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.
Lenz's law states: 'The direction of an induced e.m.f. is always like that it tends to set up a current opposing the motion or the change of flux responsible for inducing that
limitations and applications of following circuit theorems: telleans theorem superposition theorem norton theorem compensation theorem millman theorem reciprocity theorem maximum p
What is the function of the signal in 8086? BHE signal means Bus High Enable signal. The BHE signal is made low when there is some read or write operation is carried out. i.e.
Q . Why CE Configuration is widely used in amplifier circuit? The main utility of a transistor lies in its ability to amplify weak signals. The transistor alone cannot perform
Design a recycling MOD 19 up counter using JK FFs. In your design, include the logic circuit diagram and the timing diagram output that counts from 000002 = 010 to 100112 = 1910. C
Q. How time slot interchange switch works in time multiplexed time switching, Elucidate using schematic. Ans: Switches for which inlets and outlets are trunks that carry tim
Abalanced three-phase, 60-Hz voltage is applied to a three-phase, two-pole induction motor. Corresponding to a per-unit slip of 0.05, determine the following: (a) The speed of t
Charging of the capacitor: Considering the below diagram, with slight approximation the ripple voltage can be supposed as triangular. To the cut-out point from the cut-in poin
truth table of decimal to seven segment
Long-Term Plans for Technical Loss Reduction Long-term measures for technical loss reduction include all measures that require to be taken for the improvement of quality and r
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