大规模集成电路是1240程控交换(简称S 12)系统中三种尖端技术之一。其国产化包括两个内容: 1.九种专用大规模集成电路制造技木的转让; 2.向用户大批量地提供使用寿命至少25年的高可靠电路。一、九种专用大规模集成电路功能简介 S 12系统是一种全分布控制的模块式程控电话交换机,其结构可大致分为三部分。核心部份是数字交换网络,外围是各种功能模块,例如模拟用户模块、时钟与信号音模块、数字中继模块、服务电路模块、维护及外设模块等,以及它们之间的终端控制单元。九种专用大规模集成电路在S12系统中的分布情况如表1所示。下面简述每一种专用大规模集成电路的主要功能(以模拟用户模块为例)。 1.DUSP(dual switch port) 它由两对交换端口组成,可对两路彼此不相干的4.O96Mb/s的脉码调制信号进行智能时间-空间交 Large-scale integrated circuits are one of three cutting-edge technologies in the 1240 Program-Controlled Exchange (S12) system. Its localization includes two contents: 1. The transfer of manufacturing technology of nine kinds of special large-scale integrated circuits; 2. High-reliability circuits that provide users with large quantities of service life for at least 25 years. First, the nine kinds of special large-scale integrated circuits Functional Description S 12 system is a fully distributed control modular program-controlled telephone switches, the structure can be broadly divided into three parts. The core part is digital switching network, the periphery is a variety of functional modules, such as analog user module, clock and tone module, digital relay module, service circuit module, maintenance and peripheral modules, as well as between them the terminal control unit . Nine kinds of special large scale integrated circuits in the S12 system distribution in Table 1 below. The following briefly describes each of the major functions of a large scale integrated circuit (to simulate the user module, for example). 1.DUSP (dual switch port) It consists of two pairs of switching ports, two independent of each other 4.O96Mb / s pulse code modulation signal intelligent time - space to pay