Allied Telesis AT-MC13 - Manual (Page 17)

AT-MC13 Media Converter Installation Guide
17
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