Westermo SD-300 - Manual (Page 12)

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6.4LED indicators
At power on the PWR immediatly lits and the other leds will run through a led test
sequence.
In the test sequence every led flashes twice, starting with SPD and ending with LINK
leds.
Indicators (LED) Power (PWR)
Link (LINK) of every port
Speed (SPD) and duplex (DPX) of TX ports
LED Status Indication of
PWR OFF No internal power (external power not connected)
ON Power OK
OFF Data in = 1, Mark,VTD < -3V.
ON Data in = 0, Space,VTD > +3V.
LINK OFF No Ethernet link
Cable not connected
ON Good Ethernet link
Flash Ethernet data is transmitted or received, traffic indication
SPD OFF 10 Mbit/s
(TX only) ON 100 Mbit/s
DPX OFF Half duplex
(TX only) ON ON Full duplex