Description of the device
4.7 LED display
SCALANCE XM-400
36
Operating Instructions, 09/2018, C79000-G8976-C306-08
4.7.7
Port LEDs
The port LEDs "P1", "P2" etc. show information about the corresponding ports.
The meaning of the Port LEDs depends on the set display mode, see section "LEDs "DM1"
Meaning in display mode A
In display mode A, the port LEDs indicate whether a valid link exists.
LED color
LED status
Meaning
-
Off
No valid link to the port (for example communications
partner turned off or cable not connected).
Green
On
Link exists and port in normal status. In this status, the
port can receive and send data.
Flashes once per period* Link exists and port in "Blocking" status. In this status, the
port only receives management data (no user data).
Flashes three times per
period*
Link exists and port turned off by management. In this
status, no data is sent or received via the port.
Flashes four times per
period*
Link exists and is in the "Monitor Port" status. In this sta-
tus, the data traffic of another port is mirrored to this port.
Yellow
Flashing / lit
Receiving data at port
* 1 period
≙
2.5 seconds
Meaning in display mode B
In display mode B, the port LEDs indicate the transmission speed.
LED color
LED status
Meaning
-
Off
Port operating at 10 Mbps
Green
On
Port operating at 100 Mbps
Orange
On
Port operating at 1000 Mbps
Green
Flashing
Port operating at 10 Gbps
If there is a connection problem and the type of transmission is fixed (auto negotiation off),
the desired status, in other words the set transmission speed (1000 Mbps, 100 Mbps, 10
Mbps) continues to be displayed. If there is a connection problem and auto negotiation is
active, the port LED goes off.
Meaning in display mode C
In display mode C, the port LEDs indicate the mode.
LED color
LED status
Meaning
-
Off
Port operating in half duplex mode
Green
On
Port operating in full duplex mode
