Embodiments of a method andor apparatus for a switch fabric in a data transport system are disclosed. Each interface is associated with at least one other interface of the group of interfaces and a group of network addresses. A method of screening anti-CMV drugs, a vaccine effective to diminish CMV infection, and a method of diminishing CMV infection are also disclosed. An inner surface of the braking sheet is formed with a plurality of recesses and a plurality of first textures for increasing friction force.