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CDMA (Code Division Multiple Access) is a form of multiplexing and a method of multiple access that uses different codes for each user to divide up a radio channel. The same channel is occupied by many codes, but only the users given a shared code can understand each other. CDMA also refers to a digital mobile telephony system with this multiple access scheme. The GSM standard specifies an entire network infrastructure, while CDMA relates only to the radio part of the technology. See also GSM.