ETSI PRETS 300 118-1995 终端设备(TE).公共交换电话网(PSTN)附件.PSTN 1,200 bits/s半双工和1,200/75 bits/s非对称标准化双工调制解调器第II类附加要求(第2版)
Terminal Equipment (TE); Attachments to the Public Switched Telephone Network (PSTN); Category II Attachment Requirements for 1 200 Bits per Second Half Duplex and 1 200/75 Bits per Second Asymmetrical Duplex Modems Standardized for Use on the PSTN 2nd ED