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STDM, T-1 lines, TDM and FDM

How does STDM yield more efficient use of the bandwidth?

How many T-1 lines are needed to make up one OC12 line ? Need to see the calculated out to understand this

Explain the differences between TDM and FDM?

Hi I have these topics I am trying to understand further please help.
thanks

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How does STDM yield more efficient use of the bandwidth?

How many T-1 lines are needed to make up one OC12 line ? Need to see the calculated out to understand this

Explain the differences between TDM and FDM?

Hi I have these topics I am trying to understand further please help.
thanks

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