Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
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
E-commerce advance tremendous chance by permitting industrialist to buy Materials at a low price internationally. Also they give companies the opportunity to sell to universal stor
With neat diagrams explains the configuration of a step-by-step switching system. The schematic diagram for an exchange is specified in figure. Each subscriber is associated to
What is reentrant tasks and functions Tasks and functions without optional keyword automatic are static , with all declared items being statically allocated. These items will b
Explain the application of E-Commerce in Home Banking. Home Banking: E-commerce is employed in Home Banking like one call or one click. Internet banking or online bank
What are the different phases of consumer mercantile model? There are three different phase of consumer mercantile model like listed as in below: • Pre-purchase interaction
Question 1: (a) Describe the two fundamental characteristics of antennas explaining in detail how it affects the security of wireless networks. (b) What is a wireless cli
Write a PERL script which takes a file named input.txt as an input and processes it. The input file has the following format: firstname lastname: pass/fail score%. A sample input f
How can a parent and child process communicate? A parent and child can communicate by any of the normal inter-process communication schemes (pipes, sockets, message queues, sha
Q. Compatibility of Sound cards? Compatibility: Sound cards should be compatible at both software and hardware levels with industry standards. Most software particularly gam
Q. What is Hard Drive Interface? Secondary storage devices need a controller to proceed as an intermediary between device and rest of the computer system. On some computers the
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd