Which of the following is equipment provided by the telephone company that provides remotediagnostic and loopback services for subscriber lines?() A. 66 blockB. DemarcC. Smart jackD. 110 block
Which of the following is equipment provided by the telephone company that provides remotediagnostic and loopback services for subscriber lines?()
A. 66 block
B. Demarc
C. Smart jack
D. 110 block
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