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All USB hubs can operate at this rate. High speed (HS) rate of 480 Mbit/s was introduced in 2001 by USB 2.0. High-speed devices must also be capable of falling-back to full-speed as well, making high-speed devices backward compatible with USB 1.1 hosts. Connectors are identical for USB 2.0 and USB 1.x.
High-speed devices should fall back to full-speed (USB 1.1) when plugged into a full-speed hub (or connected to an older full-speed computer port). While high-speed hubs can communicate at all device speeds, low- and full-speed traffic is combined and segregated from high-speed traffic through a transaction translator. Each transaction ...
High-speed USB 2.0 hubs contain devices called transaction translators that convert between high-speed USB 2.0 buses and full and low speed buses. There may be one translator per hub or per port. Because there are two separate controllers in each USB 3.0 host, USB 3.0 devices transmit and receive at USB 3.0 signaling rates regardless of USB 2.0 ...
When a high-speed USB device is attached to any of the 4 connectors, the device is managed through one of the 4 root hub ports of the EHCI controller. If a low-speed or full-speed USB device is attached to connectors 1 or 2, it will be routed to the root hub ports of one of the OHCI controllers for management, and low-speed and full-speed USB ...
High-Speed Inter-Chip (HSIC) is a chip-to-chip variant of USB 2.0 that eliminates the conventional analog transceivers found in normal USB. It was adopted as a standard by the USB-IF in 2007. The HSIC physical layer uses about 50% less power and 75% less board area compared to traditional USB 2.0. HSIC uses two signals at 1.2 V and has a ...
Optionally, the hub controller may draw power for its operation as a low-power device, but all high-power ports must draw from the hub's self-power. Where devices (for example, high-speed disk drives) require more power than a high-power device can draw, [48] they function erratically, if at all, from bus power of a single port. USB provides ...
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