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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
Explain architecture of World Wide Web with the basic entities. The architecture of the World Wide Web, demonstrated below, is the one of clients, as like Netscape, Lynx or Int
The constructed datatype of C is known as Structure is a constructed datatype of C.
Driver software is software that works as a translator among another program and some piece of hardware. In the software industry, there are commonly standard ways to do things. Th
Associative Array Processing Consider that a list of record or a table is stored in the memory and you want to search some information in that list. For example, the list havin
MINI PROJECT ON UNIVERSITY SCHEMA
Question 1: a) How do you track down a transition by name? b) Why Premiere Pro is considered a non-linear editor? c) Explain clearly the main problem that may arise wh
Create a class called auditorium that specifies the seats in the auditorium. The class should include at least one data item: seat (two dimensional array of Char) and at least thre
1. URL Pattern - You can contain placeholders in a URL pattern so that variable data can be passed to the request handler without having a query string. 2. Handler - The handle
Give some technical specification for subscriber lines. Subscriber pairs and exchange pairs are interconnected at the MDF through jumpers. The MDF therefore gives a flexible in
Whenever we compile with -g option, it will make a symbol table, and according that table for every function and line it will call ptrace.
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