Top Page > Main Chapters > Installation > USB Device Server Option Type M19 (D3BC-28, 29) > Installation Procedure > What Do the LED Indicators Mean?
When this option is properly installed and recognized by the main machine, the LED indicators light up under the following conditions.

No. |
LED Color |
Lights Up When: |
1 |
Green and Yellow |
1000BASE-T operates. |
2 |
Green |
10BASE-T operates. |
3 |
Yellow |
100BASE-TX operates. |