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Complete Assignment no 3 solution download below

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CS601 Assignment # 3 Solution

Question 1: [5]
According to your point of view, which one of the following guided media is better
and why? Justify your answer with solid reasons.
1. Twisted pair cable
2. Coaxial cable
3. Fiber optical cable
Answer:
Optic fiber is the newest form of bounded media. This media is superior in data handling
and security characteristics. The fiber optic cable transmits light signals rather than
electrical signals. It is far more efficient than the other network transmission media.
· It can handle much higher bandwidth than copper. Due to the low attenuation, repeaters
are needed only about every 30 Km on fiber lines, versus about every 5 km for copper.
· Fiber is not affected by power surges, electromagnetic interference, or power failures.
Nor is it affected by corrosive chemicals in the air, making it ideal for factory
environments where electrical interference is very high.
· Fiber is lighter than copper. One thousand twisted pairs copper cables of 1 km long
weigh 800 kg. But fibers have only 100 kg.
· Fibers do not leak light and are quite difficult to tap. This gives them excellent security
against potential wire-tappers.
Comparison of optical fiber with twisted pair and coaxial cable
1.Capacity · Much higher bandwidth.
·Can carry hundreds of Gbps (Gigabit per second) over tens of Kilometers (kms).
2.Smaller size and lightweight: Very thin for similar data capacity.
·Much lighter and easy to support in terms of weight (structural properties).
3.Significantly lower attenuation
4.EM isolation (Resistance to noise).
·Not affected by external EM (Electromagnetic) fields.
·Not vulnerable to interference, impulse noise, or crosstalk.
·No energy radiation; little interference with other devices; security from eavesdropping.
5.Greater repeater spacing·Lower cost and fewer error sources.
6.Speed·Fiber optic networks operate at high speeds - up into the gigabits.
7.Distance·Signals can be transmitted further without needing to be "refreshed" or
strengthened.
8.Maintenance·Fiber optic cables costs much less to maintain.
It is more expensive than copper cable, but its costs are falling.
Question 2: [5]
What is the importance of twisting in twisted pair cable?
Answer:
They are twisted together for the purposes of canceling out electromagnetic interference
(EMI) from external sources; for instance, electromagnetic radiation from unshielded
twisted pair (UTP) cables, and crosstalk between neighboring pairs. Twisted pair wires
are twisted to minimize the electromagnetic interference between one pair and any other
pair in the bundle. Twisting also eliminates the undesired effect of one line on the
other which is called “ cross talk”. The advantage of twisting is that both wires are
equally affected by external influences. So the unwanted signals are canceled out. It
reduces the cross-sectional are exposed to magnetic fields, so reduces noise pickup on the
line.
Question 3: [5]
Is the transmission medium a part of physical layer? If yes state your reasons?
Answer:
The Physical Layer defines the means of transmitting raw bits rather than logical data
packets over a physical link connecting network nodes. The bit stream may be grouped
into code words or symbols and converted to a physical signal that is transmitted over a
hardware transmission medium. The Physical Layer provides an electrical, mechanical,
and procedural interface to the transmission medium. The shapes and properties of the
electrical connectors, the frequencies to broadcast on, the modulation scheme to use and
similar low-level parameters, are specified here.
Within the semantics of the OSI network architecture, the Physical Layer translates
logical communications requests from the Data Link Layer into hardware-specific
operations to affect transmission or reception of electronic signals. The transmission
medium is the physical path between transmitter and receiver in a data transmission
system. Though we can say that transmission medium defines the characteristics of the
interface between the source and the transmission medium and may not be the part of
physical layer.
The term transmission medium can also refer to the technical device which employs the
material substance to transmit or guide the waves. Thus an optical fiber or a copper cable
can be referred to as a transmission medium.
Coaxial Cable, one example of a transmission medium
Electromagnetic radiation can be transmitted through an optical media, such as optical
fiber, or through twisted pair wires, coaxial cable, or dielectric-slab waveguides. It may
also pass through any physical material which is transparent to the specific wavelength,
such as water, air, glass, or concrete. Sound is, by definition, the vibration of matter, so it
requires a physical medium for transmission, as does other kinds of mechanical waves
and heat energy. Historically, various ether theories were used in science and thought to
be necessary to explain the transmission medium. However, it is now known that
electromagnetic waves do not require a physical transmission medium, and so can travel
through the "vacuum" of free space. Regions of the insolative vacuum can become
conductive for electrical conduction through the presence of free electrons, holes, or ions.
Its Just an Idea Solution Plzzz Don’t Copy this

CS601 Assignment 3 Solution Spring 2011

thank a looot brothers
thanks a looot brothers
by combining the ideas of M Tariq, M imran & M Shafiq : we can make our assignment perfect

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