Telecommunications Media/Channel. And its different types
Telecommunications Media/channels (communications lines or links) is the path that connects sender and receiver to transfer data between sending and receiving devices in a telecommunications network. There are different types of telecommunication media/channel.
1 Guided media
2 Unguided media
1) TWISTED PAIR CABLE:
Twisted pair wire consists of two strands of insulated copper wire. Twisted around each other in pair. They are then covered by another layer of plastic insulation. Twisted pair cabling is the same type of cabling system used for home and office telephone system and local area networking.
Advantage: Inexpensive easy to install.
Disadvantage:- Create noise Transmission interrupted by magnetic field.
2) COWAL CABLE Coaxial cable consists of insulated copper or aluminum wire covered by insulating material and then covered by copper mesh. It is widely used for cable television and local area network. It allows high-speed data transmission. The extra insulation makes coaxial cable much better resisting noise than twisted pair wiring.
Advantage:-The extra insulation makes coaxial cable much batter resisting noise. Transmit data much faster than twisted pairs.
Disadvantage:- Expansive than twisted pair.
3) FIBER OPTIC CABLE
This cable consists of hundreds or thousands of thin strands of glass that transmit pulsating beams of light instead of electricity. It is thinner than a human hair. Data transfer rate is very fast. There is no chance of data loss. Light pulse is not affected by random electromagnetic interference. They have much lower error rates than normal telephone twisted pair or coaxial cable. if half population of the world is on one side of a single fiber optics cable and the other ha on the other side of the same fiber optics cable, then they can communicate with each other if proper multiplexing techniques are used.
This cable consists of hundreds or thousands of thin strands of glass that transmit pulsating beams of light instead of electricity. It is thinner than a human hair. Data transfer rate is very fast. There is no chance of data loss. Light pulse is not affected by random electromagnetic interference. They have much lower error rates than normal telephone twisted pair or coaxial cable. if half population of the world is on one side of a single fiber optics cable and the other ha on the other side of the same fiber optics cable, then they can communicate with each other if proper multiplexing techniques are used.
Advantage:- it cannot be easily wiretapped or listened, so transmissions are more secure.
Disadvantage:- The main drawback until recently have been cost and the materials and inability to bend around tight covers.