The simulation of film grain in an image makes use of parameters contained in a Supplemental Enhancement Information message that accompanies the image upon transmission. % dihydrocarbyl higher polysulfides, and at least one phosphorus or boron compound, or mixtures of two or more thereof. The interface circuit is configured to transmit the error detection data covering the packet at an end of the packet, and is further configured to insert at least one partial error detection data within the packet. In addition, the cascaded optical amplifier includes a controller for providing control signals to the respective control inputs of the first amplifier and the second amplifier, the controller providing the control signal to the second optical amplifier as a function of the sensed signal. The second lock-member is fixed to the electronic device and includes a lock core and a guiding block extending from the lock core.