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With this supplementary specification, portable USB 3.0 mobile devices such as mobile phones and cameras can be directly connected through an interface, and it can be either a USB Host host or a USB Peripheral peripheral, in other words, a master-slave mode. This specification is especially useful for devices that require fast synchronization and large-capacity data streaming.
The USB OTG 3.0 and Embedded Host Supplement also include the power-saving features provided in USB OTG 2.0, while maintaining backward compatibility, which means that USB 3.0/2.0 devices can also communicate directly with each other.
The USB 3.0 Promotion Group has transferred the management of this supplemental specification to the official USB-IF organization and incorporated as part of the USB 3.0 specification.
The USB 3.0 Promotion Group announced the USB 3.0 standard additional standard "USB On-The-Go 3.0 and Embedded Host", which allows direct communication between portable devices that support the USB 3.0 interface without using a PC. The host plays an intermediary role.