使用26GHz频带的一种点对点(P—P)数字用户无线系统已经开发出来.这种系统在NTT的一个中央站与分站(用户)之间传输64～6,144kb/s数字信号.它是高速数字通信业务中用户传输系统的一种,该系统是1984年秋季开始服务.P—P系统有如下特点:(a)无线发送和接收设备的高频(RF)部分由MICs所组成,实现了设备小型化和降低造价,因为小而轻,电路安装和迁移容易;(b)因用于该系统的频率位于P—MP系统的防护频带内,P—P系统和P—MP系统可共容同一线路;(c)因P—P系统的原始价格低于P—MP系统的价格, A point-to-point (P-P) digital subscriber wireless system using the 26 GHz band has been developed that transmits 64 to 6,144 kb / s digital signals between a central station and a substation (subscriber) in NTT. It is a high speed A system of subscriber transmission in the digital communications service that began service in the fall of 1984. The P-P system has the following features: (a) The high frequency (RF) portion of the wireless transmitting and receiving equipment is comprised of MICs that enable Equipment miniaturization and cost reduction due to small and light, easy circuit installation and relocation; (b) P-P systems and P-MP systems can be co-accommodated as the frequency used for the system is within the guard band of the P-MP system Same line; (c) Because the original price of P-P system is lower than the price of P-MP system,