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民航局通信部门于1990年在各管理局所在地安装使用美国 GWDI 公司的中高速转报系统,构成 AFTN/SITA 电报网,以美国 SPRINT 公司的 X.25分组交换网作为干线网,入网速率为9600bps,但各省局及部分航站所用 AFTN/SITA 国产转报机一直以邮电载波线路作为中继线,速率75波特,已不能满足各站日益增长的电报通信业务。随着 X.25分组交换网的扩充,有必要考虑以分组交换网作为国产转报机的联网中继线。
In 1990, the CAAC Communications Department installed the mid-high-speed reporting system using GWDI in the United States to establish the AFTN / SITA telegram network. Based on the X.25 packet-switched network of the United States SPRINT as the trunk network with a network access rate of 9600 bps However, the AFTN / SITA domestication transponders used by the provincial bureaus and some terminals have been using the postal carrier carrier lines as trunks at a rate of 75 baud and can no longer meet the growing telegraph service at each station. With the expansion of X.25 packet-switched networks, it is necessary to consider networked trunks that use packet-switched networks as domestic repeaters.