A catheter has an entrance opening defined by the first end of a catheter body and non-smooth inner surface. In some embodiments, a waveform that represents data samples is received. The optical imaging system further includes foreoptics, such as a telescope, optically coupled to the integrated dewar assembly and configured to direct and focus light from an entrance pupil of the optical imaging system into an optical beam incident on at least one of the plurality of focal plane array sensors. Later, if available resources are secured, the base station resumes the suspended call. 08 and that 390 \u03bcm\u2266TA\u2266750 \u03bcm, where WA is the weight of the positive electrode layer, WB is the weight of the negative electrode layer, and TA is the thickness of the positive electrode in which the positive electrode layer is formed. An adaptive learning unit for adaptively learning a boost characteristic of the active filter on the basis of an input and an output of the waveform equalizer so that error in the waveform equalizer is minimized.