Transmission Media Transmission Media Class 12 computer science

It is about Transmission media

1. AI PRESENTATION BY SRINIVASAN.V AARIYAN KUMAR ADHITHYAN.P.A SANJAY.B

2. TRANSMISSION MEDIA: It's meant that the 'Connection cables' or 'Connecting cables' which is used to connect two or more workstations are the communication channels. It's categorised into two Categories: Guided Transmission media Unguided Transmission media Let's see about guided transmission media.

3. Guided Transmission media are of Three types: Twisted pair cables. Coaxial cables. Optical Fibers. Twisted Pair Cable: It's a type of network cable that consists of two insulated wires twisted together to improve electromagnetic compatability and reduce inteference . The twisting of wires reduces Crosstalk.

4. Advantages of Twisted Pair Cables:​ It's simple , easy to install and maintain.​ It's physically flexible and can be connected easily.​ It has low weight and very inexpensive.​ Disadvantages of Twisted Pair Cables: Because of High attenuation it's incapable of carrying a signal over long distances. Due to it's low bandwidth make it unsuitable for Broadband application. It supports maximum data rates 1Mbps without conditioning and 10Mbps with conditining .

5. Coaxial Cables: This type of cable consist of a solid wire core surrounded by one or more foil separated by some kind plastic insulator. The inner core carries the signal, and the shield provides the ground. Due to it's high electrical property it's suitable for high speed communications. Advantages of Coaxial Cables: It is used to carry high-frequency electrical signals with low losses. It can be used for broadband transmission. It is used as the basis for a shared cable network. Offer high bandwidths upto 400Mbps.

6. Disadvantages of Coaxial Cables: It's expensive as compared to Twisted pair cables. The Coaxial Cables are not compatible with Twisted pair cables. Optical Fibres : Optical Fibres are flexible , transparent glass or plastic material that transmit light from ane end to other end. Light sources used are either (LEDs) or (LDs). The data to be transmitted is modulated into the light beams using frequency modulation techniques. 

7. Advantages of Coaxial Cables: It's highly suitable for harsh industrial environments. It guarantees secure transmission and has a very high transmission capacity. It can be used for broadband transmission where several channels are handled in parellel . It's also possible to mix data transmission channels with channels for Telescope , graphics , TV and sound. Disadvantages of Coaxial Cables : Light can reach the receiver out of the phase. Connection losses are common problems. Fibre optic cables are most difficult to solder. They are the most expensive of all the cables.