Definition

transport-layer multiplexing and demultiplexing

1. The job of delivering the data in a transport-layer segment to the correct socket is called demultiplexing.
2. The job of gathering date chunks at the source host from different sockets, encapsulating each data chunk with header information to create segments, and passing the segments to the network layer is called multiplexing.

信噪比(Signal to Noise Rate SNR)

信噪比是指信号与噪声的比值

误码率(Bit Error Rate BER)

误码率是指信号中出现错误的概率

关系

信噪比与误码率之间是反比关系，即信噪比越大，误码率越低，信噪比越低误码率越大。这是因为信噪比越大，传输所用的能量就越大，更容易分辨清楚信号和噪声，从而降低了错误概率。