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What is the use of a switch flow switch?
Flow control (on/off) This is a flow control switch It is only used when there is a network blockage. After the blockage occurs, if a message is sent to the other device, the other device will reduce the message sending rate. Speed&duplex is the speed of the port, which can be adjusted to 10M, 100M, or 1000M (if your switch is gigabit). Duplex is a duplex mode. Usually, these two dont need to be adjusted, just adaptive. After setting the speed, it is also necessary to set the flow control, which is to set the flow control (on/off) of the switch to on. The concept of flow control originated in network communication. The purpose of using Flow Control on PCIe bus is to ensure that PCIe devices at the sending end will never send TLPs (transaction layer packets) that PCIe devices at the receiving end cannot receive. That is to say, the sender can use the Flow Control mechanism to determine whether the receiver can receive the TLP to be sent before sending. In the PCI bus, there is no mechanism such as Flow Control, so the sender does not know the current time and the receiver can receive the corresponding TLP. Therefore, the sender can only attempt to send first, during which multiple waiting periods may be inserted (due to reasons such as the receiving device not being ready), or even resending (retrievals). PCIe Spec stipulates that each port of PCIe devices must support Flow Control mechanism. Before sending a TLP, Flow Control must first check whether the receiving port has sufficient buffer space to receive the TLP. When PCIe devices support multiple Virtual Channels (VCs), the Flow Control mechanism can significantly improve the transmission efficiency of the bus. 
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2. The English word for "switch"
Switches have various expressions in English, depending on their application scenarios.
. The most basic expression is "switch", which can refer to an electrical switch, button, or switching device. For example, "electric switch" can be directly translated as "electric switch" or "electrical switch". In addition, there is an "on-off" switch, which refers to the state switching between "on" and "off", commonly used to describe the control of household appliances or mechanical equipment. In specific technical fields, switches also have more specialized terminology. For example, "main switch" or "power switch" can be translated as "main switch" or "power switch". And "on-off valve" or "switching tube" corresponds to "switching valve" or "switching tube". For situations where accurate flow control is required, "flow switches" or "on-off valves" can be used, which can be translated as "flow switches" or "valves". In cars or airplanes, in order to adjust the intensity of light, a "dimmer switch" is usually used, which is translated as "dim switch" or "dimmer control" in English. If it is necessary to disconnect the circuit, a "blocking switch" or "circuit breaker" can be used, which can be translated as "disconnecting switch" or "circuit breaker". In addition, there are some special types of switches. For example, the "foot switch" can be used for operating mechanical equipment, which is translated as "footswitch" in English. And "line selection switch" is a technology that controls equipment by selecting specific lines, corresponding to the English word "linear selection switch". In some mechanical devices, in order to achieve foot pedal control function, a "pedal switch" is use
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