1. Shannon Theory: C= BWx log2(1+ SNR)
C refers to the information carrying capacity (bits/second, bps), BW ( BandWidth) is the link bandwidth (Hz), and SNR is the signal-to-noise ratio.
2. The information-carrying capacity of the telecommunication system is proportional to its bandwidth, and the bandwidth is proportional to the frequency of the carrier. The information carrier of fiber optic communication system uses light one by one carrier with the highest frequency of all available signals, which is the reason why fiber optic communication systems have the highest capacity to carry information and why they are the key technology of modern telecommunications.
(Note: The bandwidth is roughly 10% of the carrier signal frequency.)
3. A coaxial cable can support 13,000 channels, a microwave link on land can support up to 20,000 channels, a satellite link can support 100,000 channels, and a fiber optic communication link, can support 300,000 two-way voice channels at the same time.
