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Black Box Sm265A 2 Unit Ab Switch CardPick a card, any card. AB Switch cards are available for RS-232, video, fiber optic, and cAT5ecAT6 connections. The card featured here is the DB25RS-232. Use the system for both new and legacy applications. You can add cards for fast cAT6 10-gbE networking while keeping connections for older RS-232 and 75-ohm v..