China National Standards

China Interoffice junction digital GB Standards List

  •  China "Interoffice junction digital" GB Standards List:
    • Standard  Code Standard Title Standard Class Order
    GB 3971.2-1983 Interoffice junction digital line signalling system for telephone automatic switching network
    电话自动交换网局间中继数字型线路信号方式    		 China National Standards
    Interoffice junction digital
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