Question

A Time Division Multiplexer combines four 100-Kbps channels employing a time slot of 2 bits. Input on channel 1=01010101. Input on channel 2=10101010, Input on channel 3=00110011 and input on channel 4=11001100 

a) With aid of an illustration and using TDM principles show the input messages along the input channels and output massages along the output channel, (insert MUX) 

b) Determine frame rate and frame duration  

c) Determine bit rate and bit duration look  

d) Explain the cause of quantization noise

Answer 1

Time Division Multiplexing(TDM) : Time-Division Multiplex (TDM) is a technique of transmitting multiple digitized data simultaneously over one communication medium, such as wires etc. and in which pulses representes the bits from different time slots.

(d) Quantization Noise: "The Quantization process introduces an error defined as the difference between the input signal, x(t) and the output signal, y(t). This error is called the Quantization Noise.”(Definition)

Cause of Quantization Noise : Quantization noise is produced in the transmitter end of a system by rounding off sample values of an analog base-band signal to the nearest permissible representation levels of the quantizer. As such quantization noise differs from channel noise in that it is signal dependent.

SURYA Gold Page Awet TOM: Time Division Multiplening (Tom) is a method of transmitting and rewwing independent Signals. over a common signal path with the help of switch 100 Kbps To 5625 lookbps 100 kbps Too Kbps In our question all channels are of 100 kbps is they are not game then we need to take the macinum af them as our channel output. eg: 180 kbps - 180 kbps i 160 Kbps - we need to add bits in and channels hriven that we are taking e bits from each channels (time slat=2) Hence, frame = 2xy = 8 bits Frame Rate - 100.000 - 50,000 free I Each frame carries 2-bits from 100 Kbps channel

Frame Duration Ls = 1 Frame - 50,000 Rate ol 20 us (c) Bit Rate = carties tan 50,000 x 8 400,000 - 400 Kbps 8 bit = Bit Duration = Bit Rate - 2.5 us 400,000