TWI464587B - Interface card - Google Patents

Description

Interface card

The present invention relates to an interface card, and more particularly to an interface card having a host-side connector function of a KVM signal extender system.

Please refer to FIG. 1 , which illustrates a schematic diagram of a conventional computer management system. The computer management system 100 includes a signal extender system 110 and a host 120. The signal extender system 110 includes a remote module 130 and a host-side dongle 140. The remote module 130 is, for example, a KVM switch or a remote-end module. The remote module 130 outputs a keyboard/mouse signal to the host connector via a network route. 140. The host connector 140 outputs the keyboard/mouse signal to the host 120, or receives a video signal from the host 120 and outputs the video signal to the remote module 130 via the network route.

Please refer to FIG. 2, which shows a schematic diagram of a conventional host connector. The host connector 140 includes a connector body 142, a keyboard/mouse interface 144, and a video interface 146. The connector body 142 includes a network interface 148 that is coupled to the remote module 130 via a network route. The keyboard/mouse interface 144 and the video interface 146 are respectively connected to the keyboard/mouse interface and the video interface of the host 120, and the keyboard/mouse interface 144 outputs the keyboard/mouse signal to the keyboard/mouse interface of the host 120, and the video interface 146. The video signal is received from the video interface of the host 120. Since the host end connector 140 is mounted outside the host 120, the mechanism of the host end connector 140 The outer casing substantially occupies a certain space, which is not conducive to simplifying the installation rack environment of the computer management system 100. In addition, when the interface corresponding to the keyboard/mouse interface 144 is different, for example, a personal system (PS/2) interface, a universal serial bus (USB) interface, or a sun (SUN) interface. Therefore, it is inconvenient to replace the host-side connector 140 of the corresponding model to correspond to the host of different connection interface specifications.

In addition, the remote module 130 can cause the host 120 to perform a cold boot or a power reset via the host connector 140. However, because the host-side connector 140 obtains power supply from the host 120 via the keyboard/mouse interface 144, the host-side connector 140 cannot obtain power from the keyboard/mouse interface 144 of the host 120 when the host 120 is in the off state. The supply causes the remote module 130 to fail to cause the host 120 to perform a cold boot or a power reset, resulting in inconvenience.

The invention relates to an interface card, which modularizes and inserts a connector of a signal extender system to integrate and simplify the installation environment of the whole system, and is inserted into the host to be in the host The state of the switch can remotely control the host for cold boot or power reset.

According to a first aspect of the present invention, an interface card is provided, comprising a connector, a keyboard/video/mouse interface, a processing unit, a first conversion unit, a second conversion unit, and a network interface. The connector is plugged into one of the slots of a host to obtain power from the host. Keyboard/video/mouse The port has at least 18 pins, and is electrically connected to a keyboard/mouse interface and a video interface of the host through a cable to receive a single-ended video signal from the video interface of the host, and output a keyboard/mouse signal. To the keyboard/mouse interface of the host. The processing unit processes a digital control signal to output a keyboard/mouse signal to the keyboard/video/mouse interface. The first conversion unit converts the single-ended video signal from the keyboard/video/mouse interface and outputs a differential video signal accordingly. The second conversion unit converts a differential control signal and outputs a digital control signal to the processing unit. The network interface outputs the differential video signal from the first conversion unit to a KVM switch or a remote control module via a network route, and receives the switch from the KVM switch or the remote control module via the network route. Differentially controlling the signal and outputting the differential control signal to the second conversion unit.

According to a second aspect of the present invention, an interface card is provided, including a connector, a universal serial bus interface, a digital analog converter, a first processing unit, a second processing unit, and a first conversion unit. A second conversion unit, a network interface, and a video image array output. The connector is plugged into one of the slots of a host to obtain power supply from the host and receive a single-ended video signal. The universal serial bus interface is electrically connected to one of the keyboard/mouse interfaces of the host to output a keyboard/mouse signal to the keyboard/mouse interface of the host. The digital analog converter converts the single-ended video signal from the connector and outputs an analog video signal accordingly. The first processing unit processes the digital mixed signal to output a digital control signal. The second processing unit processes the digital control signal to output a keyboard/mouse signal to the universal serial bus interface. The first conversion unit will come from the number The bit analog converter converts the analog video signal and the horizontal/vertical sync signal to output a differential video signal. The second converting unit converts a differential control signal and outputs a digital mixed signal to the first processing unit. The network interface outputs the differential video signal from the first conversion unit to a KVM switch or a remote control module via a network route, and receives the switch from the KVM switch or the remote control module via the network route. Differentially controlling the signal and outputting the differential control signal to the second conversion unit. The video image array output outputs analog video signals and horizontal/vertical sync signals from the digital analog converter to a display.

According to a third aspect of the present invention, an interface card is provided, including a connector, a universal serial bus hub, a digital analog converter, a first processing unit, a second processing unit, a first conversion unit, A second conversion unit, a network interface, and a video image array output. The connector is plugged into one of the slots of a host to obtain power supply from the host and receive a single-ended video signal, and outputs a keyboard/mouse signal to the host. The universal serial bus hub receives and outputs the keyboard/mouse signal to the connector. The digital analog converter converts the single-ended video signal from the connector and outputs an analog video signal accordingly. The first processing unit processes the digital mixed signal to output a digital control signal. The second processing unit processes the digital control signal to output a keyboard/mouse signal to the universal serial bus hub. The first converting unit converts the analog video signal and the horizontal/vertical sync signal from the digital analog converter and outputs a differential video signal accordingly. The second converting unit converts a differential control signal and outputs a digital mixed signal to the first processing unit. network The interface outputs the differential video signal from the first conversion unit to a KVM switch or a remote control module via a network route, and receives the differential from the KVM switch or the remote control module via the network route. Controlling the signal and outputting the differential control signal to the second conversion unit. The video image array output outputs analog video signals and horizontal/vertical sync signals from the digital analog converter to a display.

In order to make the above-mentioned contents of the present invention more comprehensible, a preferred embodiment will be described below, and in conjunction with the drawings, a detailed description is as follows:

The invention provides an interface card for modularizing and plugging a connector of a signal extender system and plugging it into a host to integrate and simplify the installation environment of the overall system. In addition, with the standby power supply inside the host, it is possible to perform cold boot or power reset or sequence control by the remote control host when the host is powered on or off.

First embodiment

Please refer to FIG. 3, which is a schematic diagram of an interface card according to a first embodiment of the present invention. The interface card 300 includes a connector 310, a keyboard/video/mouse interface 320, a processing unit 330, a first conversion unit 340, a second conversion unit 350, a network interface 360, and a power reset unit 370. A sequence of interfaces 380 and a third conversion unit 390. The connector 310 is, for example, a gold finger that is plugged into one of the slots of a host (not shown). The host includes a motherboard, and the slot is located on the motherboard. this The slot is, for example, a Peripheral Component Interface (PCI) slot, a Fast Peripheral Component Interface (PCI Express) slot, or an Accelerated Graphics Port (AGP) slot. limit. The interface card 300 is supplied with power from the host via the connector 310.

The keyboard/video/mouse interface 320 is, for example, an SPHD 18 (Special High Density 18) interface having at least 18 pins, so that the keyboard/video/mouse interface 320 can correspond to different interfaces and receive Different interface signals achieve the goal of integrating multiple interfaces. The keyboard/video/mouse interface 320 is electrically connected to a keyboard/mouse interface and a video interface through a cable. The keyboard/mouse interface and the video interface of the host are also substantially located on the motherboard. Further, the cable is, for example, a 3-in-1 (triple) cable or a 2-in-1 (two-way) cable. The host outputs a single-ended video signal to the keyboard/video/mouse interface 320 of the interface card 300 via its own video interface.

The first conversion unit 340 converts the single-ended video signal from the keyboard/video/mouse interface 320 and outputs a differential video signal to the network interface 360. The network interface 360 outputs the differential video signal from the first conversion unit 340 to a KVM switch or a remote-end module via a network route (not shown). ). The network route is, for example, an unshielded twisted pair (UTP) cable, and includes a CAT5/5e/6/7 cable, and is not limited thereto, and can be used to transmit a relatively far-end signal. The network interface 360 is, for example, an RJ-45 interface. The first conversion unit 340 is, for example, a differential power Circuit op amp.

In this embodiment, the single-ended video signal output by the host includes a red video signal (R), a green video signal (G), a blue video signal (B), a vertical synchronization signal (V), a horizontal synchronization signal (H), and Line length detection signal (8MHz). After being converted and processed by the first conversion unit, the red video signal (R), the green video signal (G) and the blue video signal (B) are synchronously synchronized with the vertical sync signal (V) and horizontally in a one-to-one combination compression manner. The signal (H) and the line length detection signal (8 MHz) form three sets of differential video signals, such as R+V, G+8 MHz, and B+H, but the technique of this embodiment is not limited thereto. The single-ended video signal includes a luminance video signal (Y), a chrominance video signal (U), a component video signal (Vc), a vertical sync signal (V), a horizontal sync signal (H), and a line length detection signal (8 MHz). ). After being converted and processed by the first conversion unit, the luminance video signal (Y), the chrominance video signal (U), and the color difference video signal (Vc) are synchronously synchronized with the vertical synchronization signal (V) and horizontally in a one-to-one combination compression manner. The signal (H) and the line length detection signal (8 MHz) form three sets of differential video signals.

In addition, the network interface 360 receives the differential control signal from the KVM switch or the remote control module via the network route, and outputs the differential control signal to the second conversion unit 350. The second conversion unit 350 is, for example, an RS485 transceiver, an RS422 transceiver, or an RS232 transceiver. The second converting unit 350 converts the differential control signal and outputs a digital control signal to the processing unit 330 accordingly. The processing unit 330 processes the digital control signal to output a keyboard/mouse signal to the keyboard/video/mouse interface 320. Keyboard/Video/Mouse Interface 320 for this keyboard/mouse The signal is output to the keyboard/mouse interface on the motherboard.

In addition, the power reset unit 370 is electrically connected to the processing unit 330 and the host. The network interface 360 receives the differential power control signal from the KVM switch or the remote control module via the network route, and outputs the differential power control signal to the second conversion unit 350. The second converting unit 350 converts the differential power control signal and outputs a single-ended power control signal to the processing unit 330. The processing unit 330 controls the power reset unit 370 according to the single-ended power control signal, and the power reset unit 370 causes the host to perform a cold boot or a power reset via the connector 310.

In addition, the serial port interface 380 is electrically connected to the host serial port interface of the host through another cable. The serial port interface 380 is used to transmit signals of a terminal device (for example, a telephone). The third conversion unit 390 is electrically connected to the processing unit 330 and the serial port interface 380. The network interface 360 receives the differential power control signal from the KVM switch or the remote control module via the network route, and outputs the differential power control signal to the second conversion unit 350. The second converting unit 350 converts the differential power control signal and outputs a first sequence power control signal to the processing unit 330.

The processing unit 330 converts the first sequence power control signal and outputs a second sequence power control signal to the third conversion unit 390. The third converting unit 390 converts the second sequence power control signal and outputs a third sequence power control signal to the serial port 380. The serial port interface 380 transmits the third sequence power control signal to the host serial port interface of the host, so that the host performs cold boot, power reset or a sequence control. Wherein, the first, second and third sequence power control signals are not at the level with. The third conversion unit 390 is, for example, an RS485 transceiver, an RS422 transceiver, or an RS232 transceiver.

Since the interface card 300 is plugged into the slot on the motherboard via the connector 310, and the standby power supply on the motherboard is about 3.3 volts, the interface card 300 can be used even when the host is powered off. Power supply is obtained via the connector 310. In this way, when the host is powered off, the KVM switch or the remote control module can still control the host to perform a cold boot or a power reset without worrying about the power supply problem that the host is not powered on.

Second embodiment

Please refer to FIG. 4, which is a schematic diagram of an interface card according to a second embodiment of the present invention. The interface card 400 includes a connector 410, a universal serial bus (USB) interface 420, a digital analog converter 430, a first processing unit 440, a second processing unit 450, and a first conversion. The unit 460, a second conversion unit 470, a network interface 480, and a Video Graphics Array (VGA) output 490. The connector 410 is, for example, a gold finger that is plugged into one of the slots of a host (not shown). The host includes a motherboard, and the slot is located on the motherboard. The slot is, for example, a peripheral component interface (PCI) slot, a fast peripheral component interface (PCIE) slot, or an accelerated image processing port (AGP) slot, and is not limited. The interface card 400 receives power from the host via the connector 410 and receives a single-ended video signal from the host.

The digital analog converter 430 converts the single-ended video signal from the connector 410 and outputs an analog video signal accordingly. First conversion unit The 460 converts the analog video signal and the horizontal/vertical sync signal from the digital analog converter 430 and outputs a differential video signal to the network interface 480. The network interface 480 outputs the differential video signal from the first conversion unit 460 to a KVM switch or a remote control module via a network route (not shown). The network route is, for example, an unshielded twisted pair (UTP) cable, and includes a CAT5/5e/6/7 cable, and is not limited thereto, and can be used to transmit a relatively far-end signal. In addition, the video image array output 490 outputs the analog video signal and the horizontal/vertical sync signal from the digital analog converter 430 to a display. The first conversion unit 460 is, for example, a differential circuit operational amplifier.

In this embodiment, the analog video signal includes a red video signal (R), a green video signal (G), a blue video signal (B), a vertical sync signal (V), a horizontal sync signal (H), and a line length detection. Signal (8MHz). After being converted and processed by the first conversion unit, the red video signal (R), the green video signal (G) and the blue video signal (B) are synchronously synchronized with the vertical sync signal (V) and horizontally in a one-to-one combination compression manner. The signal (H) and the line length detection signal (8 MHz) form three sets of differential video signals, such as R+V, G+8 MHz, and B+H, but the technique of this embodiment is not limited thereto. The above analog video signals include luminance video signal (Y), chroma video signal (U), component video signal (Vc), vertical sync signal (V), horizontal sync signal (H), and line length detection signal (8 MHz). . After being converted and processed by the first conversion unit, the luminance video signal (Y), the chrominance video signal (U), and the color difference video signal (Vc) are synchronously synchronized with the vertical synchronization signal (V) and horizontally in a one-to-one combination compression manner. The signal (H) and the line length detection signal (8 MHz) form three sets of differential video signals.

In addition, the network interface 480 receives a differential control signal from the KVM switch or the remote control module via the network route, and outputs the differential control signal to the second conversion unit 470. Network interface 480 is, for example, an RJ-45 interface. The second converting unit 470 converts the differential control signal and outputs a digital mixed signal to the first processing unit 440. The first processing unit 440 is, for example, an Application Specific Integrated Circuit (ASIC), a Complex Programmable Logic Device (CPLD), or a Field Programmable Gates (Field Programmable Gates). Array (FPGA), which processes the digital mixed signal from the second conversion unit 470 to output a digital control signal. The second processing unit 450 is, for example, a microprocessor control unit (MCU) that processes the digital control signals from the first processing unit 440 to output a keyboard/mouse signal to the universal serial bus interface 420. . The universal serial bus interface 420 is electrically connected to a keyboard/mouse interface of the host through a cable to output a keyboard/mouse signal to the keyboard/mouse interface of the host.

In addition, the first processing unit 440 is further configured to store the polarity of the horizontal/vertical synchronization signal and transmit the signal to the KVM switch or the remote control module via the network interface 480. In this way, the KVM switch or the remote control module can correctly restore the differential synchronization signal according to the polarity of the horizontal/vertical synchronization signal transmitted, so that the output of the differential video signal is more accurate and undistorted. In addition, the second processing unit 450 can also be used to store the polarity of the horizontal/vertical synchronization signal. Moreover, the first processing unit 440 can also receive and store the polarity of the horizontal/vertical synchronization signal without The polarity of the horizontal/vertical sync signal is received by the digital analog converter 430.

In addition, the network interface 480 further receives a differential power control signal from the KVM switch or the remote control module via the network route, and outputs the differential power control signal to the second conversion unit 470. The second converting unit 470 converts the differential power control signal and outputs a single-ended power control signal to the first processing unit 440. The first processing unit 440 outputs the single-ended power control signal to the second processing unit 450. The second processing unit 450 causes the host to perform a cold boot or a power reset via the connector 410 according to the single-ended power control signal.

Since the interface card 400 is inserted into the slot on the motherboard via the connector 410, and the standby power supply on the motherboard is about 3.3 volts, the interface card 400 can be used even when the host is in the off state. The power supply is obtained via the connector 410. In this embodiment, the interface card 400 may also include a third conversion unit and a serial port interface as shown in FIG. 3, and the serial port interface is connected to the host serial port of the host through a cable. In this way, when the host is powered off, the KVM switch or the remote control module can still control the host to perform a cold boot or a power reset without worrying about the power supply problem that the host is not powered on.

In addition, since the digital analog converter 430 can convert the single-ended video signal from the connector 410 and output the analog video signal and the horizontal/vertical synchronization signal, the interface card 400 can also be regarded as a display card alone. It is used and has the versatility of one card.

Third embodiment

Please refer to FIG. 5, which is a schematic diagram of an interface card according to a third embodiment of the present invention. The interface card 500 includes a connector 410, a universal serial bus interface 420, a universal serial bus hub 525, a digital analog converter 430, a first processing unit 440, and a second processing unit 450. A first conversion unit 460, a second conversion unit 470, a network interface 480, and a video image array output 490. The universal serial bus interface 420 is essentially an optional component.

The interface card 500 is similar in structure and function to the interface card 400, except that the interface card 500 has a universal serial bus hub 525. The second processing unit 450 processes the digital control signal from the first processing unit 440 to output a keyboard/mouse signal to the universal serial bus hub 425. The universal serial bus hub 525 receives and outputs a keyboard/mouse signal to the connector 410. The connector 410 outputs the keyboard/mouse signal from the universal serial bus hub 425 to the host. Of course, the universal serial bus hub 425 can also output the keyboard/mouse signal to the universal serial bus interface 420, and the universal serial bus interface 420 outputs the received keyboard/mouse signal to the host.

In this embodiment, the universal serial bus interface 420 can also be connected to a peripheral device such as a near-end keyboard/mouse to receive the near-end control signal, and the universal serial bus hub 425 can also be connected to the universal serial bus interface. The near-end control signal received by 420 is transmitted to the connector 410, and the connector 410 outputs the received keyboard/mouse signal to the host. The universal serial bus interface 420 and the universal serial bus hub 425 may also be omitted.

Since the interface card 500 is plugged into the motherboard via the connector 410 The slot has a standby power supply of about 3.3 volts on the motherboard, so that the interface card 500 can obtain power supply via the connector 410 even when the host is in the off state. In this embodiment, the interface card 500 may also include a third conversion unit and a serial port interface as shown in FIG. 3, and the serial port interface is connected to the host serial port of the host through a cable. In this way, when the host is powered off, the KVM switch or the remote control module can still control the host to perform a cold boot or a power reset without worrying about the power supply problem that the host is not powered on.

The interface card disclosed in the above embodiment of the present invention modularizes the connector of the signal extender system so that it can be plugged into the host and does not need an external adapter, so that not only can the integration be integrated. It also simplifies the installation environment of the entire system and meets environmental requirements. In addition, with the standby power supply on the motherboard inside the host, when the host is in the shutdown state, the remote control host can still perform cold boot or power reset without worrying about the power supply problem of the host not being turned on. Convenience in use.

In view of the above, the present invention has been disclosed in a preferred embodiment, and is not intended to limit the present invention. A person skilled in the art can make various changes and modifications without departing from the spirit and scope of the invention. Therefore, the scope of the invention is defined by the scope of the appended claims.

100‧‧‧Computer Management System

110‧‧‧Signal Extender System

120‧‧‧Host

130‧‧‧Remote module

140‧‧‧Host connector

142‧‧‧Connector body

144‧‧‧Keyboard/mouse interface

146‧‧‧Video Interface

148‧‧‧Network interface

300, 400, 500‧‧‧ interface cards

310, 410‧‧‧ connectors

320‧‧‧Keyboard/Video/Mouse Interface

330‧‧‧Processing unit

340, 460‧‧‧ first conversion unit

350, 470‧‧‧ second conversion unit

360, 480‧‧‧ network interface

370‧‧‧Power Reset Unit

380‧‧‧Sequence interface

390‧‧‧ Third conversion unit

420‧‧‧Common Serial Bus Interface

430‧‧‧Digital Analog Converter

440‧‧‧First Processing Unit

450‧‧‧Second processing unit

490‧‧‧Video image array output

525‧‧‧Universal Serial Bus Hub

Figure 1 shows a schematic diagram of a conventional computer management system.

Figure 2 is a schematic diagram showing a conventional host connector.

FIG. 3 is a schematic diagram of an interface card according to a first embodiment of the present invention.

4 is a schematic view of an interface card in accordance with a second embodiment of the present invention.

FIG. 5 is a schematic diagram of an interface card according to a third embodiment of the present invention.

300‧‧‧Interface card

310‧‧‧Connector

320‧‧‧Keyboard/Video/Mouse Interface

330‧‧‧Processing unit

340‧‧‧First conversion unit

350‧‧‧Second conversion unit

360‧‧‧Network Interface

370‧‧‧Power Reset Unit

Claims (22)

An interface card includes: a connector plugged into a slot of a host to obtain power supply from the host, wherein the interface card connects the host to a KVM switch through a network or a remote-end module (a remote-end module); a keyboard/video/mouse interface having at least 18 pins electrically connected to a keyboard/mouse interface and a video interface of the host through a cable. Receiving a single-ended video signal from the video interface of the host, and outputting a keyboard/mouse signal to the keyboard/mouse interface of the host; and processing unit for processing a digital control signal And outputting the keyboard/mouse signal to the keyboard/video/mouse interface; a first conversion unit converting the single-ended video signal from the keyboard/video/mouse interface and outputting a a differential video signal; a second conversion unit that converts a differential control signal and outputs the digital control signal to the processing unit; and a network interface that is derived from the first conversion unit via a network route The difference The video signal is output to the KVM switch or the remote-end module, and the differential control from the KVM switch or the remote control module is received via the network route. And outputting the differential control signal to the second conversion unit. The interface card of claim 1, wherein the connector is a gold finger. The interface card of claim 1, wherein the slot is located on a motherboard of the host. The interface card of claim 1, wherein the keyboard/video/mouse interface is an SPHD 18 (Special High Density 18) interface. The interface card of claim 1, wherein the network route is a CAT5/5e/6/7 cable. The interface card of claim 1, wherein the cable is a 3-in-1 (triple) cable or a 2-in-1 (two-and-two) cable. The interface card of claim 1, wherein the second conversion unit is an RS485 transceiver, an RS422 transceiver or an RS232 transceiver. The interface card of claim 1, further comprising: a power reset unit electrically connected to the processing unit and the host; wherein the network interface receives the switch from the KVM via the network route Or one of the remote control module differential power control signals, and outputs the differential power control signal to the second conversion unit, the second conversion unit converts the differential power control signal and outputs a single-ended The power control signal is sent to the processing unit, and the processing unit controls the power reset unit according to the single-ended power control signal, and the power reset unit causes the host to perform a cold boot or a power reset via the connector. The interface card of claim 1, further comprising: a serial port interface for electrically connecting to the host serial port interface of the host through another cable; a third conversion unit electrically connected to the processing unit and the serial port interface; wherein the network interface receives a differential power control signal from the KVM switch or the remote control module via the network route, And outputting the differential power control signal to the second conversion unit; the second conversion unit converts the differential power control signal and outputs a first sequence power control signal to the processing unit; the processing unit The first sequence power control signal is converted to output a second sequence power control signal to the third conversion unit; the third conversion unit converts the second sequence power control signal and outputs a third sequence power Controlling the signal to the serial port interface; the serial port interface transmits the third sequence power control signal to the host serial port interface of the host, so that the host performs cold boot, power reset or according to the third sequence power control signal A sequence of controls. The interface card of claim 9, wherein the first, second, and third sequence power control signals have different levels. The interface card of claim 9, wherein the third conversion unit is an RS485 transceiver, an RS422 transceiver or an RS232 transceiver. An interface card includes: a connector plugged into a slot of a host to obtain power supply from the host and receive a single-ended video signal, wherein the interface card connects the host to a multi-computer through a network a switch (KVM Switch) or a remote-end module (remote-end module); a universal serial bus (USB) interface electrically connected to one of the keyboard/mouse interfaces of the host to output a keyboard/mouse signal to the keyboard/mouse interface of the host; An analog converter that converts the single-ended video signal from the connector and outputs an analog video signal; a first processing unit processes the digital mixed signal to output a digital control signal; The second processing unit processes the digital control signal to output the keyboard/mouse signal to the universal serial bus interface; a first conversion unit that compares the analog video signal from the digital analog converter Converting and outputting a differential video signal; a second converting unit converting a differential control signal and outputting the digital mixed signal to the first processing unit; and a network interface via a network route Outputting the differential video signal from the first conversion unit to the KVM switch or the remote control module, and receiving, by the network route, the multi-computer cut Or the differential control signal of the remote control module, and outputting the differential control signal to the second conversion unit; and a video image array (VGA) output, which is derived from the digital analogy The analog video signal of the converter is output to a display. The interface card of claim 12, wherein the connector is a gold finger. The interface card of claim 12, wherein the interface card The slot is located on one of the hosts' main boards. The interface card of claim 12, wherein the network route is a CAT5/5e/6/7 cable. The interface card of claim 12, wherein the network interface receives a differential power control signal from the KVM switch or the remote control module via the network route, and outputs the differential power supply Controlling the signal to the second conversion unit, the second conversion unit converting the differential power control signal and outputting a single-ended power control signal to the first processing unit, the first processing unit The control signal is output to the second processing unit, and the second processing unit causes the host to perform a cold boot or a power reset via the connector according to the single-ended power control signal. An interface card includes: a connector plugged into a slot of a host to obtain power supply from the host and receive a single-ended video signal, and output a keyboard/mouse signal to the host, wherein the interface card Connecting the host to a KVM Switch or a remote-end module through a network; a universal serial bus hub receives and outputs the keyboard/mouse signal to the a digital analog converter that converts the single-ended video signal from the connector and outputs an analog video signal; a first processing unit processes the digital mixed signal to output a a digital control signal; a second processing unit that processes the digital control signal Outputting the keyboard/mouse signal to the universal serial bus hub; a first converting unit converting the analog video signal from the digital analog converter and outputting a differential video signal; The conversion unit converts a differential control signal and outputs the digital mixed signal to the first processing unit; and a network interface outputs the differential video signal from the first conversion unit via a network route Receiving the differential control signal from the KVM switch or the remote control module via the network route, and outputting the differential control signal to the second a conversion unit; and a video image array output for outputting the analog video signal from the digital analog converter to a display. The interface card of claim 17, wherein the connector is a gold finger. The interface card of claim 17, wherein the slot is located on a motherboard of the host. The interface card of claim 17, wherein the network route is a CAT5/5e/6/7 cable. The interface card of claim 17, wherein the network interface receives a differential power control signal from the KVM switch or the remote control module via the network route, and outputs the differential power supply. Controlling the signal to the second conversion unit, the second conversion unit converting the differential power control signal and outputting a single-ended power control signal to the first processing unit, the first processing unit Control signal loss And outputting to the second processing unit, the second processing unit causes the host to perform a cold boot or a power reset via the connector according to the single-ended power control signal. The interface card of claim 17, further comprising a serial port interface or a universal serial bus interface, electrically connected to one of the host keyboard/mouse interfaces to connect from the universal serial bus The hub receives the keyboard/mouse signal and outputs the keyboard/mouse signal to the host.