National Instruments NI UES-3880 manual LED Indicators, Auto MDI/MDI-X Connection

LED Indicators

The front panel of the NI Switch contains several LED indicators. The function of each LED is described in the table below.

LED	Color	State	Description
		On	Power is being supplied to power input
PWR1	AMBER		PWR1
		Off	Power is not being supplied to power
			input PWR1
		On	Power is being supplied to power input
PWR2	AMBER		PWR2
		Off	Power is not being supplied to power
			input PWR2
		On	When the corresponding PORT alarm is
			enabled, and the port’s link is inactive.
FAULT	RED		When the corresponding PORT alarm is
		Off	enabled and the port’s link is active, or
			when the corresponding PORT alarm is
			disabled.
		On	TP port’s 10 Mbps link is active
10M	GREEN	Blinking	Data is being transmitted at 10 Mbps
		Off	TP Port’s 10 Mbps link is inactive
		On	TP port’s 100 Mbps link is active
100M	GREEN	Blinking	Data is being transmitted at 100 Mbps
		Off	TP Port’s 100 Mbps link is inactive

Auto MDI/MDI-X Connection

The Auto MDI/MDI-X function allows users to connect the NI UES-3880’s 10/100BaseTX ports to any kind of Ethernet device, without needing to pay attention to the type of Ethernet cable being used for the connection. This means that you can use either a straight-throughcable or cross-overcable to connect the NI UES-3880 to Ethernet devices.

Dual Speed Functionality and Switching

The NI UES-3880’s 10/100 Mbps switched RJ45 port auto-negotiates with the connected device for the fastest data transmission rate supported by both devices. The NI UES-3880 is a plug-and-play devices, so that software configuration is not required at installation, or during 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.

Switching, Filtering, and Forwarding

Each time a packet arrives at one of the switched ports, a decision is made to either filter or forward the packet. Packets with source and destination addresses belonging to the same port segment will be filtered, constraining those packets to one port, and relieving the rest of the network from the need to process them. A packet with destination address on another port segment will be forwarded to the appropriate port, and will not be sent to the other ports

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