3Com 2848 SFP User Guide - Page 16
Supplying Power to the Switch, Checking for Correct Operation - fail safe
UPC - 662705502243
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16 INSTALLING THE SWITCH If you are placing Switch units one on top of the other, you must use the self-adhesive rubber pads supplied. Apply the pads to the underside of each Switch, sticking one in the marked area at each corner. Place the Switch units on top of each other, ensuring that the pads of the upper unit line up with the recesses of the lower unit. Supplying Power to the Switch Power problems can be the cause of serious failures and downtime in your network. Ensure that the power input to your system is clean and free from sags and surges to avoid unforeseen network outages. 3Com recommends that you install power conditioning, especially in areas prone to blackout, power dips and electrical storms. The unit is intended to be grounded. Ensure it is connected to earth ground during normal use. Installing proper grounding helps to avoid damage from lightning and power surges. Before powering on the Switch, verify that the network cables and the power cable are securely connected. CAUTION: The Switch has no ON/OFF switch. The only way to power on and power off the Switch is by connecting and disconnecting the power cord. This is called "power cycling". To power on the Switch: 1 Plug the power cord into the power socket on the rear panel of the Switch. Refer to "(8) Power Socket" on page 11 for more information. 2 Plug the other end of the power cord into a power outlet. When the Switch is powered on, the Power LED lights up. If the Power LED does not light up, refer to "(6) Power LED" on page 10 for more information. Checking for Correct Operation After you power on the Switch, it automatically performs a power-on self-test (POST). During POST, the Power LED on the front panel of the Switch flashes green. When POST is complete, the Power LED turns green. If the Power LED turns yellow after POST, it means that POST failed and the Switch has entered fail-safe mode. The following summarizes the possible colors for the Power LED after POST. Status Meaning Green The unit is powered on and ready to use. Yellow Power-on self-test or loopback test failed. The Switch is in fail-safe mode. This can happen if a port or ports fail when the Switch was powered on.