Dell PowerVault 50F Installation And Troubleshooting Manual page 101

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%  &"    
No light showing Power not applied.
Steady power LED Normal power-on indicator.
Flashing power Switch failed POST and is not functioning, although power is
LED applied.
The color and flash speed of each port's LED, as described in Table 5-2, indicates the
individual port's 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 device over cable)
Slow green Flashes every 2 seconds; interswitch link; the port is physi-
cally online, but the fabric remains segmented due to an
incompatable switch or switch firmware
Fast green Internal loopback (diagnostic); flashes every 1/2 second
Flickering green Online and frames flowing through port
At power-on or reset, the following steps are executed:
1. Preliminary POST diagnostics.
2. VxWorks operating system initialization.
3. Hardware initialization (resets, internal addresses assigned to G_Port and FL_Port
ASICs, serial port initialized, front panel initialized).
4. Full POST.
5. Universal port configuration.
6. Link initialization; receiver/transmitter negotiation to bring connected ports online.
Troubleshooting 5-3