A system and method includes adjusting bit rate based on measured quality in a video conversion module. 1 to 10% Ag is dispersed in the matrix. The installed working and protection capacity of existing rings is viewed as a sunk investment, an existing resource, to be \u201cmined\u201d and incorporated into a mesh-operated network that serves both existing and ongoing growth. The shaft includes a rear portion adjoining the rear end and an expandable front portion adjoining the front end.