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[GB 3379-1982] 电话自动交换网局间直流信号方式[已作废]
发布时间：1982-01-02
实施时间：1983-10-01
本标准规定我国电话自动交换网纵横制局间及其与其他指定制式局间的直流信号和相关技术指标。本标准所用中继..
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