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为了迎接信息社会的到来,在研制大容量数字通信设备的同时,为使话务量较小的地区能够经济地实现可靠的通信,研究开发了小容量数字通信设备。富士通在日本电报电话公司的指导下研制的11GHz频带小容量数字无线电设备,采用4相PSK调制,每信道传输两个非同步的PCM二次群系统13Mb/s(相当于192个话路)的数字信号。 本设备的特点如下: (1)为有效利用11GHz频带,开发应用了高频率稳定度的窄带微波滤波器。 (2)把以前分散安装的无线收发设备、线路转换设备、监测控制设备安装在1个机架上,实现设备的集约化。
In order to meet the arrival of the information society, while developing large-capacity digital communications equipment, small-capacity digital communications equipment has been researched and developed in order to enable reliable communications in economically small areas. Developed under the direction of Nippon Telegraph and Telephone Corporation, Fujitsu’s 11GHz band small capacity digital radios employ 4-phase PSK modulation to transmit two asynchronous PCM quadratic systems per channel at 13Mb / s (equivalent to 192 sessions) Digital signal. The characteristics of this device are as follows: (1) In order to effectively utilize the 11 GHz band, a narrow-band microwave filter with high frequency stability has been developed. (2) The previous scattered installation of wireless transceiver devices, line conversion equipment, monitoring and control equipment installed in a rack, to achieve the equipment of intensive.