IBM AT-FS202SC/FS3 - Manual (Page 14)

Description
6
The twisted-pair port on the switch can operated in either half- or full-duplex
mode. You can set the duplex mode manually or allow the switch to set it
automatically through Auto-Negotiation. With Auto-Negotiation, if the end-
node is capable of full-duplex mode, the twisted-pair port is set automatically
to full-duplex mode. If the end-node is capable of half-duplex mode, the port is
set automatically to half-duplex mode.
Auto MDI/MDI-X
An RJ-45 twisted-pair 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.
To connect two 10 Mbps or 100 Mbps network devices together that have
dissimilar port wiring configurations, such as MDI to MDI-X, use a straight-
through twisted-pair cable. To connect two network devices that have the
same wiring configuration, such as MDI to MDI, use a crossover cable.
The AT-FS20x switches feature automatic MDI/MDI-X. The RJ-45 port
automatically determines the configuration of the port on the device to which
it is connected and then configures itself appropriately. For example, if a port
on a switch is connected to a port on a bridge, which is typically wired as MDI,
the port on the switch automatically configures itself as MDI-X. This feature
allows you to use either crossover cables or straight-through cables when
connecting a device to the twisted-pair port.
Fiber Optic Port
The AT-FS20x switches have one 100Base-FX fiber optic port. The fiber optic
port features either an SC or ST connector.
Port Speed
The fiber optic port is compliant with the 100Base-FX standard and has a
fixed operating speed of 100 Mbps. The end-node connected to the fiber optic
port on the switch must also be able to operate at 100 Mbps.
Duplex Mode
The fiber optic port on the switch can operate in half- or full-duplex mode. You
must set the duplex mode manually using the DIP switches on the back of the
unit.