Allied Telesis AT-FS202SC/FS4 - Manual (Page 15)

AT-FS20x and AT-FS202SC/FSx Series Installation Guide
5
Twisted Pair Port
The AT-FS20x and AT-FS202SC/FSx Series Switches have one 10/
100Base-TX twisted pair port. The twisted pair port features a RJ-45
connector.
Port Speed
The twisted pair port is compliant with the 10Base-T and 10Base-TX
standards and is capable of either 10 Mbps or 100 Mbps operation. You can set
the port speed manually or, since the port is IEEE 802.3u auto-negotiation
compliant, you can allow the switch to set the port speed automatically. With
auto-negotiation, the speed of the port is set automatically by the switch after
it determines the speed of the end-node connected to the port. Auto-
negotiation is designed to ensure that the port on the switch and the end-node
are operating at the same speed and that they are communicating at the
highest possible common speed of the devices.
Duplex Mode
Duplex mode refers to the way an end-node sends and receives data on the
network. An end-node can operate in either half- or full-duplex mode,
depending on its capabilities. An end-node that is operating in half-duplex
mode can either send data or receive data, but it cannot do both at the same
time. An end-node that is operating in full-duplex mode can send and receive
data simultaneously. The best network performance is achieved when an end-
node can operate at full-duplex, since the end-node is able to send and receive
data simultaneously.
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, the twisted pair port is set automatically to full-
duplex mode. If the end-node is capable of half-duplex, 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.