3com 4900 sx Guia De Configuração Rápida
The Power-up Sequence
21
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.
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.
sure that your Switch is operating correctly.
shows possible colors
for the LED.
Table 7 Power/Self Test LED Colors
If there is evidence of a problem, see
Connecting a
Redundant Power
System
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.
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).
number 3C16075).
For full redundancy, the unit requires two Type 3 Power Modules
combined using a Type 3 Y-Cable (part number 3C16077).
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.
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.
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.
connecting or disconnecting mains power is by connecting or
disconnecting the power cord.
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.
the ports fail during power-up.
Off
The Switch is not receiving power.
17702ua.bk Page 21 Friday, April 6, 2001 3:31 PM