3Com 3C16987A, 3C16988A, 3C16986A, 3C16985B manual Choosing

		Choosing the Correct Cables 33
	Table 5	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 34.
Choosing the	All of the ports on the front of the Switch 3300 XM, SM, TM and MM are
Correct Cables	configured as MDIX (cross-over). If you want to make a connection to
	another MDIX port, you need a cross-overcable. Most of the 10BASE-T
	and 100BASE-TX ports on 3Com devices are MDIX-only. Many ports on

workstations and servers are configured as MDI (straight-through). If you want to make a connection to an MDI port, you need to use a standard straight-throughcable. This is illustrated in Figure 14.

Figure 14 Connecting other devices to the Switch