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!
How speech is transmitted in a digital switching environment using PCM/TDM?
A digital carrier system is a communications system which uses digital pulses quite than analogue signals to encode information. Figure demonstrates the block diagram for a digital carrier system. Such digital carrier system T1 uses PCM-encoded samples by 24 voice band channels for transmission over optical fibre transmission line or a single metallic wire pair. All voice-band channels have a band width of around from 300 Hz to 3000 Hz. Again, the multiplexer is only a digital switch with 24 independent inputs and one time division multiplexed output. The output signals of PCM by the 24 voice-band channels are sequentially selected and linked through the multiplexer to the transmission line.
Whenever a T1 carrier system, D-type (digital) channel banks perform the encoding, sampling and multiplexing of 24 voice-band channels, all channels has an eight-bit PCM code and is sampled 8000 times a second. All channels are sampled at similar rate. Figure illustrates the channel sampling sequence for a 24-channel T1 digital carrier system. As the figure shows all channel is sampled once each frame but not at similar time. Each channel's sample is offset from the previous channel's sample through 1/24 of the total frame time. Hence, one 64-kbps PCM-encoded sample is transmitted for each voice-band channel throughout all frames (a frame time of 1/8000 = 125 µs). Afterwards, an additional bit (termed as the framing bit) is added to all frames.
The framing bit happens once per frame (8000-bps rate) and is recovered into the receiver, where this is used to keep frame and sample synchronization among the TDM transmitter and receiver.
FIG - Two-channel PCM-TDM system
What is Static timing a. Delays over all paths are added up. b. All possibilities, including false paths, verified without the need for test vectors. c. Faster than simul
What is an Abstract Data Type (ADT)? Abstract data types or ADTs are a mathematical specification of a set of data and the set of operations that can be done on the data. They
What are the "field" and "chain" Statements? The FIELD and CHAIN flow logic statements let you Program your own checks. FIELD and CHAIN tell the system which fields you are ch
a. List the ACID properties. Describe the usefulness of each. b. During its implementation, a transaction passes by several states, until it finally commits or aborts. List all
Differentiate between asynchronous and synchronous types of serial communication. Serial data communication uses two fundamental types, asynchronous andsynchronous. With synchr
Mutation: However it may appear that the above recombinations are a little arbitrary that especially as points defining whether crossover and inversion occur are chosen random
Q. Explain Extended Binary Coded Decimal Interchange Code? Extended Binary Coded Decimal Interchange Code (EBCDIC) is a character-encoding format employed by IBM mainframes. It
Control-Centered Virtual Manufacturing This is the addition of simulations to control actual processes and models, permitting for seamless simulation for optimization throughou
Program generation activity aims at? Ans. At automatic generation of program the program generation activity aims.
Q. What do you mean by artificial intelligence? Show the artificial intelligence systems used widely in business. ANSWER: Artificial intelligence (AI) is the science of making
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