Friday, January 31, 2020

Types of cables in guided media

,

Twisted-Pair cable

Image result for twisted pair
  1. It consists of four pairs of copper wires coated with an insulating materials like plastic or teflon and twisted together.
  2. It is often used data network for short and medium length connections because of it's relatively lower cost compared to optical fiber and co-axial cable.
  3. Twisted pair cables are of two types:
  • Shielded twisted pair cable (STP)
  1. Shielded twisted pair cables (STP) is similar in construction to un-shielded twisted-pair cabled wire (UTP) except that twisted pair is enclose in a woven copper for providing extra protection from external interference.
  2. It is expensive then UTP.
  3. Transmission speed is upto 500 mbps at 100m range.
  • Un-Shielded twisted pair cable (UTP)
  1. UTP cable consists of number of twisted pairs of wires with a simple plastic casing.
  2. It is commonly used in telephone line system.
  3. The commonly used UTP cable is Category 5 cable (Cat 5)  which is used with fast ethernet.

Coaxial Cable


Image result for co axial
  1. A coaxial cable has a single inner conductors that transmits electric signals,the outer conductor act as a ground,the two conductors are separated by insulation.The inner conductor,insulator and the outer conductor are wrapped in a sheath of teflon or pvc.
  2. The copper wire is used for both inner and outer conductor,the signal is transmitted over the surface of inner conductors.
  3. A thicker coaxial cable can transmit more data than thinner one.
  4. The commonly used coaxial cable is telephone trunklines, broadband internet networking cables, high speed computer data busses, carrying cable television signals, and connecting radio transmitters and receivers to their antennas.

Optical Fiber

Image result for optical fiber
  1. Optical fiber, refers to the medium and the technology associated with the transmission of information as light pulses along a glass or plastic strand or fiber. A fiber optic cable can contain a varying number of these glass fibers -- from a few up to a couple hundred.
  2. It has high bandwidth and faster speed.
  3. It's flexibility is generally high.
  4. It helps in secure transmission process.
  5. It is commonly used in surgery and dentistry,lighting and decoration and mechanical inspections.