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I observed that there are a total of 4 variants of 12-port WISP switches being listed for sale, i.e. WS-12-250B, WS-12-250A, WS-12-250-AC, WS-12-250-DC?

However, according to the data sheet, all the WS-12-250"X" variants take AC power input? & the only difference between the -A & -B variants are that the -A variants have more 48V & 48VH PoE ports?

Visually, I'd also observed that the -AC & -DC variants possess "thicker but shorter" enclosures?

What then are the other differences across these 4 variants?

Yes, there are differences in the number of VH ports for powering over all pairs.
The A and the B are rack mount.
The AC and the DC are small form factor.
The DC is DC powered.