User`s guide

Troubleshooting 2-5
Table 2-1
Power LED Status Indicators
Power LED Definition
No light showing Power not applied
Steady Power LED Normal power-on indicator
Flashing Power LED
Switch failed POST and is not functioning,
although power is applied.
Front Panel LED Port Indicators
The color and flash speed of each port’s LED, as described in Table 2-2,
indicates the individual port’s status.
Table 2-2
Port LED Status Indicators
Port’s LED Status
No light showing
No light or signal carrier (no module, no cable) for
media interface LEDs
Steady yellow Receiving light or signal carrier, but not yet online
Slow yellow
Disabled (result of diagnostics or portDisable
command). Flashes every 2 seconds.
Fast yellow Error, fault with port. Flashes every 1/2 second.
Steady green Online (connected with external device over cable)
Slow green
Online, but segmented (loopback cable or
incompatible Switch) flashes every 2 seconds.
Fast green
Internal loopback (diagnostic). Flashes every 1/2
second.
Flickering green Online and frames flowing through port.