Connecting A Redundant Power System; Choosing The Correct Cables - 3Com SuperStack 3 Switch 4300 Getting Started Manual

Connecting a
Redundant Power
System
Choosing the Correct
Cables
Power and POST (Self Test) LEDs
Table 7
LED Color
Power Green
Off
POST Yellow
Off
If there is evidence of a problem, see
LEDs" on page 24.
You can connect a SuperStack 3 Advanced Redundant Power System
(3C16071B) 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 2A Power Module
(part number 3C16074A). For full redundancy, the unit requires two type
2A Power Modules combined using a Type 2 Y-Cable.
WARNING: The Switch has no ON/OFF switch; the only method of
connecting or disconnecting mains power is by connecting or
disconnecting the power cord.
CAUTION: The Switch can only use a SuperStack Advanced Redundant
Power System output.
All of the ports on the front of the Switch 4300 are Auto-MDIX, that is
they have a cross-over capability. The port can automatically detect
whether it needs to operate in MDI or MDIX mode. Therefore you can
make a connection to a port with a straight-through (MDI) or a cross-over
cable (MDIX).
3Com recommends that you use Category 5 twisted pair cable — the
maximum segment length for this type of cable is 100 m (328 ft).
The Power-up Sequence
State
The Switch is powered-up and
operating normally.
The Switch is not receiving power.
The Switch has failed its Power On Self
Test. This occurs if any of the ports fail
during power-up.
The Switch has completed its Power On
Self Test.
"Solving Problems Indicated by
23