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Select Switches are equipped with Unit LEDs to enable you to determine the status of the
Switch, as well as Port LEDs to display what is happening in all your connections. SFP
interface LED is applicable to select Switches with SFP port(s).
They are as follows:

System LEDs

PWRIlluminate: Primary Power On
OFF: Primary Power off or Failure
RPSIlluminate: Redundant (secondary) Power on
OFF: Redundant Power off or failure
ALMIlluminate: Alarm for following conditions(when the
DIP switches are turned on)
✓ Primary Power lost
✓ Secondary Power lost
OFF: Normal operation

Interface LED

SFPIlluminated: Ethernet link-up
Blinking: Activity (receiving or transmitting data)
OFF: Port disconnected or link failed

Port Number LED

1000Illuminated: Link speed at 1000Mbps
OFF: Link speed at 10/100Mbps
LNK/ACTIlluminated: Ethernet link-up
Blinking: Activity (receiving or transmitting data)
OFF: Port disconnected or link failed

Notice:
✓ PWR: Primary Power
✓ RPS: Redundant Power Supply
✓ ALM: Alarm