本文介绍了公用和专用分组交换数据网的现状后，说明了开展标准的增值业务系统的重要性。
In this paper, after analysing the status on public and private PSDN, the significance of standard-based value added service systems is indicated.
最后建议全国只建一个分组交换公用数据网。
Finally, we consider it more advisable to establish only one PSPDN in our country.
最后建议全国只建一个分组交换公用数据网。
Finally, we consider it more advisable to establish only one PSPDN in our country.
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