Moxa IMC-21A-M-SC Guia de Instalação descarregar pdf (Página 10)

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LFP: DIP switch is set to “DIS” mode

Device1

TP LED

DUTA TP

LNK LED

DUTA FO

LED

DUTB FO

LED

DUTB TP

LNK LED

Device 2

TP LED

TP1

Faulted

OFF

F1 Faulted

OFF

F2 Faulted

OFF

TP2

Faulted

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 cross-over 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.

Auto-Negotiation and Speed Sensing

The IMC-21A series’ RJ45 Ethernet port supports auto-negotiation 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.

Auto-negotiation takes place when an RJ45 cable connection is made, and

then 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.

DUTA

DUTB

TP1

TP2

Device1

Device2

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