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为了提高电信网络的可靠性,并确保网络的灵活性,NTT已开始利用有线与无线两种方式实现传输线路的多路由化或双路由化,为此,在数字无线方面已开发了2、4、5、6、11、15、20GHz频带各种方式,对经济、迅速地建设数字传输线路作出了大的贡献。然而,对集中局以内的传输线路还没有引入较经济的无线方式,主要采用的是有线方式(F—6M,DP—1.5M方式等)。因此,有必要开发和有线方式具有同等经济性、适用于集中局区内传输的数字无线方式。这里介绍的11S—24M方式就是为了适应这种需要而开发的。该方式为小容量数字无线方式，采用11GHz频段，每系统传输6.312Mb/s(数字二次群)最多四个系列，每路由最多传输八个系列。本方式以1982年开发的适用于集中局区内传输，利用11GHz频带的数字无线方式—11S—D3为基础，由于采用了最新的MIC、LSI、单柱式铁塔和小容量电源装置等，实现了和有线方式同等的经济效果。11—24M方式计划1986年初提供商用，今后将大量用于集中局区内传输，可望对建设数字传输线路网和提高网的可靠性作出较大的贡献。本文介绍11—24M方式概要及主要装置概要。中山 浩
In order to improve the reliability of the telecommunication network and ensure the flexibility of the network, NTT has started to utilize the wired and wireless ways to realize the multi-pathing or dual-pathing of transmission lines. For this purpose, NTT has been developed in digital radio , 5,6,11,15,20 GHz band of various ways, the economic and rapid construction of digital transmission lines made a significant contribution. However, the more economical wireless mode has not been introduced into the transmission lines within the concentration station, but the wired mode (F-6M, DP-1.5M, etc.) is mainly used. Therefore, it is necessary to develop and have the same economy with the wired mode, which is suitable for the digital wireless mode transmitted in the central station area. The 11S-24M method introduced here is developed to accommodate this need. This mode is small-capacity digital wireless mode, using 11GHz band, each system transmits 6.312Mb / s (digital secondary group) up to four series, each transmission of up to eight series. This method is based on the 11S-D3 digital wireless system developed for transmission in the central office area and utilizing the 11 GHz band developed in 1982 and is based on the latest MICs, LSIs, single-column towers and low-capacity power supplies. The same economic effects and wired way. The 11-24M scheme is commercially available in early 1986 and will be heavily used for transmission in the central office area in the future. It is expected to make a significant contribution to the construction of the digital transmission line network and to the improvement of network reliability. This article presents a summary of the 11-24M approach and a summary of the major devices. Zhongshan Hao