Control for admitting microflows to a data network consisting of allocating logic priority levels to these microflows making it possible to implement a microflow preemption order based on this logic priority. In one embodiment, the serial bus comprises a universal serial bus. The F2F decoder can be integrated with the PICC data processor, and the AD converter can process analog data from both the magnetic head and the RF antenna circuit. In various embodiments, a SIT may be a component of a sensor insertion system configured for assembly by an end user, a health care professional, andor a caretaker prior to sensor insertion, and may act in cooperation with other sensor insertion system components.