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![]() ![]() But it could also be interpreted to mean some Ethernet device which is connected over USB (instead of e.g. The main motivation for these protocols is to allow application-independent exchange of data with USB devices, instead of specialized protocols such as video or MTP. Even though USB is not a physical Ethernet, the networking stacks of all major operating systems are set up to transport IEEE 802.3 frames, without caring much what the underlying transport really is. The latter three are part of the larger Communications Device Class (CDC) group of protocols of the USB Implementers Forum (USB-IF). The RNDIS specification is available from Microsofts web site. However, minor modifications of the standard, so-called subsets, make practical implementations possible on such platforms. Remarkably, even some of the most modern platforms need minor accommodations and therefore support for these subsets is still needed. This was a good strategy for USB 1.1 systems (current when the protocol was issued) with 64 byte packets but not for USB 2.0 systems which use 512 byte packets. After this, there is bus latency, where nothing is sent until another transfer can be initiated. This reduces bus occupancy, meaning that nothing is sent for considerable fractions of bus time. A gap every 23 frames is not noticeable, but a gap every three frames can be very costly to throughput. It creates a Linux network interface, which can be assigned an IP address and otherwise treated the same as a true Ethernet interface. Any applications that work over real Ethernet interfaces will work over a USB-eth interface without modification, because they cant tell that they arent using real Ethernet hardware. Usbnet Driver Available ForThe Bahia Network Driver 2 is a usbnet-style driver available for Win32 hosts. The Linux kernel for the iPAQ uses this communications strategy exclusively, since the iPAQ hardware has neither an accessible legacy (RS-232 RS-422 ) serial port nor a dedicated network interface. Usbnet Software Package DeterminesUpon starting the USB connection, the software package determines, which host it is connected to, and then starts the required class, RNDIS or CDC-ECM (Communication Device Class, Ethernet Control Model) and all IP-Services required for operation. By using this site, you agree to the Terms of Use and Privacy Policy. Wikipedia is a registered trademark of the Wikimedia Foundation, Inc., a non-profit organization.
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