This standard involves the use of the X.25 packet-level protocol specified in GB/T 16974 and operating on GB/T 15629 LAN. The second part of this standard specifies the operation of the logical link control (LLC) type 2 procedure X.25/PLP defined in GB/T 15629.2.
GB/T 17972-2000 history
2000GB/T 17972-2000 Information processing systems-Data communications-Use of the X.25 packet level protocol in local area networks