IMC Networks McPC 100 Mbps Jumper Settings, AutoCross, Auto Negotiation on McPC 100Mbps

NOTE

The default for all features except Auto Negotiation is "Disabled."

Jumper Settings

Feature	Jumper		ON (pins)		OFF	Factory
	Position				(pins)	Default
JP2	TXLL	1-2		2-3		OFF
JP3	FXLL	1-2		2-3		OFF

AutoCross

The McPC 100Mbps includes AutoCross, a feature which automatically selects between a crossover workstation or a straight-through/repeater hub connection depending on the connected device.

Auto Negotiation on McPC 100Mbps

Auto Negotiation is available on the McPC 100Mbps. When Auto Negotiation is enabled, the 100Mbps negotiates as a 100 Mbps Full-Duplex device. When the device to which the McPC 100Mbps is connected can operate at 100Mbps Full- Duplex, a link will be established.

When the twisted pair port on the other device does not have the ability to Auto Negotiate, or when a 100 Mbps Half-Duplex connection is desired, Auto Negotiation on 100Mbps must be disabled. Half and Full-Duplex settings must be manually set and match on both devices to which the McPC 100Mbps is connected. The diagram below shows a typical application, followed by a table with three possible configurations.

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

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