【摘要】 设计了一种无需交换中心的分布式控制数字电话系统 .系统设备以通用数字环路收发机辅机 U DTL话音 /数据集成电路为核心芯片 ,并使用微处理器 MPU实现对整机的控制 .它能提供标准 B+D全双工通信 ,不仅能实现公用模拟电话机的功能 ,而且具有路由选择的能力 .更多还原

【Abstract】 A distributed type control digital telephone system which needs no switching center is described. The nudeus of the system is the speech/data integrated circuit or the universal digital loop transceiver (UDLT). The whole system works under the control of a microprocessor. It is able to provide with the standard B+D full duplex communication. Besides, all the functions of common analog telephone can be implemented as well, with also the ability of routing.更多还原