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12 V and 24 V powered USB sockets, on an NCR cash register. PoweredUSB, also known as Retail USB, USB PlusPower, USB +Power, and USB Power Plus, [1] is an addition to the Universal Serial Bus standard that allows for higher-power devices to obtain power through their USB host instead of requiring an independent power supply or external AC adapter.
A four-port "long cable" "external box" USB hub A four-port "compact design" USB hub: upstream and downstream ports shown. A USB hub is a device that expands a single Universal Serial Bus (USB) port into several so that there are more ports available to connect devices to a host system, similar to a power strip. All devices connected through a ...
To allow for voltage drops, the voltage at the host port, hub port, and device are specified to be at least 4.75 V, 4.4 V, and 4.35 V respectively by USB 2.0 for low-power devices, [a] but must be at least 4.75 V at all locations for high-power [b] devices (however, high-power devices are required to operate as a low-powered device so that they ...
However, portable devices typically cannot provide enough power for hard-drive disk enclosures (a 2.5-inch (64 mm) hard drive typically requires the maximum 2.5 W in the USB specification) without a self-powered USB hub. A Windows Mobile device cannot display its file system as a mass-storage device unless the device implementer adds that ...
A port expander can be any device to which one existing or onboard port becomes two or more - for example: a KVM switch or a USB hub. Such expanders offer the advantage of allowing more devices of a particular port type to be utilized at the same time.
Typically USB-C or Thunderbolt-3 based, they incorporate a range of converters such as USB display adapters or a full external GPU (eGPU), audio chipsets, NICs, storage enclosures, modems and memory card readers, or even PCI Express card slots connected through an internal USB hub or PCI Express bridge to give the host computer access to extra ...
A USB compound device contains an embedded USB hub and one or more non-removable USB devices. [1] It may or may not have exposed downstream ports. The internal USB hub may be a physical IC that connects to other ICs, or the hub and all functions may be implemented in software on a single IC (though it is more common to integrate them as a composite device in this case).
On many notebook computers only a limited amount of power at 5 V is available, and none at all at 12 V. Devices requiring more power than is available via the Expresscard, or an additional 12 V supply as required by most 3.5" or 5.25" drives, can be driven if an additional power supply is used. [4]
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