A virtual broadband transmitting unit includes a stream generator to generate a multiplicity of data streams from an incoming media data stream, and a transmission manager to control the upload of the multiplicity of data streams along a multiplicity of transmission channels to at least one wireless communication network. The amorphous silicon layer may be formed to a uniform thickness without a thinning defect. Also provided by the invention are tissue cultures of the soybean variety D4789254 and the plants regenerated therefrom. The annular sleeve includes an inner portion and an outer portion.