CS-Notes/docs/notes/计算机网络 - 物理层.md
2019-03-18 10:49:28 +08:00

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* [通信方式](#通信方式)
* [带通调制](#带通调制)
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# 通信方式
根据信息在传输线上的传送方向,分为以下三种通信方式:
- 单工通信:单向传输
- 半双工通信:双向交替传输
- 全双工通信:双向同时传输
# 带通调制
模拟信号是连续的信号,数字信号是离散的信号。带通调制把数字信号转换为模拟信号。
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