A switch fabric system comprises a first chassis for receiving a plurality of line cards each having a plurality of ports and at least two switch fabric cards wherein each line card comprises a plurality of link ports for linking the line card with the switch fabric card. The apparatus comprises carriers by means of which the packaging containers may be pushed from a first position to a second position in relation to said cassettes. The bond provides at least one electrical pathway between the first electronic element and the second electronic element through an elongated contact region. To cover a wide area, the limited field of view is swept across the area of coverage. Clock multipliersdividers may be used between the various sections to derive their clocks from a single source, such as the IO clock.