The bandwidth of a signal is defined as the difference between the upper and lower frequencies of signal. In a communication system, the message signal can be voice, picture or computer data. This has been shown in the table given as below:
The commonly used transmission media are wire, free space, fiber optic cable (750 MHz) and optical fiber (100 GHz). This range is sub-divided further and allocated for various services as indicated in the table given as below:
