An enterprise network router interface communicates with a public regional Autonomous System Border Router. The canopy can comprise a first panel and a second panel. An indicator is maintained corresponding to contiguously allocated empty elements in the plurality of elements. A tooth clearance is measured between the tooth surface and the sealing surface. The multiple access demodulator then separates the second multiple access signal according to the multiple access algorithm to obtain a plurality of first digital signals respectively corresponding to the first analog signals.