3com family 4500 User Manual

The following sections describe how to get your Switch 4500 
powered-up and ready for operation.

Use the following sequence of steps to power-up the Switch.

1 Plug the power cord into the power socket at the rear of the Switch.

2 Plug the other end of the power cord into your power outlet.

The Switch powers-up and runs through its Power On Self Test (POST), 
which takes approximately one minute.

During the Power On Self Test, all ports on the Switch are disabled and 
the LEDs light. The PWR LED will flash green during the POST.

When the POST has completed, check the PWR LED to make sure that 
your Switch is operating correctly. Table 12 shows possible colors for the 
LED. 

Table 12   Unit Status Colors

If there is evidence of a problem, see “Solving Problems Indicated by 
LEDs” on page 70 for a list of suggested solutions.

All of the ports on the Switch are Auto-MDIX, that is they have a 
cross-over capability. These ports can automatically detect whether to 
operate in MDI or MDIX mode. Therefore you can make a connection to 
one of the ports with a straight-through (MDI) or a cross-over cable 
(MDIX).

Green

The Switch is powered-up and operating normally.

Green flashing

Self Test (POST) or Software Download is in progress

Red

The Switch has failed its Power On Self Test (POST).

Off

The Switch is not receiving power.