Auto MDI/MDI-X Connection
The Auto MDI/MDI-X function allows users to connect the Moxa
IMC-21GA’s 10/100/1000BaseT(X) ports to any kind of Ethernet device,
regardless of the type of Ethernet cable used for the connection. This
means that you can use either a straight-through cable or cross-over
cable to connect the IMC to Ethernet devices.
Auto-Negotiation and Speed Sensing
All of the IMC-21GA’s RJ45 Ethernet ports independently support
auto-negotiation for transmission speeds of 10 Mbps, 100 Mbps , and
1000 Mbps, with operation according to the IEEE 802.3u standard.
This means that some nodes could be operating at 10 Mbps, while at the
same time, other nodes are operating at 100 Mbps or 1000 Mbps.
Auto-negotiation takes place when an RJ45 cable connection is made, and
then each time a LINK is enabled. The IMC-21GA advertises its capability
for using 10 Mbps, 100 Mbps, or 1000 Mbps transmission speeds, with the
device at the other end of the cable expected to advertise similarly.
Depending on what type of device is connected, this will result in
agreement to operate at a speed of 10 Mbps, 100 Mbps, or 1000 Mbps.
If the IMC-21GA’s RJ45 Ethernet port is connected to a non-negotiating
device, it will default to 10 Mbps speed and half-duplex mode, as required
by the IEEE 802.3u standard.
Specifications
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