A clock and data recovery device is disclosed that is capable of recovering a clock signal from a data signal that has a variable data rate. A coupling body surrounds the core element and is surrounded by a support body for attachment to the support structure. At least one historical profile is constructed for each entity in the subset of entities based on a set of possible outcomes of transaction behavior of each entity in the first subset of entities. The convexly curved surface may be the curved surface of a cylindrical quarter segment.