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
What is cache memory? It is a small, fast memory that is inserted among large, slower main memory and the processor. It decreases the memory access time
What are the different storage classes in C? Storage classes in C There are four storage classes in C: a. Automatic storage class: b. Register storage class: c
It takes away two constraints which were holding back Web developments: 1. Dependence on a one, inflexible document type (HTML) which was being much abused for tasks it was neve
Can math operations be performed on a void pointer? No. Pointer addition and subtraction are based on advancing the pointer by a number of elements. By explanation, if you have
Name the 7400 series TTL chip which is a priority encoder. Write its truth table. Ans. Available IC in 74 series is 74147 that is a priority encoder. Such I
Q. Disk operating system? The operating system (OS) is the first program that should be loaded into the memory of your PC before you can use it for any application. You can st
What is Collation Collation refers to a set of rules that verify how data is sorted and compared. Character data is sorted using rules that explain the correct character se
Define the term Electronic Cheques in briefly. The other mechanism for Internet payment is electronic cheques. Along with electronic cheques, there payer (either a business or
How different are interface and abstract class in .Net? Abstract classes cannot be instantiated it can have or can't have abstract method basically known as must inherit as th
The first part of the address in electronic mailbox identifies? The first part of address in E-Mail identifies the user's mail box.
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