论文部分内容阅读
各种载波传输终端设备中,群路转换和超群转换设备只是通路转换设备的再次复用.按照扩大长途电话网的需要,比如作为微波无线电中继系统和12MC,60MC同轴电缆系统终端设备的通用部件需要大量应用这些转换设备.现在使用的群路和超群转换设备已先后在1964和1965年实现了全晶体管化,而且已经大量产生.但是,近年来,由于高速传真,数据传输等,宽频带业务的选速增长,这些设备已不能满足传输质量的需要.在这种情况下,CCITT提出了适应宽频带信号业务需要的群路和超群制式的新建议.新的群路转换设备和超群转换设备的容量要比目前使用的设备分别大两倍和一倍.由于采用了晶体管调制器,集成放大器和电阻的混合集成电路,高可靠性磁性元件和减小滤波器的体积,以及装配技术的改进和精密的安装结构,而提高了设备的容量.
Among the various carrier transmission terminal devices, the group switching and the superior switching device are only the reuse of the path switching device. According to the requirement of expanding the long distance telephone network, for example, as a microwave radio relay system and a terminal device of a 12MC, 60MC coaxial cable system Common components require a large number of applications of these conversion devices.Currently used in the group of road and superior conversion equipment has been achieved in 1964 and 1965 all-transistorization, and has been produced in large quantities.But in recent years, due to high-speed fax, data transmission, broadband With the rapid growth of services, these devices are no longer able to meet the requirements of transmission quality.In this case, CCITT proposed a new proposal to adapt to the requirements of wideband signal services and supergroup systems. The capacity of the conversion device is twice and twice as large as the currently used devices, respectively. Due to the adoption of transistor modulators, hybrid ICs with integrated amplifiers and resistors, high reliability magnetic components and reduced filter size, as well as assembly techniques The improvement and precision of the mounting structure, while increasing the capacity of the device.