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  • Attachments to the Public Switched Telephone Network (PSTN) Category II Attachment Requirements for 1200 Bits per Second Half Duplex and 1200/75 Bits per Second Asymmetrical Duplex Modems Standardized for Use on the PSTN
  • Attachments to the Public Switched Telephone Network (PSTN) Category II Attachment Requirements for 1200 Bits per Second Duplex Modems Standardized for Use on the PSTN
  • 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; English version ETS 300118:1996
  • Public Switched Telephone Network (PSTN); Analogue Ringing Signals
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