Cable TV network started its business only as a video service provider, but with the new advancement in technology, it’s moved to the business of Internet access. It also refers to the system that distributes Television signals with the utilization of transmission media. Types of Cable TV Networks are a follows –
- Traditionally Cable Networks
- Hybrid Fiber-Coaxial Network
Traditional Cable Network :
This network began to distribute the broadcast video signals to the locations with poor or no reception. Traditional Cable Network also called community antenna TV because this antenna is present at the highest of the building to receive signals from the TV stations then distribute these signals via coaxial cables to the community. The following is the schematic diagram of the traditional cable TV network.
In this, Cable TV office is referred to as the head end which can receive the video signals from broadcasting stations and then feeds the signals into coaxial cables. Due to the distance increases, the signals are getting weaker, for this purpose amplifiers were installed through this network to regenerate the signals. During this network, we have more than 35 amplifiers between the head end and the premises of subscribers. At the other end of the Cable TV network, splitters were placed to split the signal and the tap and drop cables make the connections to the subscriber premises. Communication in this network is unidirectional. The video signals were transmitted downstream from the head end to the subscriber premises.
Hybrid Fiber-Coaxial Network :
Hybrid Fiber-Coaxial Network is that the second generation of the cable network. which is a combination of fiber-optic and coaxial cable is used in this type of network. The transmission mode is used is fiber node i.e. fiber mode. The schematic diagram of the HFC network is as follows –
There are nearly 400, 000 subscribers served by Regional Cable Head (RCH). Modulation and demodulation of the signal are done through the distribution hubs after these signals are sent to the fiber nodes through fiber-optic cables. The fiber node split the analog signal so that the same signal is sent to each coaxial cable. Approx. 1000 subscribers are served by coaxial cable. Communication in this is bidirectional.
Advantages of Cable TV Network :
- Cable TV is stable in its service.
- It is fairly inexpensive.
Disadvantages of Cable TV Network :
- Due to the supply of single provider, it creates monopoly.
- It will cause to less privacy, when out TV cable it connected to the internet or world wide web.