Intel 410T quick start Testing a cable, Straight-through UTP cable, Crossover UTP cable

Testing a cable

A quick way to check a cable’s link integrity is to plug one end into port 1 and the other end into port 2. Make sure the MDI/MDI-X button is out. Check the Activity LEDs for ports 1 and 2. If the LEDs are on, you have a functioning crossover cable.

If the LEDs are off, push the MDI/MDI-X button in. If the Activity LEDs for ports 1 and 2 turn on, you have a functioning straight-through cable. However, if the LEDs remain off, you probably have a defective cable.

If a cable passes these tests, but the network connection is slow, verify that wires 1, 2 and 3, 6 on the cable are twisted pairs as shown in the diagrams.

Straight-through UTP cable

Hub (MDI-X)		Adapter (MDI)
	BA9BAA

1	(RX+)	1	(TX+)
2	(RX-)	2	(TX-)
3	(TX+)	3	(RX+)
6	(TX-)	6	(RX-)
4 Not used		4 Not used
5 Not used		5 Not used
7 Not used		7 Not used
8 Not used		8 Not used

Crossover UTP cable

Hub (MDI-X)			Switch (MDI-X)
	BA9BAA
1		(RX+)	1		(RX+)
2		(RX-)	2		(RX-)
3		(TX+)	3		(TX+)
6		(TX-)	6		(TX-)
	4 Not used			4 Not used
	5 Not used			5 Not used
	7 Not used			7 Not used
	8 Not used			8 Not used

24