This object reports the maximum number of PBT transit interfaces the chassis supports, i.e., interfaces used for tunnels that pass through this chassis without originating or terminating there. An admin uses this when the chassis serves as a mid-path transit node for PBT traffic between other chassis in the network. For example, a chassis positioned in the core of a PBT-based metro network relies on transit interface capacity, tracked here, to pass through traffic for services that neither start nor end on this box.