8
If unsure of how best to implement these features in a specific configuration, please
contact IMC Networks technical support at (800) 624-1070 (U.S./Canada), +32-16-
550880 (Europe) or via e-mail at:
Twisted Pair Crossover/Straight-Through Connections
iMcV-Modules support both crossover and straight-through CAT5 twisted pair cabling
types of connections by one of the following two methods:
AutoCross
iMcV-LIM Modules include AutoCross, a feature which
automatically selects between a crossover workstation or straight-
through/repeater hub connection depending on the connected
device.
MDI/MDI-X Switch
iMcV-PIMs feature a push button switch, located next to the RJ-45
connector, for selecting the type of connection. Select a straight-
through connection by pressing the push-button IN. The button
should be in the OUT position for a crossover connection. If unsure
of the type of connection, set the push button to a position that
makes the twisted pair LNK (link) LED glow.
Auto Negotiation on iMcV-LIM
iMcV-LIM Modules include the feature Auto Negotiation. When Auto Negotiation is
enabled, the module negotiates as a 100 Mbps Full-Duplex device; if the device the
iMcV-LIM is connected to can operate at 100 Mbps Full-Duplex, a link will be
established.
If the twisted pair port on the other device does not have the ability to
Auto Negotiate, or if a 100 Mbps Half-Duplex connection is desired, Auto
negotiation on iMcV-LIM must be disabled. Half- and Full-Duplex settings must be
manually set, and match, on both devices connected to the iMcV-LIM. The following
diagram shows a typical application, followed by a table with three possible
configurations.
HDX
HDX
OK (Manual Setting Only)
FDX
FDX
OK (Auto/Manual Setting Only)
FDX
HDX
WRONG
Switch
MediaConverter
Switch
MediaConverter
End to End Connection
Switch
McPC TX/FX
Half-Duplex
Manually Configure HDX
Auto Negotiation OFF
Full-Duplex
Manually Configure FDX
Auto Negotiation OFF
Full-Duplex
Auto negotiation ON
Auto Negotiation ON
