As regards economy, early studies offered significant advantages since a substantial quantity of interface equipment in the telephone exchange could be eliminated.
至于经济性，早期的研究表明，由于数字业务可以省掉电话交换中大量的接口设备，因而具有重要的优势。
As regards economy, early studies offered significant advantages since a substantial quantity of interface equipment in the telephone exchange could be eliminated.
至于经济性，早期的研究表明，由于数字业务可以省掉电话交换中大量的接口设备，因而具有重要的优势。
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