This part of GB/T 2900 specifies the terms and definitions of Integrated Services Digital Network (ISDN). This section applies to telecommunication networks and telecommunication services related to the Integrated Services Digital Network (ISDN).
GB/T 2900.69-2005 history
2005GB/T 2900.69-2005 Electrotechnical Terminology.Integrated services digital metwork (ISDN).Part 1:General aspects