The invention relates in particular to a computer system including peripheral devices and at least one switch connected to each device. A processor polls queues in a round robin fashion and schedules for transmission onto a link a packet in each queue with no deficit before scheduling for transmission onto the link a packet in each queue with a deficit. The communication network receives a real-time communication message from the first subscriber. An availability value for the wind energy installation is determined from the ratio of the actually produced amount of electrical energy to the total amount of energy which can potentially be produced. Vertical walls are formed at both ends of each cam. The cartridge housing includes a sheet outlet below the cleaning member for discharging a recording medium.