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CCITT 第ⅩⅤⅢ研究组在1977～1980研究期共有18个课题;召开过三次研究组会议和一次工作组会议;讨论了白色文件402篇[1]和迟到文件108篇[2];通过修改建议和新建议草案41份(TD-93),其中与2048Kb/S 速率系列有关的共27份。这些建议在数字网中的地位及其相互关系已归纳在图1之中。现把有关数字网技术体制的研究进展概略介绍如下[3][4]。
The Study Group XVIII of CCITT had 18 subjects during the 1977-1980 study period; three study group meetings and one working group meeting were held; 402 white papers [1] and 108 late papers were discussed; [2] 41 new proposals (TD-93), of which 27 were related to the 2048 Kb / S rate series. The status of these proposals in the digital network and their interdependencies are summarized in Figure 1. Now the research on digital network technology system is briefly introduced as follows [3] [4].