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Explain FDM and show how CCITT standards help in building the base band?
Frequency Division Multiplexing: This is the process of combining some information channels through shifting their signals to various frequency groups in the spectrum therefore they can be transmitted simultaneously over common transmission service.
The bandwidth of a telephone speech signal is quite less than 4 kHz. Where, the available bandwidth on unloaded cables pair is fine above 100 kHz. Therefore this is possible, by using modulation techniques, for divide up the cable bandwidth then a number of telephone speech paths can be carried at the same time along a single cable pair. The normal arrangement contains 24 telephone channels per cable pair, the modulation in 24 channels being carried out within the two stages. In the primary stage, 12 channels are multiplexed together to form that is commonly termed as a basic group. This basic group arrangement is demonstrated in figure. Each of the 12 telephone signals are single side-band amplitude modulated on to carriers spaced at 4 kHz intervals 64 kHz to 108 kHz. The lower side-band (LSB) is utilized in every case. The 12 base-band signals are thus translated in the frequency band from 60 kHz 108 kHz as demonstrated. The block diagram for the channel translating equipment is specified in figure. To form a 24-channel system, to basic groups are occupied together. One basic group (B) is transmitted directly as this stands. Another basic group (A) is amplitude modulated on to a carrier are 120 kHz and the lower side-band is occupied such as to take the frequency range from 12 kHz to 60 kHz as demonstrated in figure. by using two stages of modulation for basic group A, this is possible to decrease the physical size of the component needed for the LSB filters of the figure, because the lowest cut- off frequency needed is at 64 kHz quite than 12 kHz when the whole block of 24 channels were assembled together in one stage of modulation.
FIG - Basic Group Arrangement
FIG - Channel Translating Equipment
HTML is a Hyper text Markup Language and it is Scripting Language
what shortcomings of smtp are over come by esmtp?
michelson-morley experiment-motivation and experimental setup
How is the command Suppress-Dialog useful? Suppressing whole screens is possible using this command. This command permits us to perform screen processing "in the background".
MP4 (MPEG-4) MPEG-4 files are in a format which can hold a mixture of multimedia objects like video, audio, animation, images etc. MP4 players again use compression technology
Explain Garbage collection In this method two passes are made over the memory to identify new areas. In the first pass it traverses all pointers pointing to allocated areas an
'On many systems, you can describe a function matherr which will be known as when there are certain floating-point errors, like errors in the math routines in .
Define thread cancellation & target thread. The thread cancellation is the task of terminating a thread before it has done. A thread that is to be cancelled is often referred
Q Convert the following DECIMAL numbers into HEXADECIMAL, double check by converting the result HEXADECIMAL to DECIMAL. a) 24 b) 547.56
What is Delay System? Delay System: A class of telecommunication networks like data a network that places the call or message arrivals in a queue in the lack of resources, an
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