Siemens SCALANCE MM900 Series Compact Operating Instructions page 52

Technical data
7.4 Other properties
Device version (power supply)
MM991-2 (BFOC)
MM991-2 (SC)
MM991-2FM (BFOC)
MM992-2 (C) (SC)
MM991-2LD (BFOC)
MM991-2LD (SC)
MM992-2LD (LD)
MM991-2LH+ (SC)
MM992-2LH (SC)
MM992-2LH+ (SC)
MM992-2ELH (SC)
MM992-2SFP
These values apply at 40 °C
1)
You will find further information in the compact operating instructions "Transceiver SFP/SFP+".
2)
empty
3)
52
2)
MTBF
1)
> 140 years
> 135 years
> 115 years
> 105 years
> 95 years
> 250 years
3)
Compact Operating Instructions, 11/2019, A5E02630805-16
SCALANCE MM900