The D212 connects a wire based MVB segment to at least one, in maximum up to five OGF Optical Glass Fiber bus segments.

The transferred telegrams are refreshed with respect to their magnitude, jitter, frame timing and general plausibility.

It is designed for the harsh traction environment (-40 °C to +70 °C) and is fully compliant to the EN 50155/EN 50121-3-2:2006 standard.