程序控制自动电话交换机
chéng​xù​kòng​zhì​zì​dòng​diàn​huà​jiāo​huàn​jī

program-controlled telephone exchange

  1. 程序控制 chéng​xù​kòng​zhì
    program control
    The practice of carrying out automatic control of a process based on a pre-written set of instructions or steps; widely used in industry, communications, and transportation.
  2. 自动电话 自動電話 zì​dòng​diàn​huà
    dial telephone
    An automatic telephone system or device that allows the caller to connect directly by dialing a number without the need for a manual operator.
  3. 交换机 交換機 jiāo​huàn​jī
    switchboard
    A central system or manual board used to connect telephone lines and route calls in a telecommunications network