3Com 3CR17450-91, Getting Started Manual

Page: 26 / 86

24 C
HAPTER
2: I
NSTALLING THE
S
WITCH
The Switch is intended to be grounded. Ensure it is connected to earth
ground during normal use. Installing proper grounding helps 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 at the rear of the Switch.
2 Plug the other end of the power cord into a power outlet.
When the Switch is powered on, it 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 in a rapid sequence.
When the POST has completed, check the Power LED to make sure that
your Switch is operating correctly. Table 7 shows possible colors for the
LED.
Table 7 Power LED Colors
If there is evidence of a problem, see “Solving Problems Indicated by
LEDs” on page 50 for a list of suggested solutions.
Connecting a
Redundant Power
Supply
You can connect a SuperStack 3 Advanced Redundant Power System to
the Switch. This unit, which is also known as RPS, is designed to maintain
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).
Color State
Green The Switch is powered on and operating normally.
Yellow The Switch has failed its Power On Self Test (POST).
Off The Switch is not receiving power.