GB/T 14373-1993 Specifications of 46 channels TDM equipment operating on 4 line telephone-type circuit

GB 7624 GB/T 7436-1987 Specifications of TDM equipment operating on an analog telephone-type circuit for telegraph and lower-speed data GB/T 3454-1982 List of definitions for interchange circuits between data terminal equipment and data-circuit-terminating equipment GB/T 3454-2011 List of definitions for interchange circuits between data terminal equipment(DTE) and data circuit-terminating equipment(DCE) GB/T 3455-1982 Electrical characteristics for unbalanced double-current interchange circuits GB/T 4797.1-2005 Environmental conditions appearing in nature of electric and electronic products—Temperature and humidity GB/T 4797.1-2018 Classification of environmental conditions—Environmental conditions appearing in nature—Temperature and humidity GB/T 3873-1983 General specifications for products packaging of communication equipments GB/T 2423.1-2001 Environmental testing for electric and electronic products—Part 2:—Test methods Tests A:Cold GB/T 2423.1-2008 Environmental testing for electric and electronic products—Part 2:Test methods—Tests A:Cold GB/T 2423.2-2001 Environmental testing for electric and electronic products—Part 2:Test methods-Tests B:Dry heat GB/T 2423.2-2008 Environmental testing for electric and electronic products—Part 2:Test methods—Tests B:Dry heat GB/T 2423.3-1993 Basic environmental testing procedures for electric and electronic products—Test Ca:Damp heat, steady state GB/T 2423.3-2006 Environmental testing for electric and electronic products—Part 2:Testing method—Test Cab:Damp heat, steady state GB/T 2423.3-2016 Environmental testing—Part 2:Testing method—Test Cab:Damp heat,steady state