A system for regulating traffic in a computer network comprises a plurality of rate buckets associated with a network interface ingress port. The control circuit extracts amplitude values of the TE signal at tilt angles at predetermined angular intervals from the TE signal stored in the memory, and temporarily stores the extracted amplitude values in the memory, and further uses the stored amplitude values to determine a cubic curve to approximate the extracted amplitude values based on the least squares method. The panel is disposed at a lateral side of the circuit board and has a size adapted to the SCSI hole and being joined to an inner side of the SCSI hole.