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YD/T 1686-2011.Speech quality and transmission performance requirements and testing methods for IP telephony equipment. 1范围 YD/T 1686规定了IP电话设备在手柄、免提、头

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YD/T 1721.2-2007.2GHz TD-SCDMA Digital Cellular Mobile Communication Network:HSDPA Physical Layer Technical Specification Phase 2:Physical Channels an

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YD/T 1587.1-2007.Technical Specification for 2GHz cdma2000 Digital Cell Mobile Communication Network Management (Phase I)Part 1 Configuration Network

YD/T 1586.1-2007.Technical Specification for 2GHz WCDMA Digital Cellular Mobile Communication Network Management (Phase I)Part 1 Configuration Network

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YD/T 1586.2-2007.Technical Specification for 2GHz WCDMA Digital Cellular Mobile Communication Network Management (Phase I)Part 2 Performance Network R