A laminate sheet material comprising a first layer comprised of polymeric material and a second layer comprised of non-metallic fibers. The method includes transmitting a block comprising one or more data frames to a terminal, receiving an acknowledgement of receipt of the block from the terminal, and retransmitting a block comprising data frames that have not yet been received by the terminal to the terminal by referencing the acknowledgement of receipt. Then the communication device transmits a beacon of a second type comprising an identifier of the communication device and the chosen beacon slot for the transmission of the beacon of the first type, the beacon of the second type being transmitted in the contention period. Two shielding brackets are provided as the shield support and connected to one another in a releasable manner.