HJD-80型程控交换机是邮电部为发展我国通信事业组织有关部门进行优化设计的小型程控用户交换机,通话连接网络及其控制电路,全部采用高可靠性中大规模集成电路,可靠性高,体积小,重量轻,耗电省,采用小型积木结构和印制板插拔技术,便于安装扩容,易于维修。主要功能:内部直拨功能、市话直拨分机功能、分机拨市话功能、八级用户等级限制(即限制内部用户打市话、国内国际长途等功能)、限制特服权的功能(即限打160、168等语言信息台)、自动计 HJD-80 program-controlled switches is the Ministry of Posts and Telecommunications to develop the relevant departments of China’s communications industry to optimize the design of small program-controlled user switches, call connection networks and control circuits, all of the high reliability of large scale integrated circuits, high reliability, volume Small, light weight, low power consumption, the use of small building blocks and PCB pluggable technology, easy installation and expansion, easy to maintain. Main functions: internal direct dialing function, local call direct extension function, extension dialing local call function, level eight user level restriction (that is, limiting domestic users to dial local calls, domestic and international long distance functions), limiting special service functions Such as language information platform), automatic calculation