A dispersion managed link for transmitting wavelength division multiplexed optical signals and method for providing the link are disclosed. This electret filter media may be used in a respiratory mask to provide extraordinarily good filtration properties. The positioned plurality of layers is secured to each other. The securing panel includes a base board and a flange. Also provided herein are vectors and host cells comprising those nucleic acid sequences, chimeric polypeptide molecules comprising the polypeptides of the present invention fused to heterologous polypeptide sequences, antibodies which bind to the polypeptides of the present invention and to methods for producing the polypeptides of the present invention.