Verilink QPRI 2921 (880-503143-001) Product Manual - Manual (Page 81)

Troubleshooting
Verilink QPRI 2921 4-7
System LED The System LED displays node controller assignments and node
communication conditions.
Table 4-3 System LED Indicators
State Color Alarm Class Possible Error Condition
Solid Green None Module is okay and another module is the shelf controller.
Solid Red Critical System failure. You may need to reseat the card in the shelf.
Off None None Module is not on; no power.
Flashing Green None The module is acting as the controller (that is, it is the shelf
master controlling the ACP bus usage in the shelf).