Hot plug system for switch

Abstract

The utility model relates to the technical field of hot plug, and provides a hot plug system for a switch, which comprises a pluggable module, a hot plug connector, a first RC filter circuit, a second RC filter circuit and a third RC filter circuit, the lengths of a power supply pin of the pluggable module and a ground signal pin of the pluggable module are both the length of the first pin, and the lengths of an in-place signal pin of the pluggable module and a control signal pin of the pluggable module are both the length of the second pin; when the pluggable module is inserted into the hot plug connector, the power supply pin of the pluggable module is connected with the first power supply pin of the hot plug connector, the in-place signal pin of the pluggable module is connected with the in-place signal pin of the hot plug connector, and the control signal pin of the pluggable module is connected with the control signal pin of the pluggable module. The ground signal pin of the pluggable module is connected with the first ground signal pin of the pluggable module. The circuit complexity and the cost of the hot plug system for the switch can be reduced.

Description

Technical Field

[0001] This application relates to the technical field of hot plug technology, and particularly relates to a hot plug system for a switch. Background Art

[0002] Hot plugging means plugging and unplugging while the system power is on. It refers to inserting or removing pluggable modules such as modules and boards into or out of the system without shutting down the system power, without affecting the normal operation of the system, thereby improving the reliability, quick maintainability, redundancy, and timely disaster recovery ability of the system, etc. In a switch system, usually some circuit modules need to support hot plugging, such as pluggable modules like fan modules and power modules. Currently, the existing method is to use a hot plug chip + MOS transistor to achieve this, but this implementation method makes the hot plug system have problems of complex circuit and high cost. Content of the Utility Model

[0003] This application provides a hot plug system for a switch, which can solve the problems of complex circuit and high cost.

[0004] This application provides a hot plug system for a switch, including a pluggable module, a hot plug connector, a first RC filter circuit, a second RC filter circuit, and a third RC filter circuit;

[0005] The first end of the first RC filter circuit is connected to the first signal pin of the hot plug connector, the second end of the first RC filter circuit is connected to the presence signal pin of the switch, the ground terminals of the first RC filter circuit, the second RC filter circuit, the third RC filter circuit, the second ground signal pin of the hot plug connector, and the ground signal pin of the switch are all grounded. The first end of the second RC filter circuit is connected to the second signal pin of the hot plug connector, the second end of the second RC filter circuit is connected to the first control signal pin of the switch, the first end of the third RC filter circuit is connected to the third signal pin of the hot plug connector, the second end of the third RC filter circuit is connected to the second control signal pin of the switch, and the second power pin of the hot plug connector is connected to the power pin of the switch;

[0006] The lengths of the power pin and the ground signal pin of the pluggable module are both the first pin length, and the lengths of the presence signal pin and the control signal pin of the pluggable module are both the second pin length; the first pin length is greater than the second pin length;

[0007] When the pluggable module is inserted into the hot-swap connector, the power pins of the pluggable module are connected to the first power pins of the hot-swap connector, the presence signal pins of the pluggable module are connected to the presence signal pins of the hot-swap connector, the control signal pins of the pluggable module are connected to the control signal pins of the pluggable module, and the ground signal pins of the pluggable module are connected to the first ground signal pins of the pluggable module; the connection time of the power pins and the ground signal pins of the pluggable module to the hot-swap connector is earlier than the connection time of the presence signal pins and the control signal pins of the pluggable module to the hot-swap connector.

[0008] Optionally, the first RC filter circuit includes a first resistor and a first capacitor;

[0009] The first end of the first resistor is the first end of the first RC filter circuit, the second end of the first resistor and the first end of the first capacitor are both the second end of the first RC filter circuit, and the second end of the first capacitor is the grounding end of the first RC filter circuit.

[0010] Optionally, the second RC filter circuit includes a second resistor and a second capacitor;

[0011] The first end of the second resistor is the first end of the second RC filter circuit, the second end of the second resistor and the first end of the second capacitor are both the second end of the second RC filter circuit, and the second end of the second capacitor is the grounding end of the second RC filter circuit.

[0012] Optionally, the third RC filter circuit includes a third resistor and a third capacitor;

[0013] The first end of the third resistor is the first end of the third RC filter circuit, the second end of the third resistor and the first end of the third capacitor are both the second end of the third RC filter circuit, and the second end of the third capacitor is the grounding end of the third RC filter circuit.

[0014] Optionally, the control signal pins of the hot-swap connector include a first control signal pin and a second control signal pin;

[0015] The control signal pins of the pluggable module include a first pluggable signal pin and a second pluggable signal pin.

[0016] Optionally, when the pluggable module is inserted into the hot-swap connector, the first pluggable signal pin is connected to the first control signal pin, and the second pluggable signal pin is connected to the second control signal pin.

[0017] The above solution of this application has the following beneficial effects:

[0018] In the embodiments of the present application, by connecting the first signal pin of the hot pluggable connector to the first RC filter circuit, the second signal pin to the second RC filter circuit, and the third signal pin to the third RC filter circuit, the first RC filter circuit, the second RC filter circuit, and the third RC filter circuit play the role of limiting current and absorbing high-frequency noise, and can absorb and limit the surge voltage generated during insertion to a certain extent, avoiding the situation of damaging the chip in the switch due to the instantaneous voltage pulse generated by the voltage difference during insertion. Moreover, the topological structure of the RC filter circuit is simple, which reduces the cost of the circuit. The lengths of the power supply pin and the ground signal pin in the pluggable module are both the length of the first pin, and the lengths of the presence signal pin and the control signal pin are both the length of the second pin. When the pluggable module is connected to the hot pluggable connector, the power supply pin and the ground signal pin contact the hot pluggable connector first, and after the voltage of the pluggable module is the same as that of the hot pluggable connector, the presence signal pin and the signal pin are then made to contact the hot pluggable connector, effectively avoiding the generation of an overly high voltage pulse caused by unstable connection during hot plugging, which may lead to the chip latch-up effect. And by simply designing the lengths of the pins, the circuit complexity and cost of the hot pluggable system for the switch are further reduced.

[0019] Other beneficial effects of the present application will be described in detail in the subsequent specific implementation part. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0021] Figure 1 Schematic diagram of the hot pluggable system for the switch provided by the present application;

[0022] Figure 2 Schematic diagram of the topological structure of the pluggable module provided by the present application;

[0023] Figure 3 Schematic diagram of the topological structure of the hot pluggable connector provided by the present application;

[0024] Figure 4 Schematic diagram of the topological structure of the current limiting circuit of the switch provided by the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] In the following description, for purposes of illustration and not limitation, specific details such as particular system architectures, technologies, etc. are set forth in order to provide a thorough understanding of embodiments of the present application. However, those skilled in the art will appreciate that the present application may be practiced in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present application with unnecessary details.

[0026] It should be understood that when used in the specification and claims of the present application, the term "comprising" indicates the presence of the described features, integers, steps, operations, elements, and / or components, but does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or their groups.

[0027] It should also be understood that the term "and / or" as used in the specification and claims of the present application refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0028] In addition, in the description of the specification and claims of the present application, the terms "first", "second", "third", etc. are used only for distinguishing descriptions and should not be construed as indicating or implying relative importance.

[0029] Reference to "one embodiment" or "some embodiments" or the like described in the specification of the present application means that a particular feature, structure, or characteristic described in connection with that embodiment is included in one or more embodiments of the present application. Thus, statements such as "in one embodiment", "in some embodiments", "in other some embodiments", "in still other embodiments", etc. that appear in different places in this specification are not necessarily all referring to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in another way. The terms "comprising", "including", "having", and their variants all mean "including but not limited to", unless otherwise specifically emphasized in another way.

[0030] In view of the problems of complex circuit and high cost existing in the current hot-swap system, the present application provides a hot-swap system for a switch. By connecting the first signal pin of the hot-swap connector to the first RC filter circuit, the second signal pin to the second RC filter circuit, and the third signal pin to the third RC filter circuit, the first RC filter circuit, the second RC filter circuit, and the third RC filter circuit play the role of limiting current and absorbing high-frequency noise, can play a certain role in absorbing and limiting the surge voltage generated at the moment of insertion, avoid the generation of instantaneous voltage pulses due to the voltage difference at the moment of insertion and damage the chips in the switch, and the topological structure of the RC filter circuit is simple, so that the cost of the circuit is reduced; the lengths of the power supply pin and the ground signal pin in the pluggable module are both the length of the first pin, and the lengths of the presence signal pin and the control signal pin are both the length of the second pin. When the pluggable module is connected to the hot-swap connector, the power supply pin and the ground signal pin contact the hot-swap connector first, and after the voltage of the pluggable module is the same as that of the hot-swap connector, then the presence signal pin and the signal pin contact the hot-swap connector, effectively avoiding the generation of excessive voltage pulses caused by unstable connection during the hot-swap process, which leads to the chip latch-up effect, and the simple design of the lengths of the pins further reduces the circuit complexity and cost of the hot-swap system for the switch.

[0031] The following will give an exemplary description of the hot-swap system for a switch provided by the present application with specific examples.

[0032] As Figure 1 shown, the hot-swap system for a switch provided by the embodiment of the present application includes a pluggable module, a hot-swap connector, a first RC filter circuit, a second RC filter circuit, and a third RC filter circuit.

[0033] The hot-swap connector has the following pins: a first power supply pin (such as Figure 1 A1 in Figure 1 ), a presence signal pin (such as Figure 1 A2 in Figure 1 ), a first ground signal pin (such as Figure 1 A5 in Figure 1 ), a control signal pin, a second power supply pin (such as Figure 1 A6 in Figure 1 ), a first signal pin (such as

[0034] A7 in Figure 1In B2), the ground terminals of the first RC filter circuit, the second RC filter circuit, and the third RC filter circuit, the second ground signal pin of the hot plug connector, and the ground signal pin of the switch (such as Figure 1 In B5) are all grounded. The first terminal of the second RC filter circuit is connected to the second signal pin of the hot plug connector, and the second terminal of the second RC filter circuit is connected to the first control signal pin of the switch (such as Figure 1 In B3). The first terminal of the third RC filter circuit is connected to the third signal pin of the hot plug connector, and the second terminal of the third RC filter circuit is connected to the second control signal pin of the switch (such as Figure 1 In B4). The second power pin of the hot plug connector is connected to the power pin of the switch (such as Figure 1 In B1).

[0035] The lengths of the power pin and the ground signal pin of the pluggable module are both the first pin length, and the lengths of the presence signal pin and the control signal pin of the pluggable module are both the second pin length; the first pin length is greater than the second pin length.

[0036] When the pluggable module is inserted into the hot plug connector, the power pin of the pluggable module is connected to the first power pin of the hot plug connector, the presence signal pin of the pluggable module is connected to the presence signal pin of the hot plug connector, the control signal pin of the pluggable module is connected to the control signal pin of the pluggable module, and the ground signal pin of the pluggable module is connected to the first ground signal pin of the pluggable module; the connection time of the power pin and the ground signal pin of the pluggable module to the hot plug connector is earlier than the connection time of the presence signal pin and the control signal pin of the pluggable module to the hot plug connector.

[0037] The first RC filter circuit includes a first resistor (such as Figure 1 R1 in Figure 1 and a first capacitor (such as

[0038] C1 in

[0039] The first terminal of the first resistor is the first terminal of the first RC filter circuit, the second terminal of the first resistor and the first terminal of the first capacitor are both the second terminal of the first RC filter circuit, and the second terminal of the first capacitor is the ground terminal of the first RC filter circuit. Figure 1 Figure 1 The second RC filter circuit includes a second resistor (such as R2 in

[0040] and a second capacitor (such as

[0041] The third RC filter circuit includes a third resistor (such as Figure 1 R3 in Figure 1 ) and a third capacitor (such as

[0042] C3 in

[0043] The first end of the third resistor is the first end of the third RC filter circuit, the second end of the third resistor and the first end of the third capacitor are both the second end of the third RC filter circuit, and the second end of the third capacitor is the grounding end of the third RC filter circuit. Figure 1 The control signal pins of the hot-swap connector include a first control signal pin (such as Figure 1 A3 in

[0044] The control signal pins of the pluggable module include a first pluggable signal pin and a second pluggable signal pin, and the lengths of the first pluggable signal pin and the second pluggable signal pin are both the second pin length.

[0045] When the pluggable module is inserted into the hot-swap connector, the first pluggable signal pin is connected to the first control signal pin, and the second pluggable signal pin is connected to the second control signal pin.

[0046] Exemplarily, the above pluggable module can be a fan module, a USB flash drive, etc. The hot-swap connector can be a gold finger connector, etc.

[0047] It should be noted that Figure 1 The arrow in

[0048] In some embodiments of the present application, the topological structure of the pluggable module is as shown in Figure 2 . Figure 2The pluggable module J3 includes 10 pins. Pin 1 is respectively connected to pin 2, pin 4, and the ground terminal. Pin 3 is respectively connected to pin 5 and the input power supply (12V_IN). Pin 6 is used to transmit the presence signal PRESNT#N. Pin 6 is connected to the first end of resistor R2, and the second end of resistor R2 is connected to the ground terminal. Pin 7 is used to transmit the first control signal (Control_Signal#1). Pin 8 is used to transmit the second control signal (Control_Signal#2). Pin 9 is used to transmit the third control signal (Control_Signal#3). Pin 10 is used to transmit the fourth control signal (Control_Signal#4). 0R in the figure means connecting the presence signal (PRESNT#N) to the ground terminal. When the pluggable module is inserted into the switch, the corresponding signal of the switch is connected to the ground to indicate that the module is inserted. Pins 1, 2, and 4 are the ground signal pins of the pluggable module. Pins 3 and 5 are the power supply pins of the pluggable module. Pin 6 is the presence signal pin of the pluggable module. Pins 7, 8, 9, and 10 are the control signal pins of the pluggable module. When only two control signals need to be transmitted, only two of these control signal pins are activated.

[0049] The topological structure of the hot-pluggable connector is as Figure 3 shown, Figure 3 The hot-pluggable connector J1 in it includes 10 pins. Pin 1 is respectively connected to pin 2, pin 4, and the ground terminal. Pin 3 is respectively connected to pin 5 and the output power supply (12V_OUT). Pin 6 is used to transmit the presence signal PRESNT_N. Pin 7 is used to transmit the first control signal (Control_Signal_1). Pin 8 is used to transmit the second control signal (Control_Signal_2). Pin 9 is used to transmit the third control signal (Control_Signal_3). Pin 10 is used to transmit the fourth control signal (Control_Signal_4). The corresponding relationship between the 10 pins in the figure and the Figure 1 pins of the hot-pluggable connector in it is that pins 3 and 5 correspond to the first power supply pin A1, and the second power supply signal pin A2 is directly connected to the first power supply pin A1. It is not shown in Figure 2 it. Pins 1, 2, and 4 correspond to the first ground signal pin A5 and the second ground signal pin A10. When only two ground signal pins are needed, only two of pins 1, 2, and 4 are activated. Pin 6 corresponds to the second presence pin A7, and the first presence pin A2 is directly connected to A7. Figure 2 It is not shown in

[0050] The topological structure of the current-limiting circuit of the switch is as Figure 4 shown, Figure 4The switch includes a first switching resistor R1, a second switching resistor R4, a third switching resistor R5, a fourth switching resistor R7, an inverter U2, a switching main board U1, a first switching capacitor C8, a second switching capacitor C9, a third switching capacitor C10, a fourth switching capacitor C11, a fifth switching capacitor C12, a sixth switching capacitor C13, and a seventh switching capacitor C14. The first end of the first switching resistor is respectively connected to the first input power supply VCC33 and the first end of the third switching resistor. The second end of the first switching resistor is used to transmit the PRESNT_N signal and is connected to the first end 1A of the inverter. The second end 1Y of the inverter is connected to the enable pin EN (pin 4) of the switching main board. The second end of the third switching resistor is respectively connected to the second end of the second switching resistor and the signal output pin FLG (pin 3) of the switching main board. The first end of the second switching resistor transmits FLG (FLG is a fault indication signal. When the current limiting chip detects overheating and overcurrent, it will send a low signal to inform the switching host). The input pin VIN (pin 6) of the switching main board is respectively connected to the second end of the second switching capacitor, the second end of the first switching capacitor, and the second input power supply VCC_12V. The first end of the first switching capacitor is respectively connected to the first end of the second switching capacitor and the ground terminal. The output pin VOUT (pin 1) of the switching main board is respectively connected to the first end of the third switching capacitor, the first end of the fourth switching capacitor, the first end of the fifth switching capacitor, the first end of the sixth switching capacitor, and the first end of the seventh switching capacitor. The voltage at the first end of the seventh switching capacitor is the output voltage (12V_OUT) of the switch. The second ends of the third switching capacitor, the fourth switching capacitor, the fifth switching capacitor, the sixth switching capacitor, and the seventh switching capacitor are all connected to the ground terminal. The current limiting pin ILIM (pin 2) of the switching main board is connected to the first end of the fourth switching resistor. The second end of the fourth switching resistor is respectively connected to the ground signal pin GND (pin 5) of the switching main board, the ground terminal, and the PAD pin (pin 7) of the switching main board. Among them, both the first switching resistor and the third switching resistor are 4.7K ohms, the second switching resistor is 0R, and the fourth switching resistor is 26.1K / 1% (ILIM = 23950V / (RLIM 0.977 )KΩ. It is derived from the manual calculation formula that when the resistance is 26.1K, the current limit is 1A). The current limiting pin limits the current to 1A (ILIM = 1A). The first switching capacitor, the fifth switching capacitor, the sixth switching capacitor, and the seventh switching capacitor are all 22uF. The second switching capacitor and the third switching capacitor are both 0.1uF. The fourth switching capacitor is 10uF. The model of the switching main board is JWH7103DFN. Figure 4 The pins in Figure 1 The pin correspondence between the switch in Figure 4 The 12V_OUT in Figure 1The B1 pin in it, the first end of U2 is the B2 pin, the GND pin of U1 is the B5 pin, and the B3 and B4 pins are the pins for the switch to send control signals to the hot-plug connector. Figure 3 Not shown in the figure, the output voltage (12V_OUT) corresponds to the power supply pin of the switch.

[0051] It can be understood that Figure 2 、 Figure 3 、 Figure 4 is only an example of the current-limiting circuits of the pluggable module, the hot-plug connector, and the switch. When the present application is actually applied, for the pins of the pluggable module, the hot-plug connector, and the switch, it is sufficient to meet Figure 1 the pins of the pluggable module, the hot-plug connector, and the switch in the figure.

[0052] Next, the working principle of the hot-plug system for switches in the present application will be exemplarily described in combination with the specific examples above Figure 2 、 Figure 3 、 Figure 4 .

[0053] The PRESNT signal (i.e., the presence signal) in the pluggable module is actually grounded inside the module. The PRESNT signal in the switch is default pulled up to 3.3V, high level. After being inverted by the NOT gate, it becomes low level. And the switch main board is enabled by high level, resulting in no 12V_OUT output on the switch main board. At the moment of insertion, the 12V power supply is not connected, but the ground is connected. After the pluggable module is inserted properly, the PRESNT signal in the switch will be grounded by the PRESNT signal of the pluggable module and become low level. Then, after being inverted by the NOT gate, it becomes high level. At this time, the enable pin of the switch main board is activated by the high level, the internal MOS is turned on, and the chip outputs 12V (12V_OUT). Then, the 12V power supply is supplied to the pluggable module through the hot-plug connector of the switch and the gold fingers of the pluggable module to achieve the purpose of soft start of the pluggable module. In addition, the switch main board can set the current passing through the chip through the resistor R7. When the power supply current of the pluggable module exceeds the preset current-limiting value of the chip, the switch main board will generate a FLG signal, the level becomes low, and the switch can then identify that the module has an abnormality and generate an alarm to ensure within a safe current range.

[0054] Initial stage:

[0055] When the device is in its initial state and the pluggable module is not inserted, the enable signal EN of the load switch on the switching motherboard U1 is controlled by the PRESNT signal. The PRESNT signal defaults to a high level and is converted to a low level by the inverter U2, thereby closing the enable switch of the motherboard load switch and putting the load switch in a non-operating state. The VCC_12V power supply cannot pass through the switching motherboard U1, resulting in the inability to generate and transmit the power supply signal 12V_OUT to the J1 connector, and the J1 connector is in an unpowered state.

[0056] Insertion stage:

[0057] When the pluggable module J3 is connected to the hot-swap connector J1, since the 6th pin of J3 is grounded on the module board and is a low-level signal, after good contact, the pluggable module J3 will be connected to J1. The 6th pin of J3 will be connected to the 6th pin of J1, and the low signal of the pluggable module PRENST will be transmitted to the switching motherboard PRENST signal, causing the switching motherboard PRENST signal to change from high to low.

[0058] Normal working stage:

[0059] The low-level PRENST signal of the switching motherboard is converted to a high level by the U2 inverter and given to the EN pin of U1, thereby causing U1 to change from the off state to the on state. The VCC_12V passes through U1 to output the 12V_OUT signal to J1, and J1 supplies power to the pluggable module through contact with J3, enabling the pluggable module to receive power from the switching motherboard and start normal operation and establish communication with the switching motherboard.

[0060] When the pluggable module is unplugged from the hot-swap connector, the control signal pins of the pluggable module disconnect from the hot-swap connector before the power pins and ground signal pins, so that at the moment the pluggable module is powered off, the signal transmission has already been disconnected, avoiding damage to the hot-swap system caused by voltage bounce due to the voltage difference at the moment of power-off. During the unplugging stage, the PRENST signal of the pluggable module disconnects from the switching board, and the PRENST signal returns from low to high state, indicating that the pluggable module has been unplugged.

[0061] It should be noted that when the pluggable module is inserted, since the switching motherboard is in a working state, at the moment the module is inserted, if the power, ground, and signal pins come into contact with the motherboard connector, during the connection moment, the signal pins have an unstable state due to the contact process, there is a potential difference between the devices, and the voltage will bounce, generating an instantaneous voltage pulse, which may damage the switching motherboard and cause abnormal operation. Therefore, the pins of the pluggable module are designed with different lengths and an RC filtering structure is introduced to form a double protection for the hot-swap system of the switch. Moreover, the topological structure of the RC filtering structure is simple, directly designing the lengths of the pins, reducing the circuit complexity and cost of the hot-swap system of the switch.

[0062] The above are the preferred embodiments of the present application. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present application, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present application.

Claims

1. A hot-swap system for a switch, characterized in that: It includes a pluggable module, a hot-swap connector, a first RC filter circuit, a second RC filter circuit and a third RC filter circuit; A first end of the first RC filter circuit is connected to a first signal pin of the hot-plug connector, a second end of the first RC filter circuit is connected to an in-position signal pin of the switch, a ground end of the first RC filter circuit, a ground end of the second RC filter circuit, a ground end of the third RC filter circuit, a second ground signal pin of the hot-plug connector, and a ground signal pin of the switch are all grounded, a first end of the second RC filter circuit is connected to a second signal pin of the hot-plug connector, a second end of the second RC filter circuit is connected to a first control signal pin of the switch, a first end of the third RC filter circuit is connected to a third signal pin of the hot-plug connector, a second end of the third RC filter circuit is connected to a second control signal pin of the switch, and a second power pin of the hot-plug connector is connected to a power pin of the switch; The lengths of the power pin of the pluggable module and the ground signal pin of the pluggable module are both the first pin length, and the lengths of the in-position signal pin of the pluggable module and the control signal pin of the pluggable module are both the second pin length; the first pin length is greater than the second pin length; When the pluggable module is inserted into the hot-pluggable connector, the power pin of the pluggable module is connected to the first power pin of the hot-pluggable connector, the in-position signal pin of the pluggable module is connected to the in-position signal pin of the hot-pluggable connector, the control signal pin of the pluggable module is connected to the control signal pin of the pluggable module, and the ground signal pin of the pluggable module is connected to the first ground signal pin of the pluggable module; the connection time of the power pin and the ground signal pin of the pluggable module to the hot-pluggable connector is earlier than the connection time of the in-position signal pin and the control signal pin of the pluggable module to the hot-pluggable connector.

2. The hot-swap system for a switch according to claim 1, characterized in that: The first RC filter circuit includes a first resistor and a first capacitor; The first end of the first resistor is the first end of the first RC filter circuit, the second end of the first resistor and the first end of the first capacitor are both the second ends of the first RC filter circuit, and the second end of the first capacitor is the ground end of the first RC filter circuit.

3. The hot-swap system for a switch according to claim 1, characterized in that: The second RC filter circuit includes a second resistor and a second capacitor; The first end of the second resistor is the first end of the second RC filter circuit, the second end of the second resistor and the first end of the second capacitor are both the second ends of the second RC filter circuit, and the second end of the second capacitor is the ground end of the second RC filter circuit.

4. The hot-swap system for a switch according to claim 1, characterized in that: The third RC filter circuit includes a third resistor and a third capacitor; The first end of the third resistor is the first end of the third RC filter circuit, the second end of the third resistor and the first end of the third capacitor are both the second ends of the third RC filter circuit, and the second end of the third capacitor is the ground end of the third RC filter circuit.

5. The hot-swap system for a switch according to claim 1, characterized in that: The control signal pins of the hot plug connector include a first control signal pin and a second control signal pin; The control signal pins of the pluggable module include a first pluggable signal pin and a second pluggable signal pin.

6. The hot-swap system for a switch according to claim 5, characterized in that: When the pluggable module is inserted into the hot-plug connector, the first pluggable signal pin is connected to the first control signal pin, and the second pluggable signal pin is connected to the second control signal pin.

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