A connector includes a housing having a mating face configured to join a mating connector. Detecting such a blocking situation enables it to be overcome, and enables the communication session to proceed. Several embodiments of microwave antennas are disclosed that comprise an additional diagnostic or therapeutic modality located on or in the vicinity of the microwave antennas. Cache data storage is operated by a data consumer. According to one aspect of the present invention, the invention includes a core sequence of symbols, a successive repetition of the core sequence, and a marker sequence having a sequence of symbols different from the core sequence.