Nortel Networks OPTera Metro 3500 - Manual (Page 267)

Hardware feature descriptions 3-39
Planning and Ordering Guide—Part 1 of 2 NTRN10AN Rel 12.1 Standard Iss 1 Apr 2004
Figure 3-22
Left interface (LIF) (NTN451BA, NTN451BH)
EX0730p
Power
Critical alarm
Major alarm
Minor alarm
Remote
ACO
Service switch
ACO button