Checking For Correct Operation Of Leds; Connecting A Redundant Power System - 3Com SuperStack 3 4900 SX Getting Started Manual

Checking for Correct
Operation of LEDs
Connecting a
Redundant Power
System
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/Self Test LED to make
sure that your Switch is operating correctly.
for the LED.
Table 7 Power/Self Test LED Colors
Color State
Green The Switch is powered-up and operating normally.
Yellow The Switch has failed its Power On Self Test. This occurs if any of
the ports fail during power-up.
Off The Switch is not receiving power.
If there is evidence of a problem, see
LEDs"on page 22.
You can connect a SuperStack 3 Advanced Redundant Power System to
the Switch. This unit, which is also known as an RPS, is designed to
maintain the power to your Switch if a power supply failure occurs.
For normal redundancy, the unit requires one Type 3 Power Module (part
number 3C16075).
For full redundancy, the unit requires two Type 3 Power Modules
combined using a Type 3 Y-Cable (part number 3C16077).
WARNING: If you are connecting the Switch 4900 SX to a Type 3 Power
Module, read the Safety information section in the Type 3 Power Module
User Guide.
CAUTION: The Switch can only use a SuperStack Advanced Redundant
Power System output.
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.
The Power-up Sequence
Table 7 shows possible colors
"Checking for Correct Operation of
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