Explain any two communication channel.
ans:-Lets know about guided medium.
Coaxial cable, or coax,
- It is an electrical cable with an inner conductor surrounded by a flexible, tubular insulating layer, surrounded by a tubular conducting shield.
- The term coaxial comes from the inner conductor and the outer shield sharing the same geometric axis.
- Coaxial cable is used as a transmission line for radio frequency signals, in applications such as connecting radio transmitters and receivers with their antennas, computer network (Internet) connections, and distributing cable television signals and uses many connectors.
- It is available in two types thin (10base2; means 100 MBPS and upto 200 meter) and thick (10base5 coax;means 10 MBPS, and upto 5oo meter). They are different in diameter and bandwidth. Most of television operators use this. They are obsolete and no longer in use for computer networking
UTP:-
- Unshielded Twisted pair cabling is a type of wiring in which two conductors (the forward and return conductors of a single circuit) are twisted together for the purposes of canceling out electromagnetic interference (EMI) from external sources; for instance, electromagnetic radiation from unshielded twisted pair (UTP) cables, and crosstalk between neighboring pairs. Different pairs(colour) have different function.It has 4-pairs of copper wires.
- UTP cable is also the most common cable used in computer networking. Modern Ethernet, the most common data networking standard, utilizes UTP cables.
- Twisted pair cabling is often used in data networks for short and medium length connections because of its relatively lower costs compared to optical fiber and coaxial cable.
- It has bandwidth up to 100mbps but can be increased up to 10000 mbps.
- The rate at which signal moves is ⅔ of velocity of light.
- It is available in different categories like CAT5,CAT6 ,CAT7 etc.
