ETSI PRETS 300 116-1995 终端设备(TE).公共交换电话网(PSTN)附件.PSTN 1,200 bits/s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 Duplex Modems Standardized for Use on the PSTN Second Edition