An aspect of the invention provides an endless belt in which a ten-point mean roughness of a surface of the endless belt is measured with scanning probe and is in a range from not less than 2. The plurality of clocks, which may be located at different components of the medical device system, comprises a first clock and a second clock. The monitoring may include detecting partially-completed connection transactions initiated by an access requestor, measuring the period of time that a partially-completed connection transaction remains in existence, comparing the period of time with the threshold period of time, and resetting a communication port located on the access provider. If the data set is generated by the verifier and transmitted to the prover, then this method can serve for the identification of the prover.