Transmission’s Guided media with Coxial Cable

The first version of Ethernet was based on coxial cable. The original form of Ethernet 10 Base-5 used a thick Coaxial cable that was not directly connected to the computer’s NIC (Network Interface Card). An attachment unit Interface (AUI) ran from a DB15 connector on the back side of the NIC to the thick coax. A “vampire tap” is inserted into the thick coax to which the AUI is connected.
Another version of coaxial cables are there which are thinner in size and hence the name thin coaxial cable 10base-2 Ethernet cards are connected to this type of cable by a BNC (Bayonet-Neill-Concilman)- T connector on the rear side.
The physical construction of a coaxial cable has a central core made of solid or stranded copper which carries the signals. Upon the central conductor there is an insulating layer upon which a braided wire mesh is provided as shield to protect the cable from external noise. Upon this shield another insulating sheath is there enclosing which a plastic cover is provided to complete the construction of the cable.Thick and Thin coax differsin size and cable impedance. Coaxial cables are categorizrd by their Radio Government (RG) ratings each RG number denotes a set of physical specifications uniquely
Application::
Coaxial cable was extensively used in analog telephone networks to carry 10000 voice signals at a time. Later these cables were used in digital telephone networks which could carry digital data upto 600 Mbps. But coaxial cables are almost replaced today by fiber optic cables.
Cable TV networks are still running on coaxial cables in our country. However, in some advance countries these are replaced by fiber optic cables.

Advantages::
1.    Strong construction
2.    Good immunity to noise.
3.    Good LAN length.
Disadvantages::
1.    Heavy weight.
2.    Unrellable tap.

3.    High cost of installation.

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