Item Name Icon Description1 Optional cableretention positions(4)— Locations for optional cable retention brackets.2 ExpansionEnclosure Modules(2)— Each EMM contains SAS ports and status indicators.3 Cooling fans (5) — Fans that provide cooling for the expansion enclosure.4 Power supply units(2)— 2.8 kW power supply that provides power for the expansionenclosure.5 Optional cableretention positions(4)— Locations for optional cable retention brackets.6 Power switch (2) — Controls power for the expansion enclosure. There is oneswitch for each power supply.SC180 Expansion Enclosure EMM Features and IndicatorsAn SC180 expansion enclosure includes two Enclosure Management Modules (EMMs) in two StorageBridge Bay (SBB) interface slots.Figure 3. SC180 EMM Features and IndicatorsItem Control/Feature Icon Description1 Fault LED • Off — Module OK• Amber — Module fault2 Power LED • Green (steady) — Module OK• Green (flashing) — Vital product data (VPD) fault• Off: Module fault3 Console port Not for customer use.4 SAS ports Connect to the storage system10 About the SC180 Expansion Enclosure