Siemens 2000592-001 User Manual

This section provides maintenance personnel with information on how to 
use the ANCB LEDs for troubleshooting the Advance Network 
Communications Board. 

 

Refer to Figure 4-2 for LED position and labeling. 

At power-up the top row of LED indicators will blink on briefly as the 
board passes its various power-up sequence tests. The ADHA green 
light indicates that the initial program parameters were successfully 
moved from FLASH to RAM memory. The ADHA yellow LED indicates 
that the board has passed its power-up RAM test, the ADHA red LED 
indicates that the board has passed its power-up FLASH integrity test, 
and the ADHB green LED indicates the board has begun its normal 
program execution. After approximately 5 seconds the indicators will go 
off depending upon the current board conditions. 

In normal board operation the ADHA LED’s are used to indicate the 
status of the Data Hiway channel and the DNETB LED’s indicate the 
status of the DataNET channel. In normal operation the ADHA green 
LED blinks to indicate either transmit or receive activity has occurred on 
the Data Hiway channel. The yellow LED will blink to indicate any 
transmit or receive errors that have occurred. 

The DNETB LED’s provide a link status indication for the DataNET 
channel. If the DataNET link is up and communicating the DNETB green 
LED will be lit. If the link is down or in the process of establishing a 
connection the DNETB red LED will be lit. 

If the ANG/DN board has a power-up failure or other catastrophic failure 
during normal operation the red Fault LED will light to indicate that a fault 
has occurred and the yellow LED will blink an error code, see Table 3-1 
Error Codes. 

 

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