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Revision as of 23:38, 17 November 2009 by Alan Liefting (talk | contribs)(diff) ← Previous revision | Latest revision (diff) | Newer revision → (diff)ANSI C12.21 is the American National Standard for Protocol Specification for Telephone Modem Communication
This standard details the criteria required for communications between a C12.21 device and a C12.21 client via a modem connected to the switched telephone network. The C12.21 client could be a laptop or portable computer, a master station system or another electronic communications device.