STP - Shielded Twisted Pair (see AWG & UTP)- relating to communications wire and cable that has copper conductors that are twisted to reduce or eliminate interference and crosstalk with an internal cable shield necessary for installation in locations susceptible to high levels of interference, 71. UTP - Unshielded Twisted Pair (see AWG & TWP) - relates to communication wire and cable that has copper conductors and are twisted to reduce or eliminate interference and cross-talk without an internal cable shield, 80. The major drawback is that it needs amplification after every 1000 feet.One section of the cable is about 0.3 m long and terminates in a dry-mateable con- nector (1 UTP and 1 fibre) to connect to the breakout box in the VEOC.

This is a 50 ohm () coaxial cable which is used for digital transmission.īaseband transmits a single signal at a time with very high speed. The outermost part is the plastic cover which protects the whole cable. Outer metallic wrapping is used as a shield against noise and as the second conductor which completes the circuit. It is surrounded by PVC installation, a sheath which is encased in an outer conductor of metal foil, barid or both. It is more expensive than coaxial and unshielded twisted pair.Ĭoaxial is called by this name because it contains two conductors that are parallel to each other.Ĭopper is used in this as centre conductor which can be a solid wire or a standard one. Shielding also eliminates crosstalk (explained in KEY TERMS Chapter). This cable has a metal foil or braided-mesh covering which encases each pair of insulated conductors.Įlectromagnetic noise penetration is prevented by metal casing. The wires are twisted together in a helical form to reduce electrical interference from similar pair. Identification is the reason behind coloured plastic insulation.Ĭable with 2 pair use RJ-11 connector and 4 pair cable use RJ-45 connector. It is the most common type of telecommunication when compared with Shielded Twisted Pair Cable which consists of two conductors usually copper, each with its own colour plastic insulator. This cable is the most commonly used and is cheaper than others. It is the transmission media in which signals are confined to a specific path using wire or cable.

Transmission m edium is the means through which we send our data from one place to another.

Electromagnetic signals travel through vacuum, air or other transmission mediums to travel between one point to another(from source to receiver).Įlectromagnetic energy (includes electrical and magnetic fields) includes power, voice, visible light, radio waves, ultraviolet light, gamma rays etc.

Twisted pair cable in hindi