In methods and apparatus for routing packets through a communications network, a respective distinct broadcast address is assigned to each of a plurality of distinct sets of virtual ports. The apparatus can include a closure member to seal the container for substantially preventing loss of contents during movement of the sample carrier. The data management module is configured to determine selected operational data associated with the network appliance and to record the selected operational data in well-formatted data files. It is characterized in that phase information of the detected impact sound is processed by using the phase information of a signal other than the impact sound in the noisy signal so that an amount of change in the phase information is reduced. Ventilation means provide a flow of ventilation air inside a booth, perpendicular to the conveying axis. The soil nail walls are suitable for supporting an upright face of earth and comprise tensioned geosynthetic material held up against the face.