By | July 29, 2019
Guided media

Guided media|| bounded transmission media with examples?

Content:

Guided media|| bounded transmission media with examples?

Twisted pair

  • Unshielded Twisted Pair (UTP)
  • Shielded Twisted Pair (STP)

Coaxial cable
Optical fiber

 

Guided media|| bounded transmission

The guided media is a physical media through which the signals are passed/transmitted. The guided media is also called bounded media.
or
The guided media is something that provides a conduit from one electronic device to another electronic device. The signals which travel along with the guided media, it is directed and contained by the physical limits of the medium.
or
The guided media is a sort of transmission media that uses a cable system that guides the data signals along a path/specific path. These data signals are bound by the cables. They do not have any other way to pass through. They have to pass by these cables/wires at any cost.

There are three major types of Guided Media:
1. Twisted pair
2. Coaxial cable
3. Optical fiber

 

Twisted pair:

Twisted pair cable is a physical media. It is made with the pair of two cables/wires which are twisted with each other. The twisted-pair cable is of low cost. The installation of the twisted pair cable is also easy as compared to other transmission media.

Twisted pair cable is a very lightweight cable. The frequency range for this cable is 3.5KHz. It consists of two conductors, both with its own plastic installation. Normally these conductors are copper. One wire from these is used to send signals to receivers.

The second one is used as a ground reference only. The receiver uses the difference between both. The signal sent by the sender on one wire, interference and crosstalk may affect both cables/wires.

It may create an unwanted signal. If both of these wires are parallel, the effect of unwanted signals is never the same in both wires. This results in a difference at the receiver side.

 

Guided media

Twisted pair comes in two different types:

1. Unshielded Twisted Pair (UTP):

It is used in telecommunication. It is used for long-distance communication. Following are some categories of this cable:
i. It is used with telephone lines.
ii. It supports up to 4Mbps.
iii. It supports up to 16Mbps.
iv. It supports upto 20Mbps.
v. It supports upto 200Mbps.

2. Shielded Twisted Pair (STP):

It contains the mesh surrounding the wire which allows the higher transmission rate. Following are some characteristics of Shielded twist pair:
i. The cost of the shielded twist pair is neither too high nor too low.
ii. The installation of shielded twist pair is very easy.
iii. The shielded twist pair has a higher capacity.
iv. It can provide a higher data transmission rate because it is shielded.
v. The attenuation rate of the shielded twist pair is higher.

 

Coaxial cable:

It is called coaxial cable because it contains two conductors and these conductors are parallel to each other. Coaxial cable is a very common transmission media being used today. For example, The wire of television is usually a coaxial cable. Coaxial cable has a higher frequency if it is compared with twisted pair cable. The inner conductor of this cable is made up of copper, the middle core is made up of non-conductive cover, and the outer conductor is made up of copper mesh. The middle core separates the inner conductor from the outer conductor. The middle core transfers the data and the copper mesh prevents from EMMI (Electromagnetic interference).
Coaxial Cable is divided into two following types:
1. Baseband transmission:

Single signal transmission at a time with high speed.
2. Broadband transmission:

Multiple signal transmission at a time with high speed.

 

Guided media

Fiber Optic:

Fiber optic cable is made up of plastic or glass. These types of cable transmit signals in the form of light from one place to another. In another way, Fiber optic cable uses the electrical signals for communications. Fiber optic cable holds optical fibers.

These optical fibers are coated in plastic and send the data by pulses of lights. The plastic coating is actually used to protect the optical fiber from heat, cold, and electromagnetic interference from another wiring (other types of wiring). The data transmission of fiber optic is faster from copper wires.

 

Guided media

Following are the basic elements of fiber optic cable:
1. Core:

It consists of a narrow strand of plastic or glass which is called core. The core is used as a light transmission area. The more area means that more light will be transmitted into the fiber.

2. Cladding:

The glass has a layer, concentric layer, that is called cladding. Cladding is used to provide the lower refractive index at the core interface to cause reflection within the core. In this way, the light waves are transmitted through the fiber.

3. Jacket:

The jacket is used to preserve fiber strength. It absorbs shock and provides extra fiber protection.

 

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