Tripp Lite B127-1A1-DH Owner's Manual page 10

Standard Extender Installation
10. Turn on the power to the DisplayPort source. The (orange) LEDs on
the B127-002-D2H and B127-004-D4H will illuminate to indicate a
signal is received from the source. Additionally, the OUTPUT (orange)
LED will illuminate for each port signal connection.
11. The RJ45 (orange) LEDs on the B127-100-H will illuminate to
indicate a signal is being received from the extender/splitter. The
screen should now display on the connected monitor.
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