A method of making aluminum oxynitride includes introducing a mixture having aluminum oxide and carbon into a chamber, agitating the mixture within the chamber, and heating the mixture to make aluminum oxynitride. The method may also include compressing the gas prior to expanding it. A cover extends around the retainer and includes at least one opening formed through the cover to facilitate engaging the retainer with a tool. The present invention provides a telecommunications transmission system using zipper and having at least two VDSL systems. The rear end of the actuating link is movably connected to the mounting arm.