Moxa IMC-21A-S-SC [10/12] Auto mdi mdi x connection
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Moxa IMC-21A-S-SC [10/12] Auto mdi mdi x connection

Moxa IMC-21A-M-ST [10/12] Auto mdi mdi x connection
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LFP: DIP switch is set to “DIS” mode
Device 1
TP LED
DUTA TP
LNK LED
DUTA FO
LED
DUTB FO
LED
DUTB TP
LNK LED
Device 2
TP LED
TP1
Faulted
OFF OFF ON ON ON ON
F1 Faulted
ON
ON
OFF
OFF
ON
ON
F2 Faulted
ON
ON
OFF
OFF
ON
ON
TP2
Faulted
ON ON ON ON OFF OFF
Auto MDI/MDI-X Connection
The Auto MDI/MDI-X function allows users to connect the Moxa IMC’s
10/100BaseT(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 crossover cable to connect the IMC
to Ethernet devices.
Dual Speed Functionality and Switching
The Moxa IMC’s 10/100 Mbps switched RJ45 port auto negotiates with the
connected device for the fastest data transmission rate supported by both
devices. All models of Moxa IMC are plug-and-play devices, so that
software configuration is not required during installation or maintenance.
The half-/full-duplex mode for the switched RJ45 ports is user dependent
and changes (by auto-negotiation) to full- or half-duplex, depending on
which transmission speed is supported by the attached device.
Autonegotiation and Speed Sensing
The IMC-21A series’ RJ45 Ethernet port supports autonegotiation in
10BaseT and 100BaseT(X) modes, with operation governed by 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.
Autonegotiation takes place when an RJ45 cable connection is made;
each time a LINK is enabled. The Moxa IMC advertises its capability for
using either 10 Mbps or 100 Mbps transmission speeds, with the device at
the other end of the cable expected to advertise similarly. Depending on
which type of device is connected, the devices will agree to operate at
either 10 Mbps or 100 Mbps.
If a Moxa IMC’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.
F1
DUTA
DUTB
TP1
TP2
Device1
Device2

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