Says NASA about the flight control system: "Each of the three digital flight control computers had an analogbackup."
美国宇航局说，对飞行控制系统：“这三个数字式飞行控制计算机每有一个模拟备份。”
2
Alarms that use the analog network as a main or backup link may lose their connection to alarm centers.
警告显示，模拟网络作为主要的或是后备链接，可能会丢失他们与报警中心的联系。
3
Application: watches (digital and analog), calculator, electronic notebook, electronic keys for automobile, card radio, medical equipment, memory backup power source.