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AT-MC13 Media Converter Installation Guide

MDI/MDI-X Switch

An RJ-45 port on a 10 Mbps Ethernet network device can have one of two

possible wiring configurations: MDI or MDI-X. The RJ-45 port on a PC,

router or bridge is typically wired as MDI, while the twisted pair port on a

switch or hub is usually MDI-X.

To connect two 10 Mbps network devices together that have dissimilar

port wiring configurations, such as MDI to MDI-X, you use a straight-

through cable. To connect two network devices that have an RJ-45 port

with the same wiring configuration, such as MDI to MDI, you use a

crossover cable.

The RJ-45 port on the media converter features an MDI/MDI-X switch,

shown in Figure 4. You can use this switch to configure the twisted pair

port on the media converter as either MDI or MDI-X. This feature allows

you to use a straight-through cable regardless of the type of end-node

connected to the port.

Figure 4. MDI/MDI-X Switch

AT-MC13 ETHERNET MEDIA CONVERTER

NORMAL

LNK TST

10Base-FL 10Base-T

TX RX

MDI MDI-X

PWR

NORMAL

REC

LINK

REC

LINK

CLASS 1

LED PRODUCT

1203

MDI MDI-X

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Allied-telesis AT-MC13 Manual de usuario Pagina 17