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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
MDI port
Normal or
MDI-X port
Rx
Tx
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.
Model EN104/EN108/EN116 Ethernet Hub Installation Guide
Straight-through
twisted pair cable
1
1
Tx
2
2
3
Rx
6
Crossover
twisted pair cable
MDI-X port
1
2
3
6
12345678
Normal or
MDI-X port
Rx
3
Tx
6
Normal or
1
Rx
2
3
Tx
6
8146EC
8
1
711EA
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