China Procedure for H-poin GB Standards Search Result |
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GB/T 29120-2012 Procedure for H-point and R-point Determination H点和R点确定程序 - 英文版 |
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GB/T 17789-1999 Procedures for simultaneous transmission of data and digitally encoded voice signals over the PSTN or over 2-wire leased point-to-point telephone type circuits 在PSTN或二线点对点租用电话型电路上同时传送数据和数字化编码语音信号的规程 - 英文版 |
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