Communication Systems
Which of the following does not cause losses in optical fibre cables?

Impurities
Attenuation in glass
Microbending
Stepped index operation

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Communication Systems
In Pulse Code Modulation system

Quantising noise can be overcome by companding
Quantising noise can be reduced by decreasing the number of standard levels
Suffers from the disadvantage of its incompatibly with TDM
Large bandwidth is required

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