A company  PBX  via a  T1  connection line to the telephone network operators, due to expansion of company size, needs to be able to meet the concurrent  50  -way voice calls, you need to re-apply for  ____  root  T1  line  ?  ( Fill in Arabic numerals )

A company  PBX  via a  T1  connection line to the telephone network operators, due to expansion of company size, needs to be able to meet the concurrent  50  -way voice calls, you need to re-apply for  ____  root  T1  line  ?  ( Fill in Arabic numerals )
A . 2

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Answer:   A

Explanation:

T1  is  1.5M  ,  50  voice channels need  50*56K=2800K  bandwidth