The present invention teaches methods and systems for subscriber blocking of unauthorized network traffic in a cable data network. Several hierarchical algorithms are described which operate according to conditionally obtaining a patient response to an alert signal. An actuating mechanism is disposed at a predetermined distance from a lower portion of the insulator and includes a vertically movable center. 1 times the amount of the carboxyl groups. The matrix andor the sensor body are composed of materials which reduce or increase the density of light-scattering elements, depending on the conditions applied to the matrix. The bases of the isosceles trapezoids are parallel to the line segments of the bifilar helix.