A relay for use in a communications network, the relay being arranged receive data from and transmit data to at least one user equipment, wherein the relay includes a processor arranged to process received configuration data from the user equipment and to transmit data to the user equipment in dependence of the processed ranging data. As such, FER estimates may be generated for a channel of interest during discontinuous periods of that channel, or where the duty cycle of the channel is too low to support a desired FER estimation rate. The seal device engages and is interposed between the first and second sealing faces. The workpieces can be aligned within a holder to produce wafers using the device and methods presently provided. The handle is formed with a vertically disposed through hole so that the user can access the file and forcibly slidably remove the file to sharpen the scraper blade edge.