3Com Switch 4500 Family, Getting Started Manual, Page: 35 / 134

The Power-up Sequence 35
The Power-up
Sequence
The following sections describe how to get your Switch 4500
powered-up and ready for operation.
Powering-up the
Switch 4500
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.
Checking for Correct
Operation of LEDs
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.
CAUTION: The Switch has no ON/OFF switch; the only method of
connecting or disconnecting mains power is by connecting or
disconnecting the power cord.
Choosing the Correct
Cables
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).
Color State
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.