• 作者： 何定一
• 中文摘要： The first part of this report spansfrom dedicated leased line system to swit-ched data communication system. The com-parison is made from both economical andoperational point of view and in a qualitativeway only. The second part proposes an alldigital data communication system as shownin Fig. 9. Special features‘of the systemare application of baseband transmission inits local subscriber loop plant; applicationof PCM in its trunk plant and application ofstore-and-forward method in its switchingsystem. The Telecommunication Laboratoriesat Chungli has completed the developmentwork of such an experimental system includ-ing data terminals, baseband data sets anda message switching system using HP 2000Smini-computer. Demonstration was given bythe end of 1974. The development work wassupported by NSC.
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