Netgear WGT624 User Manual download pdf (Page 106)

Reference Manual for the 108 Mbps Wireless Firewall Router WGT624

B-14 Network, Routing, Firewall, and Basics

M-10153-01

Note: Flat “silver satin” telephone cable may have the same RJ-45 plug. However, using telephone

cable results in excessive collisions, causing the attached port to be partitioned or disconnected

from the network.

Uplink Switches, Crossover Cables, and MDI/MDIX Switching

In the wiring table above, the concept of transmit and receive are from the perspective of the PC,

which is wired as Media Dependant Interface (MDI). In this wiring, the PC transmits on pins 1 and

2. At the hub, the perspective is reversed, and the hub receives on pins 1 and 2. This wiring is

referred to as Media Dependant Interface - Crossover (MDI-X).

When connecting a PC to a PC, or a hub port to another hub port, the transmit pair must be

exchanged with the receive pair. This exchange is done by one of two mechanisms. Most hubs

provide an Uplink switch which will exchange the pairs on one port, allowing that port to be

connected to another hub using a normal Ethernet cable. The second method is to use a crossover

cable, which is a special cable in which the transmit and receive pairs are exchanged at one of the

two cable connectors. Crossover cables are often unmarked as such, and must be identified by

comparing the two connectors. Since the cable connectors are clear plastic, it is easy to place them

side by side and view the order of the wire colors on each. On a straight-through cable, the color

order will be the same on both connectors. On a crossover cable, the orange and blue pairs will be

exchanged from one connector to the other.

The WGT624 wireless router incorporates Auto Uplink

technology (also called MDI/MDIX).

Each LOCAL Ethernet port will automatically sense whether the Ethernet cable plugged into the

port should have a normal connection (e.g. connecting to a PC) or an uplink connection (e.g.

connecting to a router, switch, or hub). That port will then configure itself to the correct

configuration. This feature also eliminates the need to worry about crossover cables, as Auto

Uplink

will accommodate either type of cable to make the right connection.

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Netgear WGT624 User Manual Page 106