A system and method allows devices to send and receive packets while using power to do so in a manner that responds to events, such as receipt or other identification of different parameters that control how packets are sent and received. The priority value is calculated based on at least one service quality parameter attributed to the data transmission flow, and upon a network feedback parameter indicative of the state of congestion within the packet network. The side wall spacer conformingly covers the side wall of the gate electrode and the surface of the low concentration region in the drain region. The invention is applicable to wavelength division multiplexed transmission systems, and makes it possible to limit non-linear effects, such as four-wave mixing, and to limit the use of dispersion-compensating fiber. 5 MPa<E<300 MPa at 160-200\xb0 C.