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USB 4 (formally known as “USB4” without the spaces) is an important upgrade not only because of its new features, but also because it removes the confusion associated with USB 3.x naming and provides a predictable and understandable experience for the user. USB4 protocol requires a USB-C <-> USB-C cable.
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Data transfer speeds up to 40 Gbps: USB4 devices must support 20 Gbps (2.4 GB/s). USB4 devices must support 20 Gbps (2.4 GB/s). If the device uses a shorter 40 meter Gen 4.8 cable, it can support an additional 3 Gbps (0.8 GB/s).
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Multiple data and display protocols: The USB4 supports USB 3.2, PCIe, and DisplayPort 1.4a through a technology known as protocol tunneling; alternate modes also support DisplayPort and Thunderbolt 3.
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Backward Compatibility with USB 3.2, USB 2.0, and Thunderbolt 3: The USB4 supports compatibility with previous versions of the USB specification and, thanks to its Thunderbolt 3 base, also supports TB3 alternate mode.
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Video and data bandwidth optimization: USB 3.2 allocates a fixed bandwidth for data or video signals, and provides 100% bandwidth for video in DP Alt mode. the USB4 dynamically allocates video and data bandwidth based on actual needs.
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100W Charging: All USB4 devices support USB power. When a device is plugged into a USB4 port, USB PD is “contracted” to supply power, safely delivering up to 100W (5A/20V).
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What is protocol tunneling?
When devices communicate with each other, they use a specific protocol to communicate. If both devices can communicate and understand the same protocol, a connection will be established. Essentially, protocol tunneling uses one protocol to create a “channel” and uses it to send data in another protocol. usb4 protocol tunneling creates a USB-C tunnel through which DisplayPort or PCIe data can be sent. usb4 protocol tunneling is similar to standby mode, but USB4 protocol tunneling is similar to standby mode, but it does not require a DP or PCIe controller.
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What is a USB4 Fabric?
The term “fabric” is a metaphor used to describe a network of interconnected devices such as switches. In the picture, the intersecting devices resemble the structure of a fabric. the USB Implementers Forum (USB-IF) uses this term to describe how the USB4 tunneling architecture dynamically manages connections between USB4 routers so that multiple protocols can use switch resources at once.
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