a communication port is susceptible to contaminates such as dirt , dust , and moisture if not properly protected . a communication port that automatically protects against contaminates includes a housing defining an opening and configured to receive a device connector . a face plate is disposed on the housing . the face plate defines a window generally aligned with the opening . a door is slideably disposed on the housing and biased toward a position covering the opening and the window . exerting a force on the door exposes the opening and the window .