The static connections are shown in Fig. 9 as dashed lines. SCF is performed
after the BS process. The scheduler first broadcasts
the BS matching result of IMs andOMs to every IM. Then, following
the static connections, each unmatched IM can send a
cell to each unmatched OM if the corresponding VOMQs do
not have a batch because these cells are still in the cell cache and
they can be read out through the northbound output ports.