In one aspect, a disclosed method of processing a network packet received by an edge device from a client in a data processing network includes determining a priority category of the network packet when the priority category is indicative of a priority associated with the packet. The block is formed from concrete and has an uneven face to replicate layers of flat stone. In addition, the low voltage power electronics is distributed in a predefined space in the carrying case in such a way that a weight of the light weight x-ray head is counter weighed by a weight of the low voltage power electronics to stabilize the portable x-ray system when the light weight x-ray head is rotated in one or more directions. The dynamic bias circuit can include an error amplifier, the error amplifier generating the gain stage bias voltage responsive to the current source feedback voltage. The optical amplifier arrangement comprises an optical dividing device arranged to divide an optical input pulse into a plurality of non-overlapping pulses forming a pulse train,. Each of the crossing members interconnects a respective one of two diagonally aligned pairs of the first and second joints.