group7_rothman:Transmission media

Transmission Media describes the type of physical system used to carry a communication signal from one system to another. Examples of transmission media include twisted-pair cable, coaxial cable, and fiber optic cable.

There are 2 basic categories of Transmission Media:

1. Guided
2. Unguided

Guided Transmission Media uses a "cabling" system that guides the data signals along a specific path. The data signals are bound by the "cabling" system. Guided Media is also known as Bound Media. Cabling is meant in a generic sense in the previous sentences and is not meant to be interpreted as copper wire cabling only.

There 4 basic types of Guided Media:

Open Wire
Twisted Pair
Coaxial Cable
Optical Fiber

Unguided Transmission Media consists of a means for the data signals to travel but nothing to guide them along a specific path. The data signals are not bound to a cabling media and as such are often called Unbound Media. The three guided media commonly used for transmission are twisted-pair,coaxial and fiber optic cable.

Unguided media,transmission and reception are achieved by means of an antenna.

The various types of waves used for wireless transmission are:

Terrestrial microwave

Satellite microwave

Broadcast radio

Infrared

Wireless propagation is through one of the following routers:

-Ground wave

-Sky wave

-Light of sight