In some embodiments, a system includes a power system coupled to a power bus, and a power line communication gateway coupled in series with the power bus. The connector includes a terminal connected to an end of an electric wire and a housing receiving the terminal. The cell transmitting device measures the input rate of cells to be transmitted on the connection, determines an allowable cell rate on the basis of the input rate and cell rate information supplied by the cell receiving apparatus, and transmits cells within the allowable cell rate. The first bracket has a brace located adjacent the window and a stop located adjacent the wall.