Whether the USG2000&5000 support optional expansion cards

The USG2000/5000 supports multiple types of expansion interface cards, which provide powerful interface expansion capabilities in addition to abundant fixed interfaces. The support of expansion interface cards on models of various types are as follows:
-The USG2110-X does not support optional expansion cards.
-The USG2130 and USG2130W provide a MIC/DMIC slot, and the USG2160 and USG2160W provide two MIC slots or one DMIC slot. MIC and DMIC interface cards, excluding Wi-Fi interface cards, are optional. FIC and DFIC interface cards are not supported.
-The USG2210, USG2220, USG2230, USG2250, and USG2260 provide four MIC slots and two FIC slots. The USG2210E, USG2220E, USG2230E, and USG2250E provide four MIC slots and one FIC slot. MIC/DMIC and FIC/DFIC interface cards are optional.
-The USG5120 provides four MIC and 4 FIC slots, and MIC/DMIC and FIC/DFIC interface cards are optional.
-The USG5150/5160 provides four MIC and six FIC slots, and MIC/DMIC and FIC/DFIC interface cards are optional.
-The USG5520S/5530S supports two FIC interface card expansion slots. These two FIC slots can be combined into one DFIC interface card expansion slot.
-The USG5530 supports six FIC interface card expansion slots and two MIC interface card expansion slots. The six FIC interface card expansion slots can be combined into four DFIC interface card expansion slots, and two MIC interface card expansion slots can be combined into one DMIC interface card expansion slot.
-The USG5550/5560 supports five FIC interface card expansion slots and two MIC interface card expansion slots. The five FIC interface card expansion slots can be combined into three DFIC interface card expansion slots, and two MIC interface card expansion slots can be combined into one DMIC interface card expansion slot.

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