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[GB 4576-1984] 载波系统基群变频基本技术要求[已作废]
发布时间：1985-04-01
实施时间：1985-04-01
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[GB 4577-1984] 载波系统通路变频级基本技术要求[已作废]
发布时间：1985-04-01
实施时间：1985-04-01
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[YD/T 553-1992] 载波系统基群变频级基本技术要求[现行]
发布时间：1900-01-01
实施时间：
原GB 4576-84调整为YD标准 ，无行标文本。
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[YD/T 554-1992] 载波系统通路变频级基本技术要求[现行]
发布时间：1900-01-01
实施时间：
原GB 4577-84调整为YD标准 ，无行标文本。
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