control signal and the mouse control signal, and sends the serial signal to the target host through the second signal plug, so that the equipment (namely the target host) with the security event can receive the keyboard and mouse signals sent by the back-end host through the network, the transit host, the first signal plug, the first conversion circuit, the keyboard and mouse signal analog circuit and the second signal plug, and the emergency response personnel can access the network to carry out remote emergency treatment on the security event on the premise of avoiding the equipment from being infected.
The keyboard and mouse signal analog circuit can be realized by a micro control unit (Microcontroller Unit, MCU), decodes the received serial signal by writing specific firmware, and converts the received serial signal into a corresponding keyboard control signal and mouse control signal.
The first signal plug and the second signal plug may be universal serial bus (Universal Serial Bus) interfaces; the first signal plug can also be a parallel interface, or other various network interfaces, wireless or Bluetooth interfaces and the like, and correspondingly, the part of the first conversion circuit for carrying out signal transmission with the first signal plug also needs to be correspondingly adjusted according to the type of the interface; the second signal plug can also be a PS2 interface, and of course, since both the keyboard control signal and the mouse control signal need to be transmitted, the second signal plug can be two PS2 interfaces; of course, the second signal plug may be other interfaces capable of transmitting keyboard control signals and mouse control signals.
Further, in order to avoid the reverse transmission of the interference signal, that is, to avoid the transmission of the interference signal from the target host side to the relay host side, as shown in fig. 4, the keyboard mouse simulator provided by the embodiment of the invention further includes an isolation circuit 41;
the isolation circuit 41 is configured to receive the serial signal from the first conversion circuit 32, and send the received serial signal to the keyboard mouse signal analog circuit 33 in a coupling manner, so as to avoid that an interference signal of the target host side is reversely transferred to the relay host 13.
In practical implementation, the isolation circuit 41 may be an electromagnetic isolation circuit, an optical coupling isolation circuit, or other types of isolation circuits.
When the isolation circuit is an optical coupling isolation circuit, the input end of the optical coupling isolation circuit receives serial signals from the first conversion circuit, and the output end of the optical coupling isolation circuit is connected with the signal receiving end of the keyboard mouse signal analog circuit; the optocoupler isolation circuit may be such that there is no direct electrical connection between the two isolated circuits.
When the isolation circuit is an electromagnetic isolation circuit, the input end of the electromagnetic isolation circuit receives serial signals from the first conversion circuit, and the output end of the electromagnetic isolation circuit is connected with the signal receiving end of the keyboard mouse signal simulation circuit; wherein, the ground signal of the input side of the electromagnetic isolation circuit is different from the ground signal of the output side of the electromagnetic isolation circuit. The input side and the output side of the electromagnetic isolation circuit are respectively and independently powered in different power supply loops, so that signal isolation can be realized from a physical layer, the signals can be only transmitted in one direction, various interference signals cannot be transmitted reversely through ground signals, the safety of data is fundamentally ensured, and the possibility of data leakage of a target host is eliminated.
Further, as shown in fig. 5, the keyboard mouse simulator provided in the embodiment of the present invention further includes a log recording circuit 51;
the log recording circuit 51 is configured to record the keyboard control signal output by the keyboard mouse signal analog circuit.
That is, the keyboard-mouse signal analog circuit analyzes the serial signal to identify the keyboard control signal and the mouse control signal therein, and only transmits the keyboard control signal therein to the log recording circuit so as to store only the keyboard control signal.
When the working levels of the keyboard mouse signal simulation circuit and the log recording circuit are inconsistent, the log recording circuit comprises a level conversion circuit, a secure digital card reader and a secure digital card; the level conversion circuit provides proper working level for the safety digital card reader, and the safety digital card reader writes the received keyboard control signal into the safety digital card.
In a specific application scenario, the first signal plug and the second signal plug are both USB plugs, the first conversion circuit is a USB serial conversion circuit, and the isolation circuit is an electromagnetic isolation circuit.
In fig. 6, a USB plug connected to a USB serial conversion circuit is a first signal plug, the USB serial conversion circuit converts a keyboard mouse signal received through the USB plug into a serial signal, the serial signal is transmitted to an electromagnetic isolation circuit through a signal output TXD pin of the USB serial conversion circuit, the electromagnetic isolation circuit transmits the signal to a signal receiving end D0/RX of a keyboard mouse signal analog circuit through electromagnetic coupling, a signal transmitting end D1/TX of the keyboard mouse signal analog circuit is suspended, and the keyboard mouse signal analog circuit converts the received signal into a keyboard control signal and a mouse control signal to be transmitted to a target host through a second signal plug, that is, another USB plug.
In fig. 6, the ground signals at the input side of the electromagnetic isolation circuit are the same as the ground signals of the USB serial conversion circuit, and are both uirtgnd, and the ground signals at the output side of the electromagnetic isolation circuit are the same as the ground signals of the keyboard mouse signal analog circuit, so that the isolation between the input side ground signals and the output side ground signals of the electromagnetic isolation circuit is realized.
In another specific application scenario, the first signal plug and the second signal plug are both USB plugs, the first conversion circuit is a USB serial conversion circuit, and the isolation circuit is an optocoupler isolation circuit.
In fig. 7, a USB plug connected to the USB serial conversion circuit is a first signal plug, the USB serial conversion circuit converts a keyboard mouse signal received through the USB plug into a serial signal, the serial signal is transmitted to the optocoupler isolation circuit through a signal output TXD pin of the USB serial conversion circuit, the optocoupler isolation circuit transmits the signal to a signal receiving end D0/RX of the keyboard mouse signal analog circuit through photoelectric coupling, a signal transmitting end D1/TX of the keyboard mouse signal analog circuit is suspended, and the keyboard mouse signal analog circuit converts the received signal into a keyboard control signal and a mouse control signal to be transmitted to a target host through a second signal plug, that is, another USB plug.
In the circuits shown in fig. 6 and 7, a log recording circuit may be further connected to the SCK pin (clock signal pin), MOSI pin (serial data input pin), and MISO pin (serial data output pin) of the keyboard-mouse signal analog circuit, thereby recording the keyboard control signal.
In addition, in the circuits shown in fig. 6 and 7, the chip used in the keyboard-mouse signal analog circuit supports serial bidirectional communication, but in order to unidirectionally transmit the keyboard-mouse signal, the transmitting line in the serial communication line is suspended, that is, the signal transmitting end in the keyboard-mouse signal analog circuit is suspended.
The remote control system provided by the embodiment of the invention comprises a transfer server, a back-end host and the remote control equipment provided by the embodiment of the invention.
From the above description of embodiments, it will be apparent to those skilled in the art that embodiments of the present invention may be implemented in hardware plus necessary software. Based on such understanding, the technical solution of the embodiments of the present invention may be embodied in the form of a software product, where the software product may be stored in a non-volatile storage medium (may be a CD-ROM, a U-disk, a mobile hard disk, etc.), and includes several instructions for causing a computer device (may be a personal computer, a server, or a network device, etc.) to perform the method described in the embodiments of the present invention.
Those skilled in the art will appreciate that the drawing is merely a schematic representation of one preferred embodiment and that the modules or processes in the drawing are not necessarily required to practice the invention.
Those skilled in the art will appreciate that modules in an apparatus of an embodiment may be distributed in an apparatus of an embodiment as described in the embodiments, and that corresponding changes may be made in one or more apparatuses different from the present embodiment. The modules of the above embodiments may be combined into one module, or may be further split into a plurality of sub-modules.
The foregoing embodiment numbers of the present invention are merely for the purpose of description, and do not represent the advantages or disadvantages of the embodiments. It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (10)
1. The remote control equipment is characterized by comprising a keyboard mouse simulator, a video signal collector and a transfer host;
the keyboard mouse simulator is used for converting a keyboard mouse signal received from the transferring host into a serial signal, decoding and converting the serial signal into a keyboard control signal and a mouse control signal, and sending the keyboard mouse control signal and the mouse control signal to the target host; the keyboard and mouse signals received by the transit host are keyboard and mouse signals sent by emergency disposal personnel on the back-end host;
the video signal collector is used for collecting signals displayed by the target host and sending the collected signals to the back-end host through the transfer host;
the transfer host is used for receiving a keyboard and mouse signal sent by emergency disposal personnel on the back-end host and sending the keyboard and mouse signal to the keyboard and mouse simulator; and the video signal acquisition unit is used for acquiring the video signal and sending the video signal to the back-end host;
the keyboard mouse simulator, the video signal collector and the transit host are located on the site where the network security event occurs.
2. The apparatus of claim 1, wherein the relay host and the back-end host encrypt and forward signals through a relay server, wherein the encrypted and forwarded signals include signals collected by a keyboard mouse signal and a video signal collector.
3. The apparatus of claim 2, wherein the relay server is further configured to determine that a key of the relay host to the relay server initiated connection and a key of the backend host to the relay server initiated connection are the same prior to encrypting and forwarding the signal.
4. The device of claim 1, wherein the keyboard mouse simulator comprises a first signal plug, a first conversion circuit, a keyboard mouse signal simulation circuit, a second signal plug;
the first conversion circuit is used for converting a keyboard mouse signal received from the transfer host through the first signal plug into a serial signal;
the keyboard mouse signal analog circuit is used for receiving serial signals through a signal receiving end of the keyboard mouse signal analog circuit, decoding and converting the serial signals into keyboard control signals and mouse control signals, and sending the keyboard control signals and the mouse control signals to a target host through the second signal plug; and a signal transmitting end of the keyboard mouse signal simulation circuit is suspended.
5. The apparatus of claim 4, wherein the keyboard mouse simulator further comprises an isolation circuit;
the isolation circuit is used for receiving the serial signal from the first conversion circuit and transmitting the received serial signal to the keyboard mouse signal simulation circuit in a coupling mode so as to prevent the interference signal of the target host side from being reversely transmitted to the transfer host.
6. The apparatus of claim 5, wherein the isolation circuit is an electromagnetic isolation circuit, an input of the electromagnetic isolation circuit receives a serial signal from the first conversion circuit, and an output of the electromagnetic isolation circuit is connected to a signal receiving end of the keyboard mouse signal analog circuit; wherein, the ground signal of the input side of the electromagnetic isolation circuit is different from the ground signal of the output side of the electromagnetic isolation circuit.
7. The apparatus of claim 5, wherein the isolation circuit is an optocoupler isolation circuit having an input receiving a serial signal from the first conversion circuit and an output connected to a signal receiving end of the keyboard mouse signal analog circuit.
8. The device of claim 4, wherein the keyboard mouse simulator further comprises a logging circuit;
the log recording circuit is used for recording the keyboard control signals output by the keyboard mouse signal simulation circuit.
9. The apparatus of claim 8, wherein the logging circuit comprises a level shifter circuit, a secure digital card reader, and a secure digital card.
10. A remote control system comprising a transit server, a back-end host, and the remote control device of any of claims 1-9.
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| CN201811651403.7A CN110794971B (en) | 2018-12-31 | 2018-12-31 | Remote control equipment and system |
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| CN201811651403.7A CN110794971B (en) | 2018-12-31 | 2018-12-31 | Remote control equipment and system |
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| CN110794971B true CN110794971B (en) | 2023-06-02 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111475867A (en) * | 2020-04-03 | 2020-07-31 | 刘小明 | General safety cooperation system |
| CN112462961A (en) * | 2020-12-04 | 2021-03-09 | 深圳市创维群欣安防科技股份有限公司 | Network forwarding keyboard mouse code processing method, device and system |
| CN113190489B (en) * | 2021-05-19 | 2022-04-08 | 郑州信大捷安信息技术股份有限公司 | Double-host event sharing switching device and method |
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