Allied Telesis SwitchBlade x3112 - Manual (Page 38)

Chapter 1: Overview
38
 You may use straight-through or crossover cables on ports that are
connected to network devices that support automatic MDIX
detection and that operate at 10 or 100 Mbps.
 You must use straight-through cables on ports that are connected
to network devices that have a fixed wiring configuration of MDI
and that operate at 10 or 100 Mbps.
 You must use crossover cables on ports that are connected to
network devices that have a fixed wiring configuration of MDIX and
that operate at 10 or 100 Mbps.
Port Pinouts
Refer to Table 40 on page 220 for the port pinouts of twisted-pair ports
that operate at 10 or 100 Mbps in the MDI configuration and Table 41 on
page 220 for the MDI-X configuration. For port pinouts when a twisted-pair
port operates at 1000 Mbps, refer to Table 42 on page 221.