NETGEAR FS102 Cable and Connector Information, Twisted Pair Cables, Straight-through, Crossover

Symptom	Cause	Solution
Yellow Rx/Tx	Data collision is	The port and switch might be functioning correctly.
Collision LED is	occurring on the port.	However, check the following to make sure that
blinking		excessive collisions are normal (as in most Ethernet
excessively.		networks) and not caused by:
		• Incorrect cabling or connectors
		• Wiring techniques
		• Mismatched duplex operating mode settings
Green FDX LED is	Port is operating in	Make sure the connected device is able to operate at
off when you have	half-duplex mode.	half-duplex mode and check the specifications of the
set the port to		connected device to make sure it has the ability to
operate in full-		signal the operating mode. Verify that the connected
duplex mode.		device is operational. If the connected device is an
		adapter card, make sure you have an adapter card
		that is capable of 100 Mbps operation and set to 100
		Mbps if it is not autosensing.

Cable and Connector Information

Twisted Pair Cables

For two devices to communicate, the transmitter of each device must be connected to the receiver of the other device. The crossover function is usually implemented internally as part of the circuitry in the device. Most ports on switches and repeaters have media-dependent interfaces with crossover ports. These ports are referred to as MDI-X or normal ports. Computer and workstation adapter cards are usually media-dependent interface ports referred to as MDI or uplink ports.

The figures illustrate the use of straight-through and crossover twisted pair cables.

Uplink or MDI port

1

Tx

2

Straight-through	Normal or
twisted pair cable	MDI-X port
	1
	Rx
	2

Rx

3

6

3	Tx
6

Normal or MDI-X port

Crossover	Normal or
	MDI-X port
twisted pair cable

Rx

1

2

1	Rx
2

Tx

3

6

3	Tx
6

8146EB

Model FS102, Model FS104, Model FS108 Fast Ethernt Switch Installation Guide