AT-TS24TR Connectivity
54
RJ45 Connectors
The AT-TS24TR uses 24 RJ45 connectors, thus eliminating the need for a
Telco-type cabling adapter. Figure 51 shows a sample RJ45 connector.
MDI/MDI-X Switch
The 24 10BASE-T RJ45 ports on the AT-TS24TR are generally used for
network connections between the hub and a transceiver. Network
connections require a standard “straight-through” cable, meaning that a
pin at one end connects to a pin with the same number at the other end.
However, you may want to use one of these ports to link one hub to
another. This type of connection requires the signal to “crossover,” so that
the TX (transmit) pin at one end connects to the RX (receive) pin at the
other end. You can accomplish this in either of two ways:
❑
You can use a special cross-over cable, available commercially at
most electronic outlets; or...
❑
You can use a built-in method for internally crossing the signal
over, before it is transmitted through the cable
ATI has incorporated the latter feature into the AT-TS24TR module (see
Figure 52). The Medium Dependent Interface (MDI/MDI-X) switch at the
upper left corner of the AT-TS24TR front panel converts RJ45 Port 1 from
a normal network connector into an internally crossed-over port for hub-
to-hub connection:
❑
The default setting for the switch is MDI-X (standard RJ45 port).
❑
If you want to use Port 1 to connect two hubs, you must set the
switch on one, and only one, of the hubs to the MDI position.
Figure 51: RJ45 Connector
Pin 1
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