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TESTING AND TROUBLESHOOTING

4-6

LNK (Green)

When this LED is lit, it indicates an established link between the

associated twisted pair segment and the 10BASE-T device at the other

end of the segment. This LED will remain lit as long as a link is

maintained

If a port receives no data for 16 msec from the device at the other end

of the segment, a positive link test pulse of 100 nsec is sent onto the

transmit link of the twisted pair cable. The MRXI receives these link

test pulses and checks to determine if they occur at the correct rate,

polarity, and pulse shape. If the MRXI receives no link test pulses, or

the pulses are not correct, the transceiver enters the Link Fail State and

the LED will not be lit. The MRXI does not receive or transmit data

until it receives a correct link test pulse or a valid packet.

When the MRXI is powered-on, the LNK LED flashes if the MRXI

detects reversed polarity on the segment attached to the associated

port.

CPU (Flashing Green)

This LED alternates from red to green during power up. After the boot

is complete, the LED flashes green. A flashing green LED indicates

normal operation. A red LED indicates a faulty processor.

4.4 THE LCD DISPLAY

The MRXI is equipped with an LCD display as shown in Figure 4-3. The

LCD display is a diagnostic tool that gives you important status

information about the MRXI such as: Power up diagnostics, Revision

levels, MAC and IP Addresses, and Error Alerts.

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Cabletron Systems EPIM F3 Guía de usuario Pagina 50