AT-3624TR/3648TR Installation Manual - Allied Telesis
AT-3624TR/3648TR Installation Manual - Allied Telesis
AT-3624TR/3648TR Installation Manual - Allied Telesis
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<strong>AT</strong>-<strong>3624TR</strong> Connectivity<br />
RJ45 Connectors<br />
The <strong>AT</strong>-<strong>3624TR</strong> uses 24 RJ45 connectors. Figure 44 shows a sample RJ45<br />
connector.<br />
Pin 1<br />
Figure 44: RJ45 Connector<br />
MDI/MDI-X Switch<br />
The 24 10BASE-T RJ45 ports on the <strong>AT</strong>-<strong>3624TR</strong> are generally used for<br />
network connections between a hub and a transceiver. Network<br />
connections require a standard “straight-through” cable, meaning that a<br />
pin at one end connects to a pin with the same number at the other end.<br />
However, you may want to use one of these ports to link one hub to<br />
another hub. This type of connection requires the signal to “crossover,” so<br />
that the TX (transmit) pin at one end connects to the RX (receive) pin at<br />
the other end. You can accomplish this in either of two ways:<br />
❑<br />
❑<br />
You can use a special cross-over cable, available commercially at<br />
most electronic outlets.<br />
You can use a built-in MDI/MDI-X switch for internally crossing<br />
the signal over, before it is transmitted through the cable.<br />
<strong>AT</strong>I has incorporated an MDI/MDI-X switch into the <strong>AT</strong>-<strong>3624TR</strong> module<br />
(see Figure 45). The Medium Dependent Interface (MDI/MDI-X) switch at<br />
the upper left corner of the <strong>AT</strong>-<strong>3624TR</strong> front panel converts RJ45 Port 1<br />
from a normal network connector into an internally crossed-over port for<br />
hub-to-hub connection:<br />
❑<br />
❑<br />
The default setting for the switch is MDI-X (standard RJ45 port).<br />
If you want to use Port 1 to connect two hubs, you must set the<br />
switch on one, and only one, of the hubs to the MDI position.<br />
44