Physical Transmission MediaThis is a featured page

How does it work?

Physical transmission media use wire, cable, and other tangible materials to send communications signals. They include twisted-pair cable, coaxial cable, and fiber-optic cable.

Twisted-Pair Cables consist of one or more twisted-pair wires bundled together. Each twisted-pair wire consists of two separate insulated copper wires that are twisted together to reduce noise, which is an electrical disturbance that can interfere with communications.
Advantages: It is easy to string, and very cheap!
Disadvantages: Subject to noise

Physical Transmission Media - The ITGS Wiki at BHS
Coaxial Cables consist of single copper wires surrounded by at least three layers:
1) an insulated material
2) a woven or braided material
3) a plastic outer coating.
Advantages: Not susceptible to interference, and transmits faster
Disadvantages: It is heavy and bulky. Needs a booster over longer distances.It is heavy and bulky.


Physical Transmission Media - The ITGS Wiki at BHS

Both Twisted Pair Cables and Coaxial Cables send data through electric frequencies.




Fiber-Optic Cables consist of dozens or hundreds of hair-thin strands of glass or plastic, called optical fibers that carry data as pulses of light. Each optical fiber cable is insulated with glass cladding and a protective coating surrounding each optical fiber.
Advantages: They carry more signals than the two above cables, which allows for faster data transmission. It is also less susceptible to noise from other devices, and it is much smaller, thinner, and more lightweight.
Disadvantages: But with great advantages come great cost; it is the most expensive out of the three cables. It is also much harder to install and modify.
What's it used for?Most physical transmission media is used either within or underground between buildings. Ethernet and token ring LANs often use physical transmission media, as well. Twisted-pair cables are mainly used for network cabling and telephone systems. Coaxial Cables are usually used for Cable Television (CATV), because it can be cabled over longer distances than twister-pair cables. It is not as well-used anymore because fiber-optic cables transmits data at much faster rates. Fiber-optic cables are used in businesses and as a backbone for bus topology .


Physical Transmission Media - The ITGS Wiki at BHS






No user avatar
Shortalmainway
Latest page update: made by Shortalmainway , Sep 22 2009, 4:44 PM EDT (about this update About This Update Shortalmainway Edited by Shortalmainway


view changes

- complete history)
Keyword tags: None
More Info: links to this page
There are no threads for this page.  Be the first to start a new thread.