Be sure to match the center pair (pins 4 & 5) of the IPC with the correct corresponding pair on the RPF enabled switch. A mismatch in the connection may still enable the reverse power feed but the data link will remain down. Also, ensure there are no disconnects on the center pair. A stable link on the outer pair, but a disconnect on the center pair will cause the data link to fluctuate or disconnect while the RPF links stays up.
