
Interfaces, Displays and Operator Controls
Industrial Ethernet OSM/ESM
C79000-Z8976-C068-04
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4.2.3 Port LEDs
The port LEDs indicate the operating states of the individual ports of the OSM/ESM.
The display mode of the port LEDs can be changed using the button on the front panel
of the OSM/ESM allowing all operating states to be displayed. The current display
mode is signaled by the two display mode LEDs.
Display mode Meaning
Port Status Port LED
- Not lit: No valid connection to the port (for
example station turned off or cable not
connected)
- Lit green: Valid connection
- Flashes green (once per period): Port
switched to standby
- Flashes green (twice per period): Port is
segmented
- Flashes green (three times per period): Port
is turned off
- Flashes/lit yellow: Data reception on this
port
100 Mbps
Port LED
- Lit green: Port operating at 100 Mbps
- Not lit: Port operating at 10 Mbps
Full duplex
Port LED
- Lit green: Port operating in full duplex mode
- Not lit: Port operating in half duplex mode
LED off
ED off
Display
LED off LED on
Display
LED on LED off
Display
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