Guided Media

Topics: Twisted pair, Coaxial cable, Optical fiber Pages: 7 (1472 words) Published: January 7, 2013
Transmission media
2.Factors Effecting Data Communication:
Transmission impairments
No. of receivers
3.Factors of choosing transmission medium
Transmission Rate
Cost and Ease of Installation
Resistance to Environmental Conditions
4 :Categories
Bounded/Guided Media
Unbounded/Unguided Media
5.Bounded/Guided Media
Coaxial Cable
Twisted Pairs Cable
Fiber Optic Cable


TRANSMISSION MEDIUM Transmission medium is the physical path between transmitter and receiver in a data transmission system.The characteristics and quality of data transmission are determined both by the characteristics of the signal.

Factors Effecting Data Communication Of Medium

All other factors remaining constant, the greater the bandwidth of a signal, the higher the data rate can be achieved. Transmission Impairments:
Impairment, such as attenuation, limit the distance. For guided media, twisted pair generally suffers more impairment than coaxial cable, which in turn suffers more than optical fiber. Number of Receivers:

A guided media can be used to construct a point to point link or a shared link with multiple attachments.

Transmission media can be classified or unguided. In both cases, communication is in the form of electromagnetic waves. With guided media, the waves are guided along a solid medium, such as copper twisted pair, copper coaxial cable, and optical fiber. The atmosphere and outer space are examples of unguided media that provide a means of transmitting electromagnetic signals but do not guide them; this form of transmission is usually referred to as wireless transmission systems.

Coaxial cable

Low cost
Easy to install
Up to 10Mbps capacity
Medium immunity form EMI
Medium of attenuation
Easy to wire
Easy to expand
Moderate level of EMI immunity
Single cable failure can take down an entire network
Twisted Pair Cable
The most popular network cabling is Twisted pair. It is light weight, easy to install, inexpensive and support many different types of network. It also supports the speed of 100 mps. Twisted pair cabling is made of pairs of solid or stranded copper twisted along each other. The twists are done to reduce vulnerably to EMI and cross talk. The number of pairs in the cable depends on the type. The copper core is usually 22-AWG or 24-AWG, as measured on the American wire gauge standard. There are two types of twisted pairs cabling 1. Unshielded twisted pair (UTP)

2. Shielded twisted pair (STP)
1. Unshielded twisted pair (UTP)
UTP is more common. It can be either voice grade or data grade depending on the condition. UTP cable normally has an impedance of 100 ohm. UTP cost less than STP and easily available due to its many use. UTP

There are five levels of data cabling
Category 1
These are used in telephone lines and low speed data cable.
Category 2
These cables can support up to 4 mps implementation.
Category 3
These cable supports up to 16 mps and are mostly used in 10 mps. Category 4
These are used for large distance and high speed. It can support 20mps. Category 5
This is the highest rating for UTP cable and can support up to 100mps. UTP cables consist of 2 or 4 pairs of twisted cable. Cable with 2 pair use RJ-11 connector and 4 pair cable use RJ-45 connector. Characteristics of UTP

low cost
easy to install
High speed capacity
High attenuation
Effective to EMI
100 meter limit
Advantages of UTP
Easy installation
Capable of high speed for LAN
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