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!
Q. How speech is transmitted in digital switching environment by using PCM/TDM?
Ans:
A digital carrier system is a communications system which uses digital pulses instead of analogue signals to encode information. Figureshows the block diagram for a digital carrier system. This digital carrier system T1 employs PCM-encoded samples from 24 voice band channels for transmission over an optical fibre transmission line or single metallic wire pair. Every voice-band channel has a band width of about 300 Hz to 3000 Hz. Again, multiplexer is simply a digital switch with 24 independent inputs and one time division multiplexed output. PCM output signals from 24 voice-band channels are sequentially selected and connected through multiplexer to transmission line.
When a T1 carrier system, D-type (digital) channel banks perform sampling, multiplexing and encoding of 24 voice-band channels, every channel comprise an eight-bit PCM code and is sampled 8000 times a second. Every channel is sampled at the same rate. Figuredemonstrates the channel sampling sequence for a 24-channel T1 digital carrier system. As the Figureillustrates each channel is sampled once each frame though not at the same instance. Every channel's sample is offset from previous channel's sample by 1/24 of the total frame time. Hence one 64-kbps PCM-encoded sample is transmitted for every voice-band channel during each frame (a frame time of 1/8000 = 125 µs). Afterwards, an extra bit (known as the framing bit) is added to every frame. Framing bit occurs once per frame (8000-bps rate) and is recovered in the receiver, where it's used to maintain frame and sample synchronization between TDM receiver andtransmitter.
Q. Explain Source encoding or data compression? The sequence of binary digits from the source encoder, known as the information sequence, is passed on to the channel encoder. T
Q. Describe in detail the construction and working of analog type storage oscilloscope. Explain the principle of secondary emission. Analog Storage Oscilloscopes: Storage o
analysis and detail working of bootstrap sweep circuit
Calculate total resistance among terminal A and B for the circuit below.
1. Write the Boolean expression and draw the gate logic diagram and typical PLC ladder logic diagram for a control system wherein a fan is to run only when all of the following con
Stratos Corporation is a privately held tablet semiconductor technology firm with bright growth prospects.The past 5 years have seen the firm evolve from a pure startup to a profit
commutator in d.c machine acts as... what????
power factor use
SUI Subtract Immediate I Instructions The 8 bit data specified in the instruction is directly subtracted from the contents of accumulator and results of operation
Define Hysteresis Hysteresis is the 'lagging' effect of flux density B whenever there are changes in the magnetic field strength H. When an initially unmagnetized ferromagnetic
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: +1-415-670-9521
Phone: +1-415-670-9521
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd