Allied Telesis AT-PBC18 - Manual (Page 45)

PowerBlade PBC18 Installation Guide
45
Common Features
The following is a list of features common to most PowerBlade Media
Converter modules:
❑ LEDs for unit and port status
❑ MDI/MDI-X feature that eliminates the need for a crossover cable
(except for the AT-PB1000 Series)
❑ Link Test feature performs a link test on the module’s port
❑ MissingLink™ notifies end-nodes of link failures
❑ Half-duplex or full-duplex operation
MDI/MDI-X
An RJ-45 port on a 10 Mbps or 100 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.
Note
This feature is available for all PowerBlade modules except for the
AT-PB1000 Series.
To connect two 10 Mbps or 100 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 PowerBlade 10 Mbps and 100 Mbps media converters that have an
RJ-45 port feature an MDI/MDI-X button. You can use this button to
configure the twisted pair port on the media converter as either MDI or
MDI-X, thus eliminating the need for a crossover cable regardless of the
type of network device you are connecting to the unit.