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WH29BT019D1S01 is a 2x2 (four-port) Cage+Connector, while WH29AT019D1S01 is 2x1.Both are stacked SFP+ assemblies with the same materials; WH29BT019D1S01 simply adds a second column for a total width of about 29.00 mm.
Yes. Each column carries a ▽△▽△ set of clear polycarbonate lightpipes between its upper and lower ports.That gives two sets in total, each with inner and outer pipes.
The recommended PCB thickness is 2.36 mm (.093 in), with 1.57 mm as the minimum.Each bezel opening is 29.80 mm × 26.00 mm, with a minimum center spacing of 31.52 mm between columns. The cage is 0.25 mm copper alloy, nickel plated at 30 µin minimum.