Parabola

Suppose \(\mathrm{AB}\) is a focal chord of the parabola \(y^2=12 x\) of length \(l\) and slope \(\mathrm{m}<\sqrt{3}\). If the distance of the chord \(\mathrm{AB}\) from the origin is \(\mathrm{d}\), then \(l \mathrm{~d}^2\) is equal to _________.