先决条件 – 传输媒体的类型
同轴电缆：
同轴电缆是一类用于传输大频率信号的引导介质。同轴电缆由实心导体、三层绝缘层和接地导体组成。在同轴电缆中，内部实心导体有助于以电信号的形式传输信号。同轴电缆通常用于互联网连接、电视信号分配和无线电传输。
双绞线电缆：
双绞线电缆是一种引导介质，其中通过将两根线绞合来进行传输而形成电路。双绞线电缆由绝缘铜线组合而成。在双绞线电缆中，金属铜线有助于以电信号的形式传输信号。双绞线电缆主要用于电话网络和电缆屏蔽。
同轴电缆和双绞线电缆的区别如下：
| S.No. | Coaxial cable | Twisted Pair Cable |
|---|---|---|
| 1. | In coaxial cable, transmission of signals happens via inner conductor of cable. | In twisted pair cable, transmission of signals happens via metallic conducting wire. |
| 2. | Coaxial cables are difficult to install and implement. | While twisted pair cables are easy to install and implement. |
| 3. | Coaxial cable has finest noise protection as compared to twisted pair cable. | In twisted pair cable, there is lowest noise immunity. |
| 4. | Coaxial cable supports a bandwidth of moderate range. | Twisted pair cable supports a bandwidth of low range. |
| 5. | Applications of coaxial cable are in internet connections, television signal distribution and radio transmissions, etc. | Applications of twisted pair cable are in telephone networks and cable shielding. |
| 6. | Cost of coaxial cable is comparatively expensive. | Cost of twisted pair cable is less as compared to coaxial cable. |