There are two notable advantages to digital transmission. Noise does not accumulate at repeaters and thus becomes a secondary consideration in system design; whereas in analog systems it is the primary consideration.

• 数字传输有两个显著的优点:中继器中的噪音不会积累，因此在系统设计时噪音成为次要问题，而在模拟系统中则是首先要考虑的问题。