An intravascular port access device includes a first component having a chamber configured to attach reversibly to an intravenous line port. The cylindrical pressure bearing element is sufficiently rigid so as to maintain its shape during the introducing of the granular ceramic material. The precipitate which originally forms during hydrolysis is left to mature until the zinc oxide has completely flocculated. Based on this recharacterization, the invention divides the processing of the deterministic data flow for a communication signal among several Class processors that are separately configurable to optimize their particular categoryclass of computation in the asynchronous processing of the signal. The quantity entry columns may be used to specify next traded quantities that may be used in placing orders for tradeable objects. Adaptation using derivatives for FIR filters is known, but this technique was not available for IIR filters because of the unavailability of the derivative values.