Download Computer Network by S.S. Shinde PDF

By S.S. Shinde

This publication offers with easy necessities of conversation wanted for machine Networking and exact bottom-up method of OSI layers. This publication is extra specific and analytical than the other introductory machine Networking texts. This publication could function a whole textual content for all undergraduate scholars of BCA, BCS, B.Sc.(Computer), measure direction in Electronics & Telecommunication, info know-how, laptop technology & Engineering of varied Technical Universities. it's going to even be beneficial to practitioners within the telecommunications undefined.

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Particularly noise can be divided into two subgroups. 1. External Noise. 2. Internal Noise. 1. External Noise The noise which is created or caused outside the communication or receiver system is called an external noise. External noises are somewhat uncontrollable and these are, (a) Atmospheric noise. (b) Extra-terrestrial/space noise. (c) Man-made or individual noise. (a) Atmospheric Noise It is caused by lighting discharge in thunderstorm and other natural disturbance in atmosphere. These noise impulse are electric in nature and spread over the complete frequency spectrum which is used for radio communication.

The bandwidth required for an FM system can be calculated after referring to the Bessel function tables and deciding which is the highest J term to be included for a particular modulation index. A rough approximation of required sideband is the sum of deviation plus highest modulating frequency. The bandwidth then becomes this number doubled. 1. FM broadcast standards specify a maximum deviation of 75 kHz and a maximum modulating frequency of 15 kHz. This equates to an mf of 75/15 or 5. 8 The frequency components of an FM signal extend to infinity on either side of the carrier frequency.

The amplitude of the carrier wave is varied in accordance with the signal to be sent. Amplitude modulated wave is made up of a number of sinusoidal components having a specific relation to one another. Here the amplitude of a carrier signal is varied by the modulating signal, whose frequency is invariably lower than that of the carrier. Fig. 1 Basic amplitude modulation waveforms 18 COMPUTER NETWORK In practice, the carrier may be high frequency (HF), while the modulation is audio 1. Let the carrier signal and the modulating signal ac and am respectively be as, ac = Ac sin (ωct + θc) am = Am sin (ωmt + θm) Note that phase angle has been ignored in both expressions, since it is unchanged by the amplitude modulation process.

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