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
Q. How to load DOS from Floppy Disk? If DOS is not setup on the Hard Disk of your PC, or you want to load DOS from the Floppy disk drive due to any reason, follow these steps:
Role of Internet, Intranet and extranet in e-business The following information activities are carried out in many business: 1. Selling of raw materials 2. Advertising o
complete notes
A desirable choice for the partitioning element in quick sort is First element of the list.
Interconnection Network Introduction This unit discusses the types and properties of interconnection networks. In multiprocessor systems, there are multiple I/O modules
Network for Digital Methods in the Arts and Humanities: Europe has seen a signifi cant investment in the digitisation of its cultural heritage as part of the worldwide establi
Describe the term- Macros A macro is a key or name which signifies a series of commands or key strokes. Many applications allow single nominated key or single word on a keyboar
diifference between pure and impure interpeter
Connectives in first-order logic sentences - Artificial intelligence We may string predicates together into a sentence in the same way by utilising connectives that we did for
The chief reason why digital computers use complemented subtraction is that it ? Ans. By using complemented subtraction method negative numbers can easily be subtracted.
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