3Com 3C172203, 3C17204 manual Power/Self Test LED colors, Color State

24CHAPTER 2: INSTALLING THE SWITCH

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 “Solving Problems Indicated by

LEDs” on page 46.

Connecting a You can connect a SuperStack 3 Advanced Redundant Power System Redundant Power (3C16071B) to the Switch. This unit, which is also known as an RPS, is

System 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.

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.

Choosing the Correct All of the ports on the front of the Switch 4400 are Auto-MDIX, that is Cables 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.

If auto-negotiation is disabled, all the Switch ports are configured as MDIX (cross-over). If you want to make a connection to another MDIX port, you need an automatic cross-overcable. Many ports on workstations and servers are configured as MDI (straight-through). If you