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Encyclopedia > USB communications device class

USB communications device class (or "USB CDC") is a composite Universal Serial Bus device class. It provides you with a single device class, but there may be more than one interfaces implemented such as a custom control interface, data interface, audio and mass storage related interfaces etc. The USB (Type A and B) Connectors A USB Series “A” plug Universal Serial Bus (USB) is a serial bus standard to interface devices. ... ITS ALL BOUT LE2 BLOCK/HIGHFIELDS/BALLPARK WE WILL MERK U PUMS HAHAHAH SITE GOT HACKED FUKIN WANKA!! ILE CLAP U HAHAHAH REMEBER FUK LE5 ITS ALL BOUT BALL PARK I REP BP PEACE BITCH!! U DNT FUK BOUT WID ANY OFF US NAW MEAN GET MAY!!! The USB mass...


The communications device class is primarily used for modems. However it also supports ISDN and Fax machines. It also supports plain telephony applications for performing regular voice calls. A modem (from modulate and demodulate) is a device that modulates an analogue carrier signal to encode digital information, and also demodulates such a carrier signal to decode the transmitted information. ... ISDN is also short for isosorbide dinitrate Integrated Services Digital Network (ISDN) is a type of circuit switched telephone network system, designed to allow digital (as opposed to analog) transmission of voice and data over ordinary telephone copper wires, resulting in better quality and higher speeds, than available with analog... Fax (short for facsimile - from Latin fac simile, make similar, i. ... In telecommunication, Telephony encompasses the general use of equipment to provide voice communication over distances. ...


Additionally this device class supports computer networking akin to a network card, providing an interfaces for transmitting Ethernet or ATM frames onto some physical media. Microsoft Windows does not support the networking parts of the USB CDC, instead promoting its own derivative named Microsoft RNDIS, a serialized version of the Microsoft NDIS (Network Driver Interface Specification). A computer network is a system for communication between computers. ... A 1990s Ethernet network interface card which connects to the motherboard via the now-obsolete ISA bus. ... Ethernet is a large and diverse family of frame-based computer networking technologies for local area networks (LANs). ... Asynchronous Transfer Mode (ATM) is a cell relay network protocol which encodes data traffic into small fixed-sized (53 byte; 48 bytes of data and 5 bytes of header information) cells instead of variable sized packets (sometimes known as frames) as in packet-switched networks (such as the Internet Protocol... Microsoft Windows is a family of operating systems by Microsoft. ... The Network Driver Interface Specification (NDIS) is an application programming interface (API) for network interface cards (NICs). ...


This class is generally implemented in embedded systems like mobile phones to achieve more than one functionality from the device, so that a phone may be used as a modem, Fax or network port. The data interfaces are generally used to perform bulk data transfer. A router, an example of an embedded system. ...


External links

  • USB Class Definitions for Communication Devices v1.1

  Results from FactBites:
 
USB Studio (3605 words)
Devices that attach to the bus can be full-custom devices requiring a full-custom device driver to be used, or may belong to a device class.
These classes define an expected behaviour in terms of device and interface descriptors so that the same device driver may be used for any device that claims to be a member of a certain class.
USB cables and small USB devices are held in place by the gripping force from the receptacle (without the need for the screws, clips, or thumbturns other connectors require).
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