Since there are many different types of USB interface standards for transmission rates and power consumption, each type of USB cable has its transmission distance limitations. Knowing these limitations, you can avoid unnecessary purchase of extension cables and use the USB cable itself as effectively as possible. Effective transmission distance.
In the table below, you can see the recommended cable lengths for maximum speed and available power for each type of USB cable. These are the recommended lengths without using any USB extension cables or powered USB cables.
It can be seen that as the transmission rate increases, such as the transmission rate supported by USB3.x and USB4, USB communication becomes more susceptible to interference as the wire length increases. The most "vulnerable" is the fastest USB4 interface, with a maximum effective transmission distance of only 0.8m at a rate of up to 40Gbps.
If the cable is longer than the recommended length, the USB device will normally lose signal strength or quality. Improper lengthening will result in packet loss, which will result in slower speeds. Therefore, buying a USB extension cable is not as long as possible. The length is sufficient to obtain the best signal and transmission speed effect.
USB cables were originally made for short distance transfers between computers and other devices. But now, USB cables have more uses, so the effect of cable length limitations is more pronounced.
USB cables are copper wires, so like network cables and wires, the farther you go, the more you lose signal strength. This signal loss (attenuation) is measured in decibels of the signal per distance, and the greater the distance, the greater the signal loss. The more loss, the greater the chance that the receiver will not be able to detect the signal or read it correctly.
A stupid solution is that signal attenuation can be reduced by using thicker wires in the USB cable, after all, the thicker the wire diameter, the lower the signal loss.
Signal attenuation can also be reduced by using better insulation and anti-interference methods in the line, such as adding a magnetic ring.
