In 1979 a characteristic model machine of 100 line SPC picturephone exchange was developed in Beijing Institute of Posts and Telecommunications. The structure of its hardware and software are all rather simple. It is mainly used as a teaching model.

• 北京邮电学院于1979年研制成了100门程控电视电话交换机的性能样机,该机的硬件和软件结构都比较简单,主要作为教学模型用。