Allied Telesis AT-IE300-12GP Installation Manual page 77

not support the feature. On those ports, you should disable
automatic MDIX detection and set the wiring configuration
manually with the POLARITY command.
The appropriate MDI/MDI-X setting for a switch port connected to a

10/100Base-T network device with a fixed wiring configuration
depends on the setting of the network device and whether the
switch and network device are connected with straight-through or
crossover cable. If you are using straight-through twisted pair
cable, the wiring configurations of a port on the switch and a port
on a network device must be opposite each other, such that one
port uses MDI and the other MDI-X. For example, if a network
device has a fixed wiring configuration of MDI, you must disable
auto-MDI/ MDI-X on the corresponding switch port and manually
set it to MDI-X. If you are using crossover twisted pair cable, the
wiring configurations of a port on the switch and a port on a
network device must be the same.
Ethernet cables that are connected to outdoor equipment, such as

CCTVs mounted on poles, might be subjected to surges from
lightning or power cross events. Properly rated primary protection
devices must be installed on the cables before connecting them to
the switch.
IE300 Series Installation Guide
77