Which device is used by a technician needing to check a voice line, commonly by connecting directly into the line at a distribution point?
A) BERT
B) Toner
C) Butt set
D) TDR
C
Explanation: A butt set is a used by technicians to test voice lines; this is typically done my tapping into the line at a distribution point (for instance, IDF, MDF, pole).
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