A technique is disclosed for facilitating communications between a network node and a Head End of an access network. Fasteners and elements provide spaced apart, axially tapered outer surfaces proximate a vertical side of the rail with the tapers narrowing toward the side of the rail. The auxiliary mounting unit is supported by the paper mounting unit, and includes an auxiliary mounting surface that is deployed from the paper mounting unit and which serves to extend the mounting surface. The step registers determine if the snoop unit will operate by proceeding in a normal execution mode, or operate in a single-step mode. The various kinds of crushed pieces included in the shredder dust are charged by the discharge, the polarity of the crushed pieces being opposite to that of the rotating drum. , a set value of a developing bias voltage.