ANSI NEMA C12.21:2006(R2023)
Current
Current
The latest, up-to-date edition.
American National Standard for Protocol Specification for Telephone Modem Communication
Available format(s)
Hardcopy , PDF
Language(s)
English
Published date
06-01-2024
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.
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