GB/T 14381-1993 Generic specification for stored program control digital private automatic branch telephone exchange system

GB 3379 GB 3971.1 GB 6878 GB/T 3377-1982 Multifrequency register signalling system for telephone automatic switching network GB/T 3378-1982 Subscriber line signalling system for telephone automatic switching network GB/T 3380-1982 Ringing and tone for telephone automatic switching network GB/T 3873-1983 General specifications for products packaging of communication equipments GB 3971.2-1983 Interoffice junction digital line signalling system for telephone automatic switching network GB/T 3971.3-1983 The test methods for the technical specifications of multi-frequency register signalling for telephone automatic switching network GB/T 4798.1-1986 Environmental conditions existing in the application of electric and electronic products—Storage GB/T 4798.1-2005 Environmental conditions existing in the application of electric and electronic products—Section 1:Storage GB/T 4798.1-2019 Classification of environmental conditions—Classification of groups of environmental parameters and their severities—Part 1:Storage GB/T 4798.2-1996 Environmental conditions existing in the application of electric and electronic products—Transportation GB/T 4798.2-2008 Environmental conditions existing in the application of electric and electronic products—Part 2:Transportation GB/T 4798.2-2021 Classification of environmental conditions—Classification of groups of environmental parameters and their severities—Part 2:Transportation and handling GB 4943-2001 Safety of information technology equipment GB 4943.1-2011 Information technology equipment—Safety—Part 1:General requirements GB 4943.1-2022 Audio/video,information and communication technology equipment—Part 1:Safety requirements GB 4943.21-2019 Information technology equipment—Safety—Part 21:Remote power feeding GB 4943.22-2019 Information technology equipment—Safety—Part 22:Equipment to be installed outdoor GB 4943.23-2012 Information technology equipment—Safety—Part 23:Large data storage equipment GB/T 5443-1985 The test methods for the technical specifications of ringing and tone for automatic telephone switching network GB/T 5444-1985 The test methods for the technical specifications of subscriber line signalling for automatic telephone switching network GB/T 7611-2001 Characteristics of the electrical interface at hierarchical bit rate for digital network GB/T 7611-2016 Characteristics of the electrical interface at hierarchicalbit rate for digital network GB 12048-1989 Requirements for clock and synchronization equipment used in the digital network GB/T 4943.2-2026 Audio/video,information and communication technology equipment—Part 2:Explanatory information related to GB 4943.1—2022

CCITT G712 G732