User's Manual

AT-TQ2450 Installation Guide
23
Automatic MDIX
Detection
The 10/100/1000 Mbps twisted-pair port is IEEE 802.3ab compliant and
features automatic MDIX detection when operating at 10 or 100 Mbps.
(Automatic MDIX detection does not apply to 1000 Mbps.) This feature
automatically configures the port to MDI or MDI-X depending on the wiring
configuration of the port on the Ethernet switch.
You may not disable automatic MDIX detection. For automatic MDIX
detection to work properly, it must also be present on the Ethernet switch.
The LAN port defaults to MDIX if it is connected to a network device that
does not support automatic MDIX detection.
Port Pinouts Refer to Table 11 on page 55 for the port pinouts of the LAN port when it is
operating at 10 or 100 Mbps in the MDI configuration and Table 12 on
page 55 for the MDI-X configuration. Refer to Table 13 on page 56 for the
port pinouts when the port is operating at 1000 Mbps.
Table 2. Twisted Pair Cable for the LAN Port
Cable Type
10Mbps 100Mbps 1000Mbps
Non-
PoE
PoE
Non-
PoE
PoE
Non-
PoE
PoE
Standard TIA/EIA 568-
B-compliant Category 3
shielded or unshielded
cabling with 100 ohm
impedance and a
frequency of 16 MHz.
Yes No Yes No No No
Standard TIA/EIA 568-
A-compliant Category 5
shielded or unshielded
cabling with 100 ohm
impedance and a
frequency of 100 MHz.
Yes Yes Yes Yes Yes No
Standard TIA/EIA 568-
B-compliant Enhanced
Category 5 (Cat 5e)
shielded or unshielded
cabling with 100 ohm
impedance and a
frequency of 100 MHz.
Yes Yes Yes Yes Yes Yes
Standard TIA/EIA 568-
B-compliant Category 6
or 6a shielded cabling.
Yes Yes Yes Yes Yes Yes
Review Draft - March 18, 2012