Connecting A Redundant Power System; Choosing The Correct Cables - 3Com SUPERSTACK 4226T Getting Started Manual

Connecting a
Redundant Power
System
Choosing the Correct
Cables
When the POST has completed, check the Power On Self Test LED to
make sure that your Switch is operating correctly.
colors for the LED.
Table 6 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.
Off The Switch is not receiving power.
In addition, check the Unit LEDs on all Switches in the stack. If a Unit LED
is off, initialization is not complete. 3Com recommends that you do not
use the Switch's management interface until the Unit LED is green.
If there is evidence of a problem, see "Solving Problems Indicated by
LEDs" on page 54.
You can connect a SuperStack Advanced Redundant Power System
(3C16071, 3C16071A or 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 (part number
3C16078).
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.
CAUTION: The Switch can only use a SuperStack Advanced Redundant
Power System output.
All of the ports on the front of the Switch 4200 Family 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).
The Auto-MDIX feature only operates when auto-negotiation is enabled.
The Power-up Sequence
Table 6 shows possible
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