3Com 3C16987 Choosing, Correct Cables, Port, you need a cross-overcable. Most of the 10BASE-T

30CHAPTER 2: INSTALLING THE SWITCH

	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 31.
Choosing the	All of the ports on the front of the Switch 3300 SM are configured as
Correct Cables	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 10.

Figure 10 Connecting other devices to the Switch 3300 SM

1x

13x

6x 7x

18x 19x

12x

24x

			10BASE-T / 100BASE-TX										1000BASE-SX
					green = enabled, link OK
		flashing green = disabled, link OK
1	2	3		4	5	6	7	8	9	10	11	12	Packet
1	2	3		4	5	6	7	8	9	10	11	12	Status
13	14	15		16	17	18 19		20	21 22		23	24	Packet
13	14	15		16	17	18 19		20	21 22		23	24	Status

Unit

1	2
3	4
5	6	Power/Self Test	®
7	8		SuperStack II

Switch 3300 SM

MDIX (Cross-over) Cable

MDI (Straight-through) Cable

Hub Workstation

Switch

Server