Mitel 3300 Technician's Handbook page 294

Technician's Handbook
Table 76. DSU PRI Card Circuit LEDs (continued)
Status
(Green)
Flashing
(Green)
Flashing
(Green)
270
LED
Color
Left Right
— ON Error.
(Red)
— OFF No error.
ON — D-channel established.
— Layer 1 established.
OFF — No link.
ON Alarm indication from far end.
(Yellow)
OFF ON Blue alarm from card (normal
(Yellow) during link startup).
Meaning (All LEDs)