21
Power Status LEDs
The switch can operate with one or two DC power sources. Each DC input has an associated LED that shows the status
of the corresponding DC input. If power is present on the circuit, the LED is green. If power is not present, the LED color
depends on the alarm configuration. If alarms are configured, the LED is red when power is not present; otherwise, the
LED is off.
If the switch has dual power sources, the switch draws power from the power source with the higher voltage. If one of
the DC sources fails, the alternate DC source powers the switch, and the corresponding power status LED is green. The
power status for the failed DC source is either off or red, depending on the alarm configuration.
The Power A and Power B LEDs show that power is not present on the switch if the power input drops below the low
valid level. The power status LEDs only show that power is present if the voltage at the switch input exceeds the valid
level.
For information about the power LED colors during the boot fast sequence, see the
Verifying Switch Operation, page 71
Port Status LEDs
Each port and SFP uplink slot has a status LED, as shown in
.
Dual-Purpose Port LEDs
shows the LEDs on a dual-purpose port. The LEDs show how the port is being used (Ethernet or
SFP module). The LED colors have the same meanings as for the
.
Table 8
Power Status LEDs
Color
System Status
Green
Power is present on the associated circuit, system is operating normally.
Off
Power is not present on the circuit, or the system is not powered up.
Red
Power is not present on the associated circuit, and the power supply alarm is
configured.
Table 9
Port Status LEDs
Color
System Status
Off
No link.
Solid green
Link present.
Blinking green
Activity. Port is sending or receiving data.
Alternating green-amber
Link fault. Error frames can affect connectivity, and errors such as excessive collisions,
CRC errors, and alignment and jabber errors are monitored for a link-fault indication.
Solid amber
Port is not forwarding. The port was disabled by management, an address violation, or STP.
Note:
After a port is reconfigured, the port LED can remain amber for up to 30 seconds
while STP checks the switch for possible loops.
