This article approach general situation of the systematic structure of ISDN, and its form function hardware, and the constitution scheme of digit processor unit.
该文探讨了用于家庭通讯的系统结构概况及其功能硬件组成和数字处理单元的构成方案。
Y structure and function, BLSS can be divided into two parts: autotrophic unit and heterotrophic unit.
LSS在结构和功能上可以分为自养单元和异养单元两部分。
By introducing the structure and function of testing unit, this paper makes user understand the theory of the system further, and provides guidance to the operation and maintenance.
通过介绍测试装置的组成和功能，让使用者从理论上进一步了解该系统，以指导该装置操作和维护工作。
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