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This chapter discusses how you can diagnose and fix errors quickly without having to 
contact a dealer or Lantronix. It helps to connect a terminal to the serial port while 
diagnosing an error to view summary messages that may display. When 
troubleshooting, always ensure that the physical connections (power cable, network 
cable, and serial cable) are secure.  
Note: Some unexplained errors might be caused by duplicate IP addresses on the 
network. Make sure that your unit's IP address is unique.  
When troubleshooting the following problems, make sure that the UDS2100 is 
powered up. Confirm that you are using a good network connection.  
LEDs 
The following LEDs are on the top of the UDS2100: 
 Power / Diagnostic (Blue)  
 RX Serial 1 Activity LED (Green) 
  TX Serial 1 Activity LED (Yellow) 
 RX Serial 2 Activity LED (Green) 
  TX Serial 2 Activity LED (Yellow) 
The following LEDs are on the RJ45 Ethernet connector: 
 Ethernet Link LED on the left (Bi-color, 10Mbps = Yellow, 100 Mbps = Green) 
 Ethernet Activities LED on the right (Bi-color, Half Duplex = Yellow, Full 
Duplex = Green) 
UDS2100 User Guide  67