Several users from the same building are reporting connectivity issues. The SFP at that building’s IDF switch is showing a link light, but there is no link light to the corresponding switch’s SFP at the MDF. Which of the following is the MOST likely cause?
A.
A crossover cable is being used.
B.
DB loss is too high on all strands.
C.
Only TX or RX strand is working.
D.
TX and RX are reversed.