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ANSI C12.21-2006 (R2023)

Protocol Specification for Telephone Modem Communication

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.

NEMA: National Electrical Manufacturers Association [nema]

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