Siemens SCALANCE M800 Operating Instructions Manual page 24

Description of the device
2.4 LED display
LED
L
SC
Q
P1/P2
24
Status Meaning
OFF Device turned off, no power supply.
ON Device turned on, power supply present.
OFF SIM card OK, no connection.
ON Wrong PIN number / SIM card error
ON Connection established
OFF No reception
Signal strength: < -109 dBm
Flashing Signal strength bad: -89 dBm to -109 dBm
On Signal strength medium: -73 dBm to -89 dBm
ON Signal strength good: > -73 dBm
OFF No VPN connection is established.
ON All configured VPN connections are established.
Flashing Only some of the configured VPN connections are established.
OFF Ethernet connection to local computer or LAN not established
ON Ethernet connection to local computer or LAN established
ON Device receiving / sending data
Operating Instructions, 08/2018, C79000-G8976-C331-08
SCALANCE M874, M876