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
公共交换电话网(PSTN).在PSTN上标准化使用的每秒1200位半双工和每秒1200/75位非对称双工调制解调器的II类规范;英文版ETS 300118:1996