3Com 3CR17451-91 Power-up, Sequence, Powered-up and ready for operation, Switch, Color State

The Power-up Sequence 23

The Power-up	The following sections describe how to get your Switch 3870
Sequence	powered-up and ready for operation.

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

Switch 3870

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

2Plug 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 1 minute.

Checking for Correct During the Power On Self Test, all ports on the Switch are disabled and Operation of LEDs the LEDs light in a rapid sequence.

When the POST has completed, check the Unit Status to make sure that your Switch is operating correctly. Table 7 shows possible colors for the LED.

Table 7 Unit Status Colors

Color	State
Green	The Switch is powered-up and operating normally.
Yellow	The Switch has failed its Power On Self Test (POST).
Off	The Switch is not receiving power.

If there is evidence of a problem, see “Solving Problems Indicated by

LEDs” on page 46 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.

Connecting a You can connect a SuperStack 3 Advance Redundant Power System to Redundant Power the Switch. This unit, which is also known as RPS, is designed to maintain

Supply the power to your Switch if a power supply failure occurs.

For normal redundancy, the unit requires a Type 3 Power Module (part number 3C16075)