Siemens DataNET Hub (DNH) - Manual (Page 72)

64 • Data Communications Setup 2000585-001
System Status LEDs, Continued
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.
Ethernet Port LEDs
Cross Link Status
LED