User`s manual

76 •• Troubleshooting 2000591-001
ANCB LEDs Description and Operation
This section provides maintenance personnel with information on how to
use the ANCB LEDs for troubleshooting the Advance Network Gateway
(ANG_DN).
Refer to Figure 3-2 for LED position and labeling.
At power-up the top row of LED indicators will blink on briefly as the
board passes it’s 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 it’s power-up RAM test, the ADHA red LED
indicates that the board has passed it’s power-up FLASH integrity test,
and the ADHB green LED indicates the board has begun it’s normal pro-
gram 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 trans-
mit 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 con-
nection the DNETB red LED will be lit.
The ANG_DN uses the Ethernet 10Base2 port as a cross-link for inter-
board communications between the two data channels (A&B).
Whenever a communication failure is detected on the cross-link the
ADHB yellow and red LED’s are ON. If the communication link is working
properly the ADHB yellow and red LED’s are OFF.
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.
Description
Communications
Board LEDs
Power-UP
Normal Operation
Board Fault Indicators