3com 09-0487-002 Manuale Utente

Removing modules from the hub with the power on will not damage the
hardware.  However, the software may not be able to distinguish between
intentional removal and catastrophic failure of a media module.  As a result,
some errors will be entered in the fault log and in some cases may fill the fault
log entirely.  The most common error resulting from the removal of a media
module is 05000002 (bus error).  Other errors may also occur.  Check the fault
log for valid errors before you remove any module.  Also, clear the fault log
(using the clear log command) after all changes are complete and the system has
been reinitialized.

The procedure for accessing the primitive console command mode has been
modified.  To access the primitive console command mode:

Press the RESET button once, or enter the reset command.

During the subsequent power-on self-test (POST), the status LED flashes
amber/green for 10 seconds, indicating that the primitive console command
mode is being accessed.

POST is reinitialized.  When POST is completed, this prompt appears for
10 seconds:

Press Ctrl-P to enter Primitive console

All other keys except [Ctrl] and [P] are ignored during this 10-second
interval.

The hub is now in the primitive console command mode.

If you do not access the primitive console command mode, POST executes the
system software resident in flash memory.  Prior to execution of the system
software, POST verifies that flash memory is not corrupted.  This process takes
about 20–30 seconds.  During this time the status LED is off.