A Transmission medium is necessary to communicate information from a source to a destination. The information is generally a sign that has to travel a long distance. For this, the transmission media may be wired or wireless. There are three different types of cables for example.
- Twisted pair cable
- Coaxial cable
- Fiber optic cable
One wire carries the signal and other is used as ground reference. The advantage of twisting is that both wires are likewise affected by outer influences. So the undesirable signs are counterbalanced since the collector calculates the distinction between signs in two wires.
This cable is of two types for example.
1-UTP (unshielded twisted pair)
2-STP (shielded twisted pair)
Performance Of twisted-pair cable is quantified by comparing attenuation versus recurrence. Attenuation increases with recurrence over 100 kHz. These BMA cables are used in telephone lines to give voice and data channels. DSL lines and Local land networks use twisted pair wires.
Coaxial Cable carries high recurrence signals than twisted-pair cables. Coax includes a central center conductor of strong wire enclosed in an insulator, which is covered by an outer strand of metal foil. This outer conductor completes the circuit. These cables are categorized by RG (radio authorities) ratings. RG-59 utilized for Cable TV, RG-58 for dainty Ethernet and RG-11 for thick Ethernet. The connector used in these wires is named BNC connector; it is used to connect the end of this cable into a gadget.
Though the water proof cable company has greater data transmission, however its attenuation is a great deal higher compare to twisted-pair cables. It is generally utilized in advanced telephone networks where one cable can communicate information up to 600 Mbps. Cable TV networks use RG-59 coaxial cable. Conventional Ethernet LANs also use this cable.
A fiber optic cable transmits signals as light. Optical fiber use reflection to guide light through a channel. Cladding acts as a protective cover to center. The differentiation in density of core and cladding is that a light emission moving through the center is reflected off the cladding, rather than being refracted into it.
Two modes of Propagation of light are possible in optical fiber for example: multimode and single mode. Multimode fiber enables numerous beams from a light source precede throughout the core. In multimode step-record fiber, the core density stays constant from the center to the edges. Nevertheless, in multimode reviewed list fiber, core density steadily decreases from the focus of the heart to its advantage. Evaluated file fiber creates less distortion in the signal compare to step-file.