ESR Series Routers Operation Manual                                                          19 
Data reception in progress 
Data transfer in progress 
 
The following table lists description of system indicator statuses and meanings. 
Table 2.16 —Status of system indicators 
Current device status indicator. 
Device is in normal operation state. 
Device is booting up the software. 
Device alarm presence and level 
indicator.
 
 
Active VPN sessions indicator.
 
 
Data storage activity indicator: SD 
card or USB Flash. 
Read/write operation execution with 
'copy' command 
Device power is OK. Main power 
supply, if installed, is operational. 
Main power supply failure or fault, or 
the primary main is missing. 
Device internal power supply failure. 
Device failover mode operation 
indicator.
 
All fans are operational.  
One or more fans has failed. Possible 
cause of failure: at least one of the fans 
has stopped or is working at lower 
rpm. 
Backup power supply operation 
mode. 
 
 
Backup power supply is installed and 
operational. 
Backup power supply is not installed. 
Backup power supply is missing or 
failed. 
2.4.3.2 ESR-100/ESR-200 light indication 
Gigabit Ethernet copper interface and SFP interface  statuses are represented by two LEDs—green 
LINK/ACT LED and amber SPEED LED. Location of the copper interface LEDs is depicted in Fig. 2.11. SFP 
interface status is depicted in Fig. 2.13. For light indication meaning, see Table 2.17. 
 
Fig. 2.13 —Location of optical interface indicators