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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
Place some text wherever. Then click "Create path from text" in the "Text tool option" window. Then use "Edit" -> "Stroke path" and choose the appropriate options in the following
Define a B tree of order m. B Tree of order m A balanced multiway search tree of order m in which every non root node having at least m/2 keys is known as a B-Tree of order
Visual basic applications have very rich and flexible applications but there is single limitation when using pointer function. Windows API has limited support for function pointers
Explain about the term RTL Fix. RTL Fix: An RTL fix implies you change the Verilog/VHDL code and you resynthesize. This generally means a new Plance and Route. RTL fixes wou
List the major components of the keyboard/Display interface. a. Keyboard section b. CPU interface section c. Display section d. Scan section
A Scrollbar is a Component, but not a Container while Scrollpane is a Container and handles its own events and do its own scrolling.
Calculate the blocking probably Pb in 100 line strowger switching system where 10 calls are in progress and 11th one arrives, probably that there is a call in a given decade = 1/10
quick sort working
Explain about the Client/Server Computing? Although there are different various configurations, various hardware and software platforms and even various network protocols into
Explain the use of structures with pointers C permits a pointer to a structure variable. In fact a pointer to a structure is same to a pointer to any other variable. The pointe
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