Even if all of your hubs are powered, though, there are still limitations that you must be aware of. First, the five-hub limit still applies whether the hubs are powered or not. The other limit is that you must still avoid overburdening any one hub with USB devices with excessive power consumption. Finally, external power sources do nothing to provide extra bandwidth. If you were to interconnect five hubs with four devices each, you could connect 20 USB devices to a single USB port, as long as none of the devices had excessive power consumption. At the same time, though, these 20 devices would have to share the 12 Mbps of available bandwidth.
If the USB 2.0 five-meter limit is not long enough for your needs, you can purchase one or more USB hubs or special cables. There are two types of hubs: powered and unpowered. Higher power draw devices may require a powered hub.
techrepublic usb 3.0 powered hub
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I obtained an el-cheapo USB-C charging cable (aka NON e-marked cable) from Amazon. I tried this cable with my Macbook Pro 87W USB-C Power Adapter. This combination successfully powered the RPi 4B. I also tried this same cable with Apple's 18 watt iPhone charger. This combination also successfully powered the RPi 4B, and has continued to do so for more than 24 hours as of this writing. 2ff7e9595c
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