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.
derive relation for hybriod pera meters
Define johnson counter to Convert Serial Data to Parallel Data? A microprocessor-based or computer system commonly requires incoming data to be in parallel format. But often t
please, how do i design a linear phase stable recursive digital filter
history of engineering economices
Four voicemessages, each with 3-kHz bandwidth, are to be sampled at Nyquist rate, and time- multiplexed with samples taken at twice the Nyquist rate from six analog monitoring sign
block diagram of ammeter and element defanition
Management of Initiatives and Focus - KPI In this era of fierce competition and to have the competitive edge, it is significant to conserve the material and human resources th
Q. An RG-139/U rectangular waveguide is given to have dimensions a = 0.8636 mm and b = 0.4318 mm. Compute the theoretical and practical frequency ranges of operation for the guide.
Q. A 60-Hz, six-pole, wye-connected, three-phase induction motor, with the parameters R 1 = R 2 = 0.025 and Xl 1 = Xl 2 = 0.125 , is controlled by variable-frequency control
Devise a "green" design to improve the electrical plan of a room in your home. How might you reduce electricity use in your home. Initiate and plan 1. Select two rooms in y
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