System Status LEDs, Continued

Ethernet Port LEDs

Cross Link Status

LED

There are four Ethernet Link Status LEDs.

 

Link Active

LED is Green (on) when a link is established success-

 

 

fully between the Ethernet port and associated Ethernet

 

 

Hub or repeater.

 

 

If LED is OFF check for a bad cable, faulty wiring, or

 

 

loose connections.

 

 

 

 

 

Rx

Rx LED blinks when there is data reception on the

 

 

Ethernet port.

 

 

 

 

 

Tx

Tx LED blinks when the Ethernet port transmits a mes-

 

 

sage.

 

 

 

 

 

Collision

Collision LED blinks when there is a collision on the

 

 

Ethernet link. A collision is a normal event on an

 

 

Ethernet link and occurs when both sides of the link

 

 

attempt to transmit at the same time. Excessive colli-

 

 

sions indicate a problem with the network.

 

 

Could be a cabling problem or bad network interface

 

 

board.

 

 

 

 

 

 

 

 

The cross link status LED is red when no link is established between the two DataNET Hub halves, and is green when a connection is detected. Usually a red indication is caused by the absence of the cross link cable or a faulty connection.

64 Data Communications Setup

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Siemens DataNET Hub (DNH) user manual Ethernet Port LEDs Cross Link Status, Led