CTC Union EOe-1, User Manual

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Chapter 4. Test & Diagnostics
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Most Ethernet link problems occur when trying to connect
to older, legacy Ethernet equipment. Unless it can be confirmed
that the connecting equipment supports auto-negotiation or what
is sometimes referred to as "n-way" connections, it is
recommended to disable the auto-negotiation feature and
manually set the speed and duplex settings.
Almost all old 10Base-T equipment does not support Full
Duplex Ethernet, so it is quite safe to set all 10Base-T equipment
settings to Half Duplex. A wrong setting will result in extremely
poor performance on the LAN connection. Here it should be
noted that a good "link" indication does not necessarily mean the
duplex setting is correct.
Additionally, there is 100Base-TX equipment which also
does not support Full Duplex Ethernet. Equipment may not link
or the performance could be poor if the Ethernet is improperly
configured.
Auto MDIX may also cause some compatibility problems.
Some Ethernet chips will "fall asleep" or shutdown if they are
expecting an MDI device to connect with a crossover cable. If
this problem should arise, please try connecting the Ethernet with
a crossover cable.