be9f0e83____22_57___Nguyễn_Thị_Bạch_Yến__1
[0] LOS (1, 2, 3, 4) [2] Always lights after starting up till synchronization is established. It also lights in case of E1 link interruption or signal loss in communication [1] 
E1 link interruption alarm
P o w e r
F l i c k e r s
l i g h t s
E 1 l i n k i n t e r r u p t i o n a l a r m
A l w a y s l i g h t s