Figure 2 - Optispeed System Architecture (Model Lvd 419 Shown, Similar To 385, 503, 608, 658, 704, And 900 Models); Figure 3 - Optispeed System Architecture (Model Lvd 419 Shown, Similar To 385, 503, 608, 658, 704, And 900 Models) - York VSD 292 Series Operation Manual