NETGEAR EN108, EN116 manual Cable and Connector Information, Network Interface Cards, Hub Integrity

Network Interface Cards

Make sure the network interface cards installed in the workstations are in working condition and the software driver has been installed.

Hub Integrity

If required, verify the integrity of the hub by resetting it. Turn power to the switch off and then back on. If the problem continues and you have completed all the preceding diagnoses, contact NETGEAR Customer Support. For the phone number of the representative in your area, see “Customer Support.”

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	Straight-through
	twisted pair cable
MDI port
1
Tx
2
3
Rx
6
Normal or	Crossover

MDI-X port twisted pair cable

1

Rx

Normal or MDI-X port

1

Rx

2

3

Tx

6

Normal or MDI-X port

1

Rx

Tx

2

3

6

2

3

6Tx

8146EC

RJ-45 Connector

The RJ-45 connector (shown in the illustration with an RJ-45 plug) is used to connect workstations, hubs, and switches through unshielded twisted pair cable. The RJ-45 connector accepts four-pair Category 3 or Category 5 UTP cable. Only two pairs are used for 10BASE-T wiring.

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Model EN104/EN108/EN116 Ethernet Hub Installation Guide