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TIA-602 Revision A, August 1, 2000
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Data Transmission Systems and Equipment- Serial Asynchronous Automatic Dialing and Control
Includes all amendments and changes through Reaffirmation Notice , July 29, 2014
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This Standard is applicable to the interconnection of data terminal equipment (DTE) and data circuit-terminating equipment (DCE) employing serial binary data operation via the ITUT Recommendation V.24, 100-series interchange circuits. This Standard, through reference to ITU-T Recommendation V.250, provides four elements:

-- codifies existing practice in common asynchronous DCE that use the AT command set. It identifies the protocol elements procedures, and behaviors that were found to be held in common among a large portion of DCE manufacturers;

-- defines a format for extension of the AT command set in an orderly fashion. It reserves the "+" command prefix to be used by other standardized extensions;

-- provides a set of standardized extensions, based on the extended "+" command format.