Public Switched Telephone Network (PSTN) - Category II specification for 1200 bits per second half duplex and 1200/75 bits per second asymmetrical duplex modems standardized for use on the PSTN
This ETS contains the technical characteristics required for end-to-end interworking over the Public Switched Telephone Network (PSTN) of modems supporting: - half duplex operation over the PSTN at 1200 bit/s, and or - asymmetrical duplex operation over the PSTN at 1200/75 bit/s standardized for use over the PSTN, in accordance with CCITT Recommendation V.23 [3].