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Reply To: BHCC and BHCA


I am T.N. Chaudhary from nepal telecommunication.Will you please kindly answer me of the following questions?
Q.(1)What is meant by tandem exchange?
Q2.Whatis the rang of ringing voltage& ringing current?
Q3.What are the basic component of UPS?
Q4.What is the frequency limit of optical fibre?
Q5.What is the range of voice frequency?
With Thanks looking forward the answer of above questions.